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Old 04-03-2012, 07:07 PM   #1
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Post Regearing and Tranny Question

So my problem is I've got a 2002 TJ sport that has an I6 and the stock auto tranny(get to that in a minute). But its in serious need of an economy boost from 10mpg and power gain because it wont even get out of its own way on a small hill. I'm running 35x12.50 tires and don't want to go down in size because I've got bigger plans for the jeep later down the road, wont be putting any bigger tire on ever though. I've read some post that say 4.56 is enough and heard 4.88's is better, which do i need? Also I've got the dana 30 up front and the dana 35 out back not sure if its the dana 35 or 35c idk what the difference is anyway.... Now for the water to sink the boat, money wise. The stock tranny is starting to slip between 2nd and 3rd, where do i go from there?!?! I've already tried all the little simple fixes but im past that, so will a master rebuild kit fix the issues, or just get a stock tranny to replace it and have it all done at once, or is there a little easier way to save my wallet some heartache? Also what is the best option tranny wise if going back stock isn't the answer?? thanks any help is good help!?

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Old 04-03-2012, 07:24 PM   #2
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i would stay with a 32rh which is the tranny you have. it's the best auto a tj can have. you have a d35c or c clip. since the 32rh has no overdrive i wouldn't put 4.88s in your jeep and definitely not lock them with those 35s" tires.

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Old 04-03-2012, 07:35 PM   #3
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I would run 4.56 and keep the 32rh unless you go to something like the aw4 which isnt a wrangler trans but a great swap if your gona do one. 6 in a row said it wel.
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Old 04-03-2012, 07:35 PM   #4
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Originally Posted by 6InARowMakesItGo View Post
i would stay with a 32rh which is the tranny you have. it's the best auto a tj can have. you have a d35c or c clip. since the 32rh has no overdrive i wouldn't put 4.88s in your jeep and definitely not lock them with those 35s" tires.
^^^^ x2
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Old 04-03-2012, 07:42 PM   #5
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Quote:
Originally Posted by 6InARowMakesItGo
i would stay with a 32rh which is the tranny you have. it's the best auto a tj can have. you have a d35c or c clip. since the 32rh has no overdrive i wouldn't put 4.88s in your jeep and definitely not lock them with those 35s" tires.
Quote:
Originally Posted by GoldenSahara00
I would run 4.56 and keep the 32rh unless you go to something like the aw4 which isnt a wrangler trans but a great swap if your gona do one. 6 in a row said it wel.
This ^

4.88s would be good for the 5 speed manual, not the 3 speed auto.
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Old 04-03-2012, 10:19 PM   #6
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thanks fella's, i appreciate the advice. ive been at a lose on what to do or which direction to head in. im gonna stick with the 4.56's. i just want some gas mileage back and the ability to have some kind of power for what it is, and be able to a haul a small trailer. as far as the 32RH goes do you think that a rebuild kit will solve the issue since its not missing a gear and just jumping up and down between them til you get to a greater rpm or speed?
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Old 04-04-2012, 12:29 AM   #7
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Don't give up on your transmission too quickly, there might not be anything wrong with it. The 32rh is tranny has a lock-up torque converter & has fooled many people into beleiving that they have a 4 speed automatic transmission. It works like this, it starts off in first, then shifts into second, then into third just like any other 3 speed transmission. Then as you reach your desired speed and back off of the gas pedal the torque converter locks up. You can see your rpm drop when this happens. There is also a cable connected to the throttle body that can cause the converter to unlock when you press the gas pedal to increase speed. The reason I'm bringing this up is,
With 35 inch tires and (probably) stock 3.07 gears, I'm guessing that you spend a lot of time pressing down hard on the gas pedal & that could be the reason for the jumping up & down between gears that you mentioned. Just my thoughts,FWIW
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Old 04-04-2012, 11:17 AM   #8
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Quote:
Originally Posted by 50Johnbob
Don't give up on your transmission too quickly, there might not be anything wrong with it. The 32rh is tranny has a lock-up torque converter & has fooled many people into beleiving that they have a 4 speed automatic transmission. It works like this, it starts off in first, then shifts into second, then into third just like any other 3 speed transmission. Then as you reach your desired speed and back off of the gas pedal the torque converter locks up. You can see your rpm drop when this happens. There is also a cable connected to the throttle body that can cause the converter to unlock when you press the gas pedal to increase speed. The reason I'm bringing this up is,
With 35 inch tires and (probably) stock 3.07 gears, I'm guessing that you spend a lot of time pressing down hard on the gas pedal & that could be the reason for the jumping up & down between gears that you mentioned. Just my thoughts,FWIW
I agree I was going to say the same.
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Old 04-04-2012, 12:44 PM   #9
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so possibly just a simple regear to 4.56 to start with and see where im at sounds like it may be the best option and if i continue to have tranny problems rebuild it?
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Old 04-04-2012, 01:51 PM   #10
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Originally Posted by FirehawkTJ View Post
so possibly just a simple regear to 4.56 to start with and see where im at sounds like it may be the best option and if i continue to have tranny problems rebuild it?
Yes, that is exactly what I would do
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Old 04-05-2012, 07:56 PM   #11
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thanks guys, i went to the local 4x4 performance shop and had a long talk with the owner on options. looks like we are going to do the front rear axles regear with rebuild kits and the track lock rear end outback, along with the outer tube seals for the dana 35 rear end, and also the true speed calculator for all the gauges and what not inside. gonna be a pretty penny but he drove it and seems to think the tranny will be good.
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Old 04-05-2012, 08:00 PM   #12
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Save your $$$, there is no need to install a Truespeed speedometer calibrator, it only takes 5 minutes to recalibrate your speedometer with a very simple quick speedometer gear swap. The replacement speedometer gear is just snapped into place. Replacing your speedometer gear is a 1/2 banana job.

