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Old 09-07-2008, 12:19 PM   #1
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Any Realistic Solution PLease

Hey guys my name is Paul and Im a senior at the University of Houston. I just recent recieved conformation that i got accepted to a job after graduation. So needless to say i dont have much money.

My problem is i will be required to drive about 40-50 miles daily and my tj will not push any further than about 68mph. For me thats not really a big issue for my regular driving but when traffic and off set schedules are invovled its more difficult.

I have a 4 cyl and i was trying to find out whats the best solution for me cause as of now i have it up for sale thinking i can get a 6cyl but many people have said that is not the only way. and i was seeing if i can get some pointers because I REALLY DONT want to sell my jeep.


ANY SUGGESTIONS????

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Old 09-07-2008, 12:41 PM   #2
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I drive a 04 TJ 4 cyl and commute 100 miles round trip. Although mine will go a bunch over 65 I do not waste the gas any longer exceeding the speed limit. By running at 65 I have increased my MPG from 16-17 to 20-21 MPG. And only use the A/C when the wifey insist. Now that could be why you cannot get over 68, I have been in the south and the heat & humidity really sucks. Espically down your way. You have to remember you are driving a squared off bread box.

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Old 09-07-2008, 12:45 PM   #3
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i think it is more in the sense that i have a lift and heavier tires i guess. And on the highway imm hittin like 3.5 rpm to get near 70
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Old 09-07-2008, 01:30 PM   #4
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If you run at 3500 rpm to do 70 mph, you really need to re-gear. When you bumped to 33's did you change your gearing? No real cheap way to do that.

Your other option would be to go with a smaller tire. I'll bet you could find a set of 31's from someone that just went to a bigger tire. I just sold my stock tires (with about 50% tread left) on the stock ravines for $100. It may not look as good as the 33's but it would help your problem.
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Old 09-07-2008, 01:36 PM   #5
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I only run 30x9.5 because of all the highway driving. Do you know if your speedo was regeared for those tires?
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Old 09-07-2008, 01:52 PM   #6
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Regearing your axles to 4.88 will cost you a lot less than buying a 4.0L TJ and restore the power lost by having installed those 33" tires. Do NOT listen to the kid at the parts counter or 4x4 store if he pushes 4.56 instead of 4.88, the 2.5L engine with 33" tires and 5-speed transmission needs 4.88 to truly restore the power.
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Old 09-07-2008, 02:32 PM   #7
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put a bigger engine in it
or just put a different exaust system on it and a airraid spacer on it, it helped me for when i go home on leave
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Old 09-07-2008, 03:38 PM   #8
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i have 33's and 31's but dont want to go back down to 31's. i have 4:10 ratio right now
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Old 09-07-2008, 07:16 PM   #9
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or just put a different exaust system on it and a airraid spacer on it, it helped me for when i go home on leave
Such minor changes like that don't help in the least with his kind of problem after having installed bigger tires.
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Old 09-07-2008, 07:43 PM   #10
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  • install some smaller tires
  • regear your axles
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Old 09-07-2008, 07:51 PM   #11
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I drove around on 30's with 6" of lift for back and forth to work, 40 miles one way, then changed to the 33's for the trail runs.. Just depends on what you are willing to do.
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Old 09-07-2008, 07:55 PM   #12
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but small 30s with 6" of lift look a bit funny IMO. i don´t think that "dweebster" wants to do do that..
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Old 09-07-2008, 08:06 PM   #13
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Hey guys my name is Paul and Im a senior at the University of Houston. I just recent recieved conformation that i got accepted to a job after graduation. So needless to say i dont have much money.

My problem is i will be required to drive about 40-50 miles daily and my tj will not push any further than about 68mph. For me thats not really a big issue for my regular driving but when traffic and off set schedules are invovled its more difficult.

I have a 4 cyl and i was trying to find out whats the best solution for me cause as of now i have it up for sale thinking i can get a 6cyl but many people have said that is not the only way. and i was seeing if i can get some pointers because I REALLY DONT want to sell my jeep.


