What gear ratio should I install in my Jeep Wrangler TJ / LJ? (and other re-gearing FAQs)
- Thread starter Chris
- Start date
Didn’t realize there even was a guinea pig trying to install them. That would have been nice to see out.
Have to wait and see at this point... Wonder how the 5.89's would do with 35's over 37's? Behind a 42RLE....
Different engine. My expirences without and now with a supercharger are not the same. All I can say is that the 42rle is less annoying with however more horsepower mine has and I still wish the gearing was deeper.
I was referring to wildman being in contact with pnwlj and possibly getting feedback from our guinea pig.
I'm not sure if you mean you wouldn't trust 5.89s with more than stock power or mean something else?
I do agree that engines with more torque are more forgiving in less than ideal situations for lower output engines
People in the know and who I trust were a unwilling to take the risk with 5.89, 42rle, 35s, 4.0L despite having every opportunity to try it.
You mentioned engines. I'm not sure what your point was?
I wouldn't run 5.89s so I have no skin in the game. I just wonder if pnwlj has blown out those diffs yet. I remember Blaine saying he wouldn't use them.
Ok, good. I was always planning my build around going to 35s but now I'm thinking about just staying at 33s and was doubting whether 5.38 was still the right ratio.
The 42rle pushing 5.38s is not deep enough for 35s. Even with a supercharger.
But it's the deepest I can do in my Rubicon axles.
I know, I was just saying it doesn't matter if it isn't deep enough, it's the best I can do without new axles.
I would argue that a 42rle and a 32" tire should have 5.38s.
42rle/31”/5.38=3018rpm @ 75mph
I can say for sure that 285/75r16 tires **definitely** need more than the stock Rubicon 4.10 gears. Especially if you live anywhere that isn't perfectly flat.
Last edited:
kevnls
New Member
Update (I'm sure this will help so many people sleep at night again). I did the 4.88 swap on this raging squirrel machine and it feels like the right call. It's a bit more shifting for cruising around town, but why do you think I bought a 6-speed manual if I don't love shifting? New question though. Speedo-gear. I think it's looking like a 41 based on this chart https://www.novak-adapt.com/catalog/transfer-case-parts/np-speedometer-gears/. Does anyone have any experience with this on an '05 4-banger with 31" tires and an NV231 transfer-case?
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