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Old 08-14-2012, 02:38 AM   #1
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Should they stay or should the go....

I recently purchased my first jeep, a 2006 tj. Came with I think a 4" lift and I Wana say 33" tires. Unsure, but the tire wall reads Lt305/70 r16. not sure if that helps or not. But they look pretty much brand new. I also think the gears haven't been upgraded to match the tires b/c I go about 5mph faster then what is displayed on my dash (per speed trap display thing) this is my DD and I drive about 60 miles a day. It's killing me on gas, so my question is. Should I sell the wheels and tires and lower the lift to a 2" or 3" lift or just change the gears?

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Old 08-14-2012, 02:42 AM   #2
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Also the spare is tweaking the hell out
Of my tailgate....

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Old 08-14-2012, 04:01 AM   #3
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Jeeps get crappy mileage regardless, it probably needs regeared, and shed as much weight as possible
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Old 08-14-2012, 04:19 AM   #4
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Old 08-14-2012, 06:06 AM   #5
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Lowering the height will have no effect on gas mileage unless you go smaller/lighter tire/wheel combo, which is very minimal gas savings. It will probably be cheaper to get a "beater" car than undo your lift to go smaller and maybe chance of vibes if you don't have any. Besides, 3" lift w/31" tires will not look right. Go grab a 6-pack, a can of black plasti-dip, and start blackening the chrome while you contemplate this Jeep altering decision....Nice Jeep
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Old 08-14-2012, 07:40 AM   #6
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Well I would suggest buying another car just like others said but also changing the speedo gear because you are not going to get an accurate gas mileage number with the odo being off. That and I'm that is why your speedometer is off by 5mph. (someone correct me if I'm wrong because I am no expert)
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Old 08-14-2012, 07:53 AM   #7
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Well I would suggest buying another car just like others said but also changing the speedo gear because you are not going to get an accurate gas mileage number with the odo being off. That and I'm that is why your speedometer is off by 5mph. (someone correct me if I'm wrong because I am no expert)
You are right, the mileage is off because the speedo gear was never changed with the new tire size and possible new gears.

OP,
You need to figure out what speedo gear you need based on the measured diameter of your tires and the gears you have. The fact that you are actually going 5MPH faster also means that you odometer is recording fewer miles than you are actually going which would make your MPG calc lower than actual as well.
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Old 08-14-2012, 07:55 AM   #8
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A lot of those speed trap signs are wrong. There's one in my area that constantly reads about 12mph faster than anyone is going.
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Old 08-14-2012, 07:58 AM   #9
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^ A lot of wrong because ONE in your area is off? Most of the ones I pass are spot on and even when they are off its only a couple MPH.

A better speedo check is to use a GPS Speedo application on your smart phone if you have one, they work great.
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Old 08-14-2012, 09:16 AM   #10
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^ A lot of wrong because ONE in your area is off? Most of the ones I pass are spot on and even when they are off its only a couple MPH.

A better speedo check is to use a GPS Speedo application on your smart phone if you have one, they work great.

Yes a lot.. There's also the one near my dad which is off, another that picks up cars way behind you.

They aren't meant as speeding ticket tool, just as a warning that people are driving fast for the area. Their accuracy is suspect.
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Old 08-14-2012, 01:42 PM   #11
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Quote:
Originally Posted by fourty4magjr
Well I would suggest buying another car just like others said but also changing the speedo gear because you are not going to get an accurate gas mileage number with the odo being off. That and I'm that is why your speedometer is off by 5mph. (someone correct me if I'm wrong because I am no expert)
I am 21 and unable to buy another car and I've fallen in love with my jeep. So I guess
My only option is the speedo. How much do the gears run? Is easy to do your self or should I have my mechanic do it and how
Much do they normally charge to do it? How much gas will it save to change, will it even be worth it?
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Old 08-14-2012, 01:53 PM   #12
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Originally Posted by Wattapunk
Lowering the height will have no effect on gas mileage unless you go smaller/lighter tire/wheel combo, which is very minimal gas savings. It will probably be cheaper to get a "beater" car than undo your lift to go smaller and maybe chance of vibes if you don't have any. Besides, 3" lift w/31" tires will not look right. Go grab a 6-pack, a can of black plasti-dip, and start blackening the chrome while you contemplate this Jeep altering decision....Nice Jeep
I want to get rid of the chrome so badly. A 6 pack and some paint isn't such a bad idea. Can you pm with further instructions on painting my chrome pieces? Thank you
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Old 08-14-2012, 01:54 PM   #13
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The gear wont save you gas, it helps makes your calculations more exact. Its a 5min fix and you can do it yourself.