ANY SUGGESTIONS????
Get rid of the 33" tires and get it down to AT THE MOST a 31, 30 would be better.
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Old 09-07-2008, 08:13 PM   #14
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i have 33's and 31's but dont want to go back down to 31's. i have 4:10 ratio right now
you have your answer. Smaller tires will help power and economy. Use larger tires for off road or when your not on the road all the time commuting. I would ditch my 35s MTs for smaller less aggressive tires if I were commuting in the Jeep. I love my tires, but its stupid to waste them on the highway.
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Old 09-07-2008, 09:14 PM   #15
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I drive 78 miles one way to work everyday, 6 cyl 6 speed, 33's 3.73's and its tight on the wallet. I know all about the 68mph, it sucks. I dont care what anyone says, Im getting better mph with the 33's then stock. argue all you want, but my rpms went from 2550 stock tires at 65mph to 2100 at 65mph with 33's. I always used 12.4 gallons a day and now Im using 10.3 a day. Yes, its all written down, even the price per gallon I paid and what the mileage was when I filled up.
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Old 09-07-2008, 10:01 PM   #16
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I drive 78 miles one way to work everyday, 6 cyl 6 speed, 33's 3.73's and its tight on the wallet. I know all about the 68mph, it sucks. I dont care what anyone says, Im getting better mph with the 33's then stock. argue all you want, but my rpms went from 2550 stock tires at 65mph to 2100 at 65mph with 33's. I always used 12.4 gallons a day and now Im using 10.3 a day. Yes, its all written down, even the price per gallon I paid and what the mileage was when I filled up.
Ever driven a 4 cylinder jeep?

There is not a way in hell bigger tires will ever help gas mileage.

I believe you're situation, especially with the 3.73s. The 4 cylinder just wasn't meant to push tires bigger than 30s on the stock gears. Re-gearing is a viable cure, but an expensive one.
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Old 09-07-2008, 10:17 PM   #17
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yeah for sure, re gear to 4.88 and you will be fine. to purchace it will be in the ball park of $300.00 and if you can leave the beers alone long enough to torque bolts properly, and look at some gear paste and see if you need a shim, then you'd be an idiot to have a shop put them in for you as well. it's an "involved easy" job that just scares most away from doing it.
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Old 09-07-2008, 11:44 PM   #18
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ok the tires no way am i gonna drop 30's cause then i just look like an idiot but i am interested in the gear ratio thing... how does that work and what should i get or need i mean i have about 1800 dollars saved up
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33x12.5 BF Goodrich A/T
15x8 Rockcrawler steel wheels
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BLACKed out all chrome parts
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quater mile remote & motion sensor alarm w/ remote start
. . . and then some

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Old 09-08-2008, 06:18 AM   #19
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ok the tires no way am i gonna drop 30's cause then i just look like an idiot but i am interested in the gear ratio thing... how does that work and what should i get or need i mean i have about 1800 dollars saved up
You will need two sets of gears, front and rear, two master install kits, magnetic mount dial indicator.
backlash
It's not hard if you know what you are doing, do it wrong and you just wasted a set of gears big time. The biggest thing is to be able to recognize when you are doing it wrong or 'somethings not right' BEFORE you button it up and drive it.
as for going from 33's to 30's, consider we are talking wallet here. Keeping a good set of off road tires and a good set of commuter tires is a better alternative.
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Old 09-08-2008, 06:24 AM   #20
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ok the tires no way am i gonna drop 30's cause then i just look like an idiot but i am interested in the gear ratio thing... how does that work and what should i get or need i mean i have about 1800 dollars saved up
I don't think I looked like an idiot with the 30's. However if you have 1800 dollars saved up.. go buy a used honda...simple solution, get 30+ miles to the gallon problem solved. Gear change 1000 bucks, and only gain a few mpg.
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Old 09-08-2008, 09:04 AM   #21
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I was thinking of gettin another car but its pretty complicated hence why i need to work it out with the jeep so what kind of axles are good and i believe some one said 4:88 ratio correct
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4in skyjacker performance flex lift kit
33x12.5 BF Goodrich A/T
15x8 Rockcrawler steel wheels
Airaid intake
+44 flowmaster exhaust system
BLACKed out all chrome parts
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quater mile remote & motion sensor alarm w/ remote start
. . . and then some