Here's how... Changing Your Jeep Speedometer Gear

And yes, 4.56 is ideal for 35" tires and your 32RH 3-speed automatic.
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Old 05-08-2012, 11:57 PM   #13
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So I just got my jeep back from having it regeared. Excellent decision and long over due. One thing though. It seems like the torque converter won't lock or its staying in third and I'm worried its gonna screw something up. Any ideas or is it actually locked up but because I drove it so long with the rpms off that I'm just not use to higher rpms at higher speeds. Also it never feels like the rpms drop off after and or in third. Even when I'm backing off the pedal and just cruising along.
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Old 05-09-2012, 02:13 AM   #14
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I would be extremely careful if you are far away from home out wheeling on that D35. I dont know everything but with stock axle shafts you could be in for disaster if not careful.
Go on YouTube and type in Dana 35 snap or something of that reference and you should be able to gauge just how hard you can push those shafts.
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Old 05-09-2012, 08:35 AM   #15
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Quote:
Originally Posted by FirehawkTJ View Post
So I just got my jeep back from having it regeared. Excellent decision and long over due. One thing though. It seems like the torque converter won't lock or its staying in third and I'm worried its gonna screw something up. Any ideas or is it actually locked up but because I drove it so long with the rpms off that I'm just not use to higher rpms at higher speeds. Also it never feels like the rpms drop off after and or in third. Even when I'm backing off the pedal and just cruising along.
That would be my first guess, at the higher rpm that you are running now the lock-up is probably harder to notice. The rpm difference is not that much, somewhere around 200 to 250rpm depending on your speed. It may take you some time to get used to it. If you're still unsure after you drive it a while, you can have a transmission shop check it out for you. Either way your transmission is much happier now than it was with factory gears and 35 inch tires.
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Old 05-09-2012, 11:44 AM   #16
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ok thanks. yea theres no doubt that shafts weak, just funding for this project isnt limitless so im taking it one step at a time, im staying on the road sand easy easy trails until its swapped for stronger shafts. and i talked to the shop today and he said he drove it and it went through all the gears then locked. i guess ive just got to get use to the new rpm range. is it going to hurt the engine to drive like a two hour road trip to say the beach in it at 70 with the rpms reaching almost 3000
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Old 05-09-2012, 11:51 AM   #17
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is it going to hurt the engine to drive like a two hour road trip to say the beach in it at 70 with the rpms reaching almost 3000
Of course it is not. My 3.73 gears and 31" tires spin the motor at >3000rpm at highway speed, often for hours on end. What would make you think that this would hurt the engine?
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Old 05-09-2012, 11:53 AM   #18
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i guess because i drove it for almost two years without a regear and it seems like the engine is running wide open at high speed. even though ik its not. it was just a concern of mine
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Old 05-09-2012, 03:48 PM   #19
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Quote:
Originally Posted by FirehawkTJ
i guess because i drove it for almost two years without a regear and it seems like the engine is running wide open at high speed. even though ik its not. it was just a concern of mine
You'll get used to it. At 60 I spin 2200 and at 80 I spin nearly 3000. Much better than before the regear.
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Old 05-09-2012, 03:58 PM   #20
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ok good. so that is all normal. ill just have to adjust

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