O just opened the thread how identify jeep axles and I see 3.07 listed as well as 3.55. I assume everyone wants to get to go yo 4:11 or higher to get more power.
What gear ratio should I install in my Jeep Wrangler TJ / LJ? (and other re-gearing FAQs)
- Thread starter Chris
- Start date
So happy mine got the 3.73 and limited slip option 
Found this drivetrain specs page.
https://myjeeptj.com/wrangler-write-ups/jeep-tj-general-drivetrain-specifications/
Found this drivetrain specs page.
https://myjeeptj.com/wrangler-write-ups/jeep-tj-general-drivetrain-specifications/
Regearing is generally done to bring the engine back to a more optimal operating speed when larger tires are added.
What did you end up with? I have the 2000 TJ with 33’s and 3.56 gears. Same tranny as you. Driving up anything with over a 3% grade is not fun. Mainly street driver, with some dirt roads, hills occasional small ledges and mud on a few weekends a year. Shop I contacted recommends 4:56.
Assuming you meant 3.55, that was not an option on 2000 TJs. They stopped ovvering 3.55 for the 1998 model year, which is where 3.73 replaced 3.55. So you should have 3.07 or 3.73. For 33's and the 5 speed, I would go with 4.88 myself.
With my 97 I ran 4.56 and 33s but I had the AX5, and since it was a 4cylinder Jeep I didn't use 5th very often when I was out on the open highway or climbing hills at highway speed.
For your set up if you know without a doubt you're never going to need/want to regear again you could get away with 4.56s but I would probably go with the 4.88 just for a few hundred extra RPM to give you back that highway hill climbing ability.
AX5 gear ratios: 3.92, 2.33, 1.44, 1.00, 0.85 and 4.74
NV3550 gear ratios: 4.10, 2.33, 1.39, 1.00, .78 and R3.57
The image below if from grimmjeepers calculator. the RPMs you experience might be slightly different if your spedometer is accurate due to variances in true tire heights, but it wont be by much. As someone who has just recently seen
4.56 gears .................................................................................................. 4.88 gears
As someone who recently discovered what a couple hundred RPM can do climbing a slight incline I can tell you it does make a difference
My current 03 TJR vs the 2000 TJ I sold. The 2000 could climb the local hill into town in 5th (OD) the 2003 (AW4) can not without shifting out of OD. Here's the specs on those 2 TJR on the left TJ on the right
NUBI-RUBI
New Member
06 RUBICON, 6 speed.. South West PA near the MD&WV borders..33/12.5/15s ..lots of long hilly roads and gravel roads, highway driving once in a while short periods, no long trips, like 30 mins max.. (again long gradual grades) ... not a lot off road, fire roads, easy trails..nothing extreme..thing is gutless pulling long hills...got a chance to buy a set of 5.13;s relatively cheap or go with 4.88s? ........I'd be happy with maintaining 65ish on the highway, may eventually go to 35"s later on..
Per the chart on the first post of this thread, 4.56 would be ideal for 33s.
4.88 or 5.13 would be good for 35" tires.
NUBI-RUBI
New Member
I would go 4.56 for 33’s and 6 speed and 4.88 if I had the 5-speed. If any chances of 35’s, then 4.88.
I have 3.07 gearing (I know, they suck) but will be looking at new tires soon and really like the look of 31s. I mainly drive a very boring flat highway for 90% of my driving, Should I look at regearing to 3.73\4.10 just to have peace of mind?
I probably will never go larger than 33s with these axles, but when the mind decides for bigger, I'll just do brand new axles rather than building a super30/35.
The other important junk:
4.0 w/ 32RH
Dana 30/Dana 35 w/ 3.07 gears
I probably will never go larger than 33s with these axles, but when the mind decides for bigger, I'll just do brand new axles rather than building a super30/35.
The other important junk:
4.0 w/ 32RH
Dana 30/Dana 35 w/ 3.07 gears
I thought the Sport 4.0 autos came with 3.73s and only the 2.5 manuals got the dreaded 3.07s?
Its a Sahara, not a sport
Edit: just crawled under and looked at the tag, confirmed its 3.07, looks like its never been opened so I doubt the PO did a regear. It was 99% stock when I bought it, aside from a replacement top and wheels/tired
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Manual 4 cylinders came with 4.10 gears. NEVER 3.07 gears.
Sport models came with different ratios depending on transmission and tire/wheel packages, smaller tires had taller gears. Pretty much just the Jeeps that came with 30/9.50/15s came with the 3.73 gears.
The Sahara is a bit of a black sheep I think. My RPO list shows 30/9.50/R15 with 3.07 gears.
Currently, mine has 235/75r15 michelin defender ltx m/s from the PO and I absolutely hate them for the size and looks on my jeep.