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Old 11-28-2016, 10:08 AM   #1
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35 inch tires and 3.21 gear ratio

Is it bad that I'm running 35 inch tires with a 3.5 lift and a 3.21 gear ratio? I have this vehicle for daily driving only, no off road. I'm okay with how it drives. Just wondering, is it bad for the Jeep, like the engine or anything?

I heard someone say it's bad for the transmission and it will burn out due to premature failure because it needs to "hunt" for gears. Not sure if that's true.

My thoughts were to regear to 4.88 because I want to go 37 inch tires in the future but not sure yet. I also heard if I go with 4.88, I will be driving at higher RPMs and that the engine will work harder than it should. Is 4.88 gear ratio good or should I just go with a 4.56?

These are all that I found and read online and I just wanted some clarification.

Edit: I have a 4 door 2015 sport automatic
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Old 11-28-2016, 10:12 AM   #2
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What's the point of 37s if you never offroad?

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Old 11-28-2016, 10:24 AM   #3
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I ended up going with a 3.5" metal cloak game changer with adjustable control arms and track bars. I have stock bumpers, steps, 3.21 gears, D30, D44 auto. If you are used to driving around with 3.21 gears on the stock 32" Sahara tires, the 35's aren't that much worse. yeah it's still a little sluggish. Maybe the superchips flash pack helped a little. I actually put off my gear upgrade until next spring because it wasn't as bad as I thought it was going to be. When I do the gear swap which I plan on doing myself. With the $1000 in labor that I save, I plan on replacing both driveshafts. I plan on running the Dana 30 on the front until it breaks or I can find a used Rubicon Dana 44 front axle somewhere for a reasonable price.
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Old 11-28-2016, 10:27 AM   #4
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I just drove 2k miles on 315/75R16 General Grabbers with an auto and 3.21s. I adjusted with a procal. On flat long straightaways I was fine, mountains got a little annoying. It's definitely sluggish. Mileage dropped like a rock but I'm driving a brick on wheels and didn't buy it for mileage.
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Old 11-28-2016, 10:42 AM   #5
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Thanks for everyone's response! I'm wondering, is it bad for the Jeep in any way? Like the engine or any other thing that I mentioned above?
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Old 11-28-2016, 10:54 AM   #6
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Yes it will wear things faster and put more stress on them. Think about it: the system is designed for stock size tires (and 3.21 is undergeared even for that unless you got the 29 inch tires). You put much larger, wider, heavier tires on it. It isn't just a matter of "well it moves and I am OK with it". You should properly gear before running big tires - even if just a pavement driver. Why do big tires THEN ask the question?
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Old 11-28-2016, 10:56 AM   #7
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@Dirty BOY is thinking about running 35" tires with his 3.21 gears. The 1 good thing he has going for him is being in flat South Florida, so hills and mountains aren't really a big deal.
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Old 11-28-2016, 10:58 AM   #8
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Quote:
Originally Posted by wranglerguy23 View Post
Is it bad that I'm running 35 inch tires with a 3.5 lift and a 3.21 gear ratio? I have this vehicle for daily driving only, no off road. I'm okay with how it drives. Just wondering, is it bad for the Jeep, like the engine or anything?

I heard someone say it's bad for the transmission and it will burn out due to premature failure because it needs to "hunt" for gears. Not sure if that's true.

My thoughts were to regear to 4.88 because I want to go 37 inch tires in the future but not sure yet. I also heard if I go with 4.88, I will be driving at higher RPMs and that the engine will work harder than it should. Is 4.88 gear ratio good or should I just go with a 4.56?

These are all that I found and read online and I just wanted some clarification.

Edit: I have a 4 door 2015 sport automatic

You answered your own question. If you're fine with how it drives then what's the prob bob?