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Old 09-08-2008, 11:07 AM   #22
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I was thinking of gettin another car but its pretty complicated hence why i need to work it out with the jeep so what kind of axles are good and i believe some one said 4:88 ratio correct
4:88 are the biggest gears you will be able to fit in that D35.
Both my 97 TJ's get a solid 20mpg with 4:10's and 30x9.50's.
One other thing, the engine likes to run in it's sweet spot, on the 4.0L thats 2600, pretty close on the 2.5L too, run the engine at 2000 or 1800 on the hiway and your MPG will go down.
I have LT235's which are a 1/2" short of 30" on my XJ, 5 speed, stock tires were 215's, I don't use 5th gear unless I'm going over 70.
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Old 09-08-2008, 12:55 PM   #23
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i want to get new axles as well or can is the d35 what you are referring that i need to get and then d35
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33x12.5 BF Goodrich A/T
15x8 Rockcrawler steel wheels
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BLACKed out all chrome parts
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quater mile remote & motion sensor alarm w/ remote start
. . . and then some

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Old 09-08-2008, 03:00 PM   #24
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i want to get new axles as well or can is the d35 what you are referring that i need to get and then d35
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Old 09-08-2008, 04:04 PM   #25
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ok i guess i didnt phrase that right. but you said thats the highest you can get on a D35 so does that mean thats the only axle i can get or is this like a better axle that will fit better ratio. bottom line is i just want my jeep to run atleast 75mph with out run at a high rpm
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4in skyjacker performance flex lift kit
33x12.5 BF Goodrich A/T
15x8 Rockcrawler steel wheels
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BLACKed out all chrome parts
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quater mile remote & motion sensor alarm w/ remote start
. . . and then some

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Old 09-09-2008, 06:30 AM   #26
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so can i get an clear answer on which axles i need front and back. also about how much it should cost and where i would be able to find a set for reasonable price?
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4in skyjacker performance flex lift kit
33x12.5 BF Goodrich A/T
15x8 Rockcrawler steel wheels
Airaid intake
+44 flowmaster exhaust system
BLACKed out all chrome parts
hyperwhite lights
soundbar & pod speackers
quater mile remote & motion sensor alarm w/ remote start
. . . and then some

http://www.myjeepspace.com/dweebster
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Old 09-09-2008, 08:55 AM   #27
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so can i get an clear answer on which axles i need front and back. also about how much it should cost and where i would be able to find a set for reasonable price?
You don't need new axles, just change the gears in side the axle housing. You can however upgrade the rear dana 35 with stronger axle shafts if you want. Gears cost about 400-500 dollars plus install figure about 1000k total for front and rear. If you want to put a new rear axle in, as in the whole thing, a TJ dana 44 will be a direct swap used ones go for around 1000, new custom one's can be 2-4k depending what you gears, lockers shafts etc you have installed on them. OR you can get a super 35 kit with new stronger shafts and a locker for about 1000 as well.
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Old 09-09-2008, 09:11 AM   #28
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another idea is to is to call it quits and get a different vehicle. spending $1200 -$1500 to regear the axles just to try save gas money hopeing that your mpg will increase doesn't make sense. I do agree that regearing will make the rig a better trail rig. I drove my old yj with 2.5 cyl on 33" tires with 4.10 gearing and while it wasn't the best in the world it still got my to school and work perfectly fine. But if your in such a bind that its not working out for you, spending even MORE cash on this money pit we call a jeep isn't going to help
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Old 09-09-2008, 09:15 AM   #29
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ok i guess i didnt phrase that right. but you said thats the highest you can get on a D35 so does that mean thats the only axle i can get or is this like a better axle that will fit better ratio. bottom line is i just want my jeep to run atleast 75mph with out run at a high rpm
and regearing with 4.88 gears will only make your RPMs HIGHER than they are now when trying to go 75mph... so if you want to go that fast with lower RPMs then you need to go to 3.07 or get 38" tires, LOL... but then your rig will totally SUCK on the trail and at stop lights.

Either get another vehicle or stop trying to go 75mph in a 2.5 cyl jeep while expecting good gas mileage.
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Old 09-09-2008, 11:07 AM   #30
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You can buy D44's complete from axle to axle from Jeep for about $1200 EACH, that includes disc brakes in the rear as well as lockers.

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