Here is everything you need to know Changing Your Jeep Speedometer Gear

You need to figure out what gears you are running as well. Start by checking the rear diff for a metal tag with it written on it. The tag is usually on the left side of the diff cover. If you dont have one then they have more than likely been changed out and you will need to follow step 3 in this link

FAQ - How do I determine my gear ratio? - JeepForum.com
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Old 08-14-2012, 01:55 PM   #14
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Quote:
Originally Posted by raramirez View Post
I am 21 and unable to buy another car and I've fallen in love with my jeep. So I guess
My only option is the speedo. How much do the gears run? Is easy to do your self or should I have my mechanic do it and how
Much do they normally charge to do it? How much gas will it save to change, will it even be worth it?
You can do it your self. check here, they are cheap.

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Old 08-14-2012, 02:36 PM   #15
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Your tires are 33". So if you have the awesome 3.07 gears like me, regearing will help alot.

My speedo is off by about 12% going from stock 28" to 32".
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Old 08-14-2012, 02:42 PM   #16
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Having a reputable shop regear both your diffs is typically about $1200 +/-.
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Old 08-14-2012, 02:46 PM   #17
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I want to get rid of the chrome so badly. A 6 pack and some paint isn't such a bad idea. Can you pm with further instructions on painting my chrome pieces? Thank you
Don't use that plasti-dip crap. It peels off. Not quiet sure why some believe plasti-dip is the cure all for all that is desired black. I swear some people would plasti-dip their Cheerios if they could.

SEM Trim Black or Krylon Satin Black is much better.
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Old 08-14-2012, 02:47 PM   #18
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Regear for better driving characteristics and get a Speedo correction. I can recommend the speedohealer by blue monkey since thats.what I have. The superchip tuner is worthless and wont correct your Speedo although they claim they do. Aside from that youve got a good looking rig.
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Old 08-14-2012, 02:53 PM   #19
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Why is everyone telling him to regear when we dont even know what gears he has? He was asking about the speedo gear to correct his speedo/odo. Having a correct odo will make his MPG calculations correct as well.
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Old 08-14-2012, 03:01 PM   #20
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Why is everyone telling him to regear when we dont even know what gears he has? He was asking about the speedo gear to correct his speedo/odo. Having a correct odo will make his MPG calculations correct as well.
Because he stated this:

Quote:
Originally Posted by raramirez View Post
I drive about 60 miles a day. It's killing me on gas, so my question is. Should I sell the wheels and tires and lower the lift to a 2" or 3" lift or just change the gears?
While the speedo gear will correct the calculations, it won't change the actual MPG's that regearing the diffs will.
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Old 08-14-2012, 03:21 PM   #21
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Quote:
Originally Posted by homebrwd
The gear wont save you gas, it helps makes your calculations more exact. Its a 5min fix and you can do it yourself.

Here is everything you need to know Changing Your Jeep Speedometer Gear

You need to figure out what gears you are running as well. Start by checking the rear diff for a metal tag with it written on it. The tag is usually on the left side of the diff cover. If you dont have one then they have more than likely been changed out and you will need to follow step 3 in this link

FAQ - How do I determine my gear ratio? - JeepForum.com
Oh I see... Well if it's not gonna save on anything I'll just leave it how it is. Will not changing the gear ruin anything in the transmission?
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Old 08-14-2012, 03:23 PM   #22
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Originally Posted by Dextreme View Post
Because he stated this:



While the speedo gear will correct the calculations, it won't change the actual MPG's that regearing the diffs will.