In fact that's a good combo for mall crawling to light off road use.
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Old 11-28-2016, 11:01 AM   #9
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for those who want to know why run 37's if you are not going offroad, I would say the answer is for looks. 37's look great. As far as wear and tear I would suggest there is not way of knowing how bad it will be say stock you can go 200,000 miles without an issue with 37's you might go 180,000 or 220,000 miles without issue no way of knowing. Most people will know soon enough if they need to regear.
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Old 11-28-2016, 11:30 AM   #10
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Ive been like this over a year. It is slow. Crawl speeds way too high let the clutch out in first and youre doing 10mph.

I wish i had bought a rubicon and 4.10s then it would be fine!

It works but i run 5th up to 75 then use sixth. At 65 i can NOT hold it on the flat in 6th any hill at all i have to drop to 4th!!
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Old 11-28-2016, 12:20 PM   #11
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Originally Posted by jadmt View Post
for those who want to know why run 37's if you are not going offroad, I would say the answer is for looks. 37's look great. As far as wear and tear I would suggest there is not way of knowing how bad it will be say stock you can go 200,000 miles without an issue with 37's you might go 180,000 or 220,000 miles without issue no way of knowing. Most people will know soon enough if they need to regear.
Wow, this is the best response. No wonder you're a moderator.
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Old 11-28-2016, 02:15 PM   #12
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I don't get the whole spend-a-fortune-to-look-cool thing, but it's not my money, and I'm not that cool. For that matter, I'm not happy with 4.10's and 35's, much less 3.21s. Again, to each his own.

As to damage, I'm not sure what "things will wear faster" with larger tires and taller gears. Your torque converter will spend more time unlocked, particularly in traffic. That doesn't hurt anything, but it does build heat, which is tough on transmissions, as a rule. Your Sport doesn't have a transmission temp gauge, so unless you add one you'll never know if it's getting hot, so why worry about it? Yours will likely run a few degrees hotter than a one in a properly geared vehicle, which is nothing. I don't see a downside for the other components. You're running the motor lower in the RPM band than optimal, but if that hasn't bugged you yet, it isn't going to. You're certainly not "lugging it", unless Jeep used a really low stall speed converter in the JK, which I don't think is the case. You can watch the tach and see if that's happening.

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Old 11-28-2016, 02:51 PM   #13
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@Dirty BOY is thinking about running 35" tires with his 3.21 gears. The 1 good thing he has going for him is being in flat South Florida, so hills and mountains aren't really a big deal.
Yep, installing next week. TOYO OC R?/T.

Talked with a few people around here and at my gym running the same of 3.73 about it. Most had no idea what I was talking about and only had 35's from the dealers. They said they "guess" when its a steep highway ramp it's a little slow, but they are jeeps."

Talked to a another guy on 35x12.5 with same year Sahara and said he was fine and same thin. A little slow off the line and will get RPM's a little higher when trying to get a quick start.

Now before my lift, 275/70/18 feet normal like the Stock which I guess already comes under geared from FCA. Really? they will sell me a new vehicle, under great that will be tressed and honor 5yr warranty? Oh, my 7 yr BtoB?

After the lift I felt a little sluggish getting on the highway via a steep ramp. Can feel the winds more as well. But its keeping me from speeding and traffic tickets as well. Safer driving with kids in the car too, so win there.

Now yesterday I was able to CHRIP my tires when gunning it. Yes, got a big chirp/screech out my 275/70/18 wheels. So power is there.

Going to see how it goes for 6 months. if things are bad, will reggae to 4.10 like a stock Rubicon (I don't tow) as a few guys I know have this and 35x12.5 and feel no change over stock. Anything bigger is a waste of time and fuel. I live is SFLA and its a flat commute here. Plus no rock crawling down here. So I don't need big off road gears. For me 4.10 is the sweet spot.

