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Topic Review (Newest First)
09-07-2012 12:51 PM
Jerry Bransford
Quote:
Originally Posted by njp2295 View Post
I have some questions about regearing
1. When people refer to regearing they are talking about the differential correct?
2. I have a 2005 SE with 4.0L auto what is my gear ratio for the front and rear? (for what I know there has been no mods done on my wrangler.)
3. Will 32 to 33's work with the gearing I have?
4. If it does not work what will be the best preferable gear ratio?
Your automatic transmission is the 4-speed 42RLE so be wary of axle ratio recommendations that don't take your particular transmission into account. Your 42RLE's final Overdrive gear ratio is very (!) steep which means it drops the engine RPMs down much lower at cruising speeds than most other transmissions do. That is not a good thing for most of us since those RPMs are so low that when you install bigger tires, the engine can lug on the highway.

Your 42RLE 4-speed automatic transmission basically means you need to regear your axles (differentials) to a lower ratio than might be expected or commonly recommended for a given tire size. By lower ratio, don't get confused by ratio numbers which go in the opposite direction to higher/lower ratios. For example, a 4.88 axle ratio is a much lower ratio than 3.73 is.

Your Jeep likely has 3.73 gears installed at this time. For 33" tires, a 4.88 axle ratio is optimal. Yes I know 4.88 may sound like too low of a ratio but for your particular transmission, 4.88 is actually optimal... especially for the highway where 4.88 will produce optimal RPMs, not exessive engine RPMs like some might think.

To regear your axles, and both must be regeared to the same ratio, plan on it costing anywhere from $1100 to $1300 on average. That pricing includes parts and labor for both axles.
09-07-2012 09:58 AM
Heliotropic
Quote:
Originally Posted by Neil F.

Stock TJ Specifications - JeepForum.com

05-06 4.0 was optional on the SE
I stand corrected. Thanks for the info.
09-07-2012 07:53 AM
4Jeepn 4.10 to 4.56 with the auto and 33's, depending on which auto trans you have. that being said, I will guess you have a dana 35 rear. so before spendng hundreds to regear also consider some form of rear axle upgrade, be it just some upgraded shafts or an axle swap.
09-07-2012 07:44 AM
Neil F. Originally Posted by njp2295
I have some questions about regearing
1. When people refer to regearing they are talking about the differential correct?
Yes, well to be more precise the gears that are located inside the diffs.

2. I have a 2005 SE with 4.0L auto what is my gear ratio for the front and rear? (for what I know there has been no mods done on my wrangler.)
I don't know what gears you have, but if you crawl under it and look on the axle at or on the diff there is going to be a little metal tag held on by a bolt. It will have your gear ration on it. It will be the same for the front and rear.

3. Will 32 to 33's work with the gearing I have?
It will work, you will lose "power" though. It will be slower off the line and not accelorate as well.

Without knowing what gears he currently has, it may be tollerable to a complete dog4. If it does not work what will be the best preferable gear ratio?
Don't quote me on this, but I think I've read 4:10's will work for your situation.

4.10 is not optimal for 33 or 32 but recommendation cannot be made without knowing what tranmission
09-07-2012 07:39 AM
Neil F.
Quote:
Originally Posted by Heliotropic View Post
Something doesn't jive...
The SE is a 2.4L 4cyl.
4.0L is 6cyl found in the X, Sport, Rubi.

So which is it?
Stock TJ Specifications - JeepForum.com

05-06 4.0 was optional on the SE
09-07-2012 06:02 AM
njp2295 an yea its def a 6 cyl because i changed six spark plugs
09-07-2012 06:01 AM
njp2295 thanks
09-06-2012 08:48 PM
CMA_Rider
Quote:
Originally Posted by Heliotropic
Something doesn't jive...
The SE is a 2.4L 4cyl.
4.0L is 6cyl found in the X, Sport, Rubi.

So which is it?
If I'm not mistaken, I believe there were a few se's that came with a 4.0
09-06-2012 08:47 PM
jasongind
Quote:
Originally Posted by njp2295 View Post
I have some questions about regearing
1. When people refer to regearing they are talking about the differential correct?
Yes, well to be more precise the gears that are located inside the diffs.

2. I have a 2005 SE with 4.0L auto what is my gear ratio for the front and rear? (for what I know there has been no mods done on my wrangler.)
I don't know what gears you have, but if you crawl under it and look on the axle at or on the diff there is going to be a little metal tag held on by a bolt. It will have your gear ration on it. It will be the same for the front and rear.

3. Will 32 to 33's work with the gearing I have?
It will work, you will lose "power" though. It will be slower off the line and not accelorate as well.

4. If it does not work what will be the best preferable gear ratio?
Don't quote me on this, but I think I've read 4:10's will work for your situation.

I have a Rubicon so Dana 44 axles, I'm not sure what your axles will handle.
09-06-2012 08:46 PM
Heliotropic Something doesn't jive...
The SE is a 2.4L 4cyl.
4.0L is 6cyl found in the X, Sport, Rubi.

So which is it?
09-06-2012 08:16 PM
njp2295
regearing?

I have some questions about regearing
1. When people refer to regearing they are talking about the differential correct?
2. I have a 2005 SE with 4.0L auto what is my gear ratio for the front and rear? (for what I know there has been no mods done on my wrangler.)
3. Will 32 to 33's work with the gearing I have?
4. If it does not work what will be the best preferable gear ratio?

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