He doesn't know what his actual mileage is. The odometer is off because the speedo gear is wrong. He would need to use the odometer to calculate his gas mileage, therefore his current calculations are wrong. He may be, and more than likely is, getting better mileage than he thinks he is.
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Old 08-14-2012, 03:31 PM   #23
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Originally Posted by homebrwd View Post
He doesn't know what his actual mileage is. The odometer is off because the speedo gear is wrong. He would need to use the odometer to calculate his gas mileage, therefore his current calculations are wrong. He may be, and more than likely is, getting better mileage than he thinks he is.
Understood, but Jeep gauges are so crappy that even the correct speedo gear will not be "actual". lol The way I do it is if I my speedo it off about 5 mph at 60mph, then I add about 10% back in (could use 12% but 10% is easier to do in my head by moving decimals).

230miles/15gallons = 15.3 (per uncorrected odometer)
15.3*.10 = 1.53
15.3 + 1.53 = 16.83 mpg
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Old 08-14-2012, 04:17 PM   #24
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Quote:
Originally Posted by Dextreme

Because he stated this:

While the speedo gear will correct the calculations, it won't change the actual MPG's that regearing the diffs will.
Oh ok that makes sense I don't care about the odometer or speedometer but I do care about milage how easy is it to regear? Or is that something to take in. Like I said I don't think they geared it after putting the tires on. If I don't change the speedo will it lead to problems?
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Old 08-14-2012, 04:44 PM   #25
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You need to figure out if its regeared or not, I gave you a link further up to figure it out. Then go from there. One question what is your current calculated mileage? I know it wont be accurate but I am curious.

As far as the speedo/odo if you plan to keep the Jeep forever its no problem but if you ever sell it your odometer will be wrong and by that time I would suspect by a lot. If that is ever figured out or the new owner is not informed its a felony. Outside of that just remember that your speedo is reading slow so you dont get a ticket. Once you regear though your speedo will be off from what it currently sits because of the gear change so you will need to figure out how far off or change the speedo gear.
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Old 08-14-2012, 05:08 PM   #26
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Quote:
Originally Posted by homebrwd
You need to figure out if its regeared or not, I gave you a link further up to figure it out. Then go from there. One question what is your current calculated mileage? I know it wont be accurate but I am curious.

As far as the speedo/odo if you plan to keep the Jeep forever its no problem but if you ever sell it your odometer will be wrong and by that time I would suspect by a lot. If that is ever figured out or the new owner is not informed its a felony. Outside of that just remember that your speedo is reading slow so you dont get a ticket. Once you regear though your speedo will be off from what it currently sits because of the gear change so you will need to figure out how far off or change the speedo gear.
Still trying to figure out my milage will find that out in a few days but I think I fill up about 3 times a week. Man this sounds like a lot. Ok I will look up the link and figure out what needs to be done. Thank you for your help.
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Old 08-14-2012, 07:20 PM   #27
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Did I miss where it says what motor and trans you have? 4 or 6 cyl, stick or auto?
I think it has the perfect stance and tire size, Just regear and it will help.
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Old 08-14-2012, 08:01 PM   #28
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Did I miss where it says what motor and trans you have? 4 or 6 cyl, stick or auto?
I think it has the perfect stance and tire size, Just regear and it will help.
Oh yes sorry 6cyl 4ltr automatic. I like the height and tire size as well. Regearing is my best bet thank you. Does anyone know the price to get it regeared Or where to buy the gears so I can have my mechanic do it. I still have to look for the gears that are in it but I'm almost positive they are wrong
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Old 08-14-2012, 08:10 PM   #29
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I would diff regear your on the right track! good looking jeep by the way!
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Old 08-15-2012, 12:35 AM   #30
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Originally Posted by Murrdog66
I would diff regear your on the right track! good looking jeep by the way!
Thank you!! Got it used at a jeep dealership w/ only 4,000 miles... Although b/c the speedo/odo gear isn't right maybe a little more but still not bad for an 06!! I couldnt pass it up!!! I've fallen in love ever since. I love the community and all the things that are available to upgrade! Just wish I had more money...

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