Who know, maybe 3.21 will be fine. But next Jeep with get 3.73 at a minimum. But tat's 5-6 years from know and tech will change.
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Old 11-28-2016, 04:00 PM   #14
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We've got 2 JKUWW's(3.73), and a JK Sport(3.21). All three on AEV 2.5 kits with 315/70-17 Cooper ST MAXX.
The 3.73's work fine. The JK is gonna get 4.10's here within the next week or so.
That being said, I've driven it every day for a year and a half with the 3.21's.
I just run it in 4th, and in the mountains upstate, I'll manually shift it.
Is it great, no, is it terrible, no
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Old 11-28-2016, 04:42 PM   #15
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Quote:
Originally Posted by ScaldedDog View Post
I don't get the whole spend-a-fortune-to-look-cool thing, but it's not my money, and I'm not that cool. For that matter, I'm not happy with 4.10's and 35's, much less 3.21s. Again, to each his own.

As to damage, I'm not sure what "things will wear faster" with larger tires and taller gears. Your torque converter will spend more time unlocked, particularly in traffic. That doesn't hurt anything, but it does build heat, which is tough on transmissions, as a rule. Your Sport doesn't have a transmission temp gauge, so unless you add one you'll never know if it's getting hot, so why worry about it? Yours will likely run a few degrees hotter than a one in a properly geared vehicle, which is nothing. I don't see a downside for the other components. You're running the motor lower in the RPM band than optimal, but if that hasn't bugged you yet, it isn't going to. You're certainly not "lugging it", unless Jeep used a really low stall speed converter in the JK, which I don't think is the case. You can watch the tach and see if that's happening.

Mark
Thank you for your detailed response!
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Old 11-28-2016, 04:49 PM   #16
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I also hope folks reading this who do Offroad their rig understand that wheeling this kind of setup is way less than ideal on the trail. Without lockers and proper gearing (or benefit of a Rubicon 4:1 tcase) you need to skinny pedal obstacles a better geared and locked rig could crawl. You will get a lot more wheel spin. Skinny pedal + wheel spin = drastically increased chances of important parts going crunch. Beware the skinny pedal when wheeling these too high gearsets and big tires.
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Old 11-28-2016, 05:43 PM   #17
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I have 35x12x17 on my '12 JKUS with 3.21....I have done Red lake, Part of the Dusy Ershim, Bald Mt x 10+, Brewer Lake, Shuteye Peak, Buck Rock Trail, and many other trails and obstacles using my Jeep for Search and Rescue and I have VERY LITTLE issue with the 3.21, other than having to give a bit more skinny pedal over obstacles than I'd like. It is also my Daily driver and does great. It is also my tow vehicle which I tow a 19' tent trailer weighing about 3500lbs-over hills, flat roads, canyons etc. It is also my mall crawler and has very little issue jumping curbs or parking next to other Jeeps at the gym.

Argument over for me.. 3.21 aren't THAT bad and you can wheel with them, flat track, tow or not.
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Old 11-28-2016, 06:50 PM   #18
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I'm assuming running 3.21s with a manual isn't a great idea. I'm probably murdering my clutch taking off. Night n day difference when i swapped wheels n tires, for the worse. Planning on doing 4.56 or 4 88 next month.
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Old 11-28-2016, 09:05 PM   #19
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Quote:
Originally Posted by mommymallcrawler View Post
I also hope folks reading this who do Offroad their rig understand that wheeling this kind of setup is way less than ideal on the trail. Without lockers and proper gearing (or benefit of a Rubicon 4:1 tcase) you need to skinny pedal obstacles a better geared and locked rig could crawl. You will get a lot more wheel spin. Skinny pedal + wheel spin = drastically increased chances of important parts going crunch. Beware the skinny pedal when wheeling these too high gearsets and big tires.
O.P. clearly said, "no off road". Your post doesn't apply to him.
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Old 11-29-2016, 01:31 PM   #20
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Quote:
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O.P. clearly said, "no off road". Your post doesn't apply to him.

Which is why I said "folks reading this who do Offroad". :-)
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Old 11-29-2016, 06:48 PM   #21
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Which is why I said "folks reading this who do Offroad". :-)
No, it's just another thread where you insist that the only way to enjoy a Jeep is by spending scads of money on farkles. Par for the course.
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Old 11-29-2016, 07:58 PM   #22
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No, it's just another thread where you insist that the only way to enjoy a Jeep is by spending scads of money on farkles. Par for the course.
Excuse me? You can enjoy a Jeep with zero straight off the showroom floor. If you want to run a Jeep with big tires, that is when it starts costing money to do it the right way.
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Old 11-29-2016, 08:40 PM   #23
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Originally Posted by mommymallcrawler View Post
Excuse me? You can enjoy a Jeep with zero straight off the showroom floor. If you want to run a Jeep with big tires, that is when it starts costing money to do it the right way.
Everyone has their own idea of the "right way". My right way most certainly won't be your right way... Everyone's needs and budgets are different.

What I've gathered from some very pointed responses in the past is your idea of the "right way" is how you built your jeep. This may be what others are seeing as well and are trying to point out to you in some of the other threads....maybe not so tactfully though :-)

A lot of that happens around here and I'm not exempt either. I think this forum would be better served both by the person asking and the ones responding to understand where each of us are coming from. We're all not going to build our jeeps just the same.... That would be boring wouldn't it?

I've wheeled with some guys with very different setups and guess what, we all made it to the same place. My buddies' setups won't work for me and mine won't work for them, but we all have fun along the way. Everyone ease up a little bit and enjoy the jeep culture. (Or Toyota, LR....whatever) I say run what you brought.

Now to the OP's question I personally wouldn't run 35s on 3:21s. There are those on here that do and have no issues. So you can do it. Your jeep isn't going to blow up... It may cause more wear on the trans due to the increased down shifting that will occur. It will be sluggish too (but that is a relative term). So long as you're aware of what things are going to be impacted and you're OK with it I say go ahead.
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Old 11-29-2016, 08:58 PM   #24
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Old 11-29-2016, 09:52 PM   #25
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Originally Posted by Bencalexander View Post
Everyone has their own idea of the "right way". My right way most certainly won't be your right way... Everyone's needs and budgets are different.

What I've gathered from some very pointed responses in the past is your idea of the "right way" is how you built your jeep. This may be what others are seeing as well and are trying to point out to you in some of the other threads....maybe not so tactfully though :-)

A lot of that happens around here and I'm not exempt either. I think this forum would be better served both by the person asking and the ones responding to understand where each of us are coming from. We're all not going to build our jeeps just the same.... That would be boring wouldn't it?

I've wheeled with some guys with very different setups and guess what, we all made it to the same place. My buddies' setups won't work for me and mine won't work for them, but we all have fun along the way. Everyone ease up a little bit and enjoy the jeep culture. (Or Toyota, LR....whatever) I say run what you brought.

Now to the OP's question I personally wouldn't run 35s on 3:21s. There are those on here that do and have no issues. So you can do it. Your jeep isn't going to blow up... It may cause more wear on the trans due to the increased down shifting that will occur. It will be sluggish too (but that is a relative term). So long as you're aware of what things are going to be impacted and you're OK with it I say go ahead.
I would not recommend folks like the original poster build their rig like mine - they aren't rock crawlers. They would not have use or need for probably more than half of what I have done to my rig. That said, there are some general principles - like properly gear for your tires and terrain and use. That has zero to do with me - everything to do with mechanics and engineering.
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Old 11-29-2016, 10:19 PM   #26
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Quote:
Originally Posted by mommymallcrawler View Post
I would not recommend folks like the original poster build their rig like mine - they aren't rock crawlers. They would not have use or need for probably more than half of what I have done to my rig. That said, there are some general principles - like properly gear for your tires and terrain and use. That has zero to do with me - everything to do with mechanics and engineering.
3:21 and 35s still within the allowable gear set according to this chart.... All be it the very minimum, but still allowable. Particularly for someone from Florida where there is minimal elevation change..... What's your point? That it's not how you would do it?
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Old 11-30-2016, 06:12 AM   #27
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Originally Posted by Bencalexander View Post
3:21 and 35s still within the allowable gear set according to this chart.... All be it the very minimum, but still allowable. Particularly for someone from Florida where there is minimal elevation change..... What's your point? That it's not how you would do it?
Her point is that she's got the Best Jeep Evah, and that she rules the world of off-roading, and if you don't "open your wallet" (her actual words to someone asking about a cheap lift), then you don't know what you're doing, and you're going to break your Jeep.

Someone who doesn't live in the Southwest is never going to see the conditions she'll see. Nor is someone with a full-time job, a family, and/or other expensive hobbies.

There are people like her on every car, truck, boat, and motorcycle forum; if you don't do it their expensive way, you're doing it wrong.
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Old 11-30-2016, 06:31 AM   #28
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Mine has the 3:21, 6 speed manual and Toyo AT2 35's. It is a different animal than what it was stock. 6th gear? Forget about it unless you want to go 90. This one is an 09 with the minivan motor. For now..

On mostly flat concrete roads it will hold 75 in 5th with the cruise control. Anything less and it will lose speed and never catch up. It does seem to be a little harder on the clutch since the TC thinks the tires are going to spin, when taking off in 1st. With TC off it does better on take off. To get it moving with TC on, I have to play with the clutch some.

Mine isn't a daily driver, so I can live with a few little things like that.. and it's not going offroad anytime soon. Who cares if it's lifted and running 35's just for the look? It's my $$$.
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Old 11-30-2016, 08:47 AM   #29
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Quote:
Originally Posted by Bencalexander View Post
3:21 and 35s still within the allowable gear set according to this chart.... All be it the very minimum, but still allowable. Particularly for someone from Florida where there is minimal elevation change..... What's your point? That it's not how you would do it?
Folks are free to do whatever they want with their rig. The point of this forum is to discuss, share and learn. No, not everyone is building a rock crawler. But would I ever recommend anyone run 1700rpm? Heck no. That would be irresponsible advice. Gearing is about way more than "does it feel OK and does it move".

Quote:
Originally Posted by 05Train View Post
Her point is that she's got the Best Jeep Evah, and that she rules the world of off-roading, and if you don't "open your wallet" (her actual words to someone asking about a cheap lift), then you don't know what you're doing, and you're going to break your Jeep.

Someone who doesn't live in the Southwest is never going to see the conditions she'll see. Nor is someone with a full-time job, a family, and/or other expensive hobbies.

There are people like her on every car, truck, boat, and motorcycle forum; if you don't do it their expensive way, you're doing it wrong.
I will never recommend put a dirt cheap lift on an expensive 4wd vehicle. It isn't about price even - it's about quality and whether the parts make a good suspension and allow the Jeep to drive at least decently. No, not everyone needs a $5k prerunner long arm suspension. But I am sure everyone would like a Jeep that at least drives and handles well.

Yes I do have Offroad experience. And yes I will continue to share it. I have helped many people, and will continue to do so. That is what WF is about.

I do have a full time job and a family and other hobbies, so your point is?
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Old 11-30-2016, 10:46 AM   #30
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Originally Posted by mommymallcrawler View Post
Folks are free to do whatever they want with their rig. The point of this forum is to discuss, share and learn. No, not everyone is building a rock crawler. But would I ever recommend anyone run 1700rpm? Heck no. That would be irresponsible advice. Gearing is about way more than "does it feel OK and does it move".



I will never recommend put a dirt cheap lift on an expensive 4wd vehicle. It isn't about price even - it's about quality and whether the parts make a good suspension and allow the Jeep to drive at least decently. No, not everyone needs a $5k prerunner long arm suspension. But I am sure everyone would like a Jeep that at least drives and handles well.

Yes I do have Offroad experience. And yes I will continue to share it. I have helped many people, and will continue to do so. That is what WF is about.

I do have a full time job and a family and other hobbies, so your point is?
I, for one, appreciate your advice, and completely agree.

There's multiple ways to get a Jeep on bigger tires. There's the cheapest way possible, which exposes the Jeep to additional risks. There's also the less affordable way, which keeps the original drive train engineering tolerances in mind.
Same argument with HID headlights. Are they illegal? Not necessarily. Are they horribly distracting and downright dangerous to other drivers if not properly installed? Absolutely.

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