What gear ratio should I install in my Jeep Wrangler TJ / LJ? (and other re-gearing FAQs)
- Thread starter Chris
- Start date
That's the only acception I can think of, because of the low gear ratio in 3rd gear.
Highway or freeway? What speed?
My 32rh/3.73/31's tj was comfortable at 50 mph. Any faster and i was just wasting fuel.
Why don't you like the 3.07's?
Whoops, Fell asleep and the website was down thanks to Cloudflare.
The 3.07 just seem slow overall, main highways/freeways near me are 65-75mph and it lugs to get up to speed, definitely when it goes from stand still to wide open during 5 PM traffic.
Back roads are 40-50 mph depending on the part of town. I have no problem lifting from a stop or maintaining speed there.
My real end goal for my current situation would be 31/10.25R15s and a 2in lift without feeling like a boat anchor. It already sorta feels like one with the 235/75R15s that are on it right now when at highway speeds, takes a bit to pony up to the speed limit unless I absolutely stomp on the skinny pedal.
3.73 and 31s chirp the tires a bit stomping it off the line and felt fine for power at speed.peppy little jeep. Its the top end rev i don't like. Without an overdrive you'll need to compromise one way or another. Maybe 3.55?
Maybe 3.55 but if I do regear, id probably just go full on 4.10 or deeper and lockers. Or pray and find someone getting rid of their D44s.
@hear lmk when you decide to toss 1tons under that jeep
If you plan to use 3.73, just buy used axles with this ratio. I sold my dana35/30 combo for 600$ couple to years ago.
Thats the move, just looking for someone selling them… its slim pickins up here in dallas
example..... https://www.facebook.com/share/KrF1xRRkcSyBDgzT/
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burdetter16
TJ Enthusiast
I figured I'd ask my question here before starting yet another thread on regearing.
2001 Sahara, 4.0L, 32RH 3 speed auto, stock Dana 30/35, 3.07 gears, currently on 33's (yes, it's a dog).
I am going to be regearing soon as well as installing a Super 35 and lockers. I plan to go to 35's for my next set of tires so I am going to regear according to that plan. 4.56 seems to be the consensus for 35's with the 32RH but looking at grimmjeeper.com 65mph seems to sit at 2800 RPM's and 75mph around 3300 RPM's with this set up. This seems a decent bit higher than the 2500 at 65 and 3000 at 75 that people have claimed to be optimal in this thread. 4.10 gears, according to grimmjeeper, would put the RPM's almost exactly at those numbers at those speeds. This is my daily driver and I often drive full days on the highway to get to wheeling spots so I'd prefer it to be optimized for on road use but don't want to sacrifice offroad performance too much. So my question is why is 4.56 recommended over 4.10 for 35's with the 32RH. Is it better for the engine for RPM's to be slightly higher? Does it have to do with crawl ratios (which I'm not too concerned about)? Or are there other reasons? Maybe I should just shut up and listen but I like to learn and understand things and with regears costing as much as they do I want to get it right the first time.
Is there anyone who has ran this set up with these gear ratios that could share with me their experience?
4.56 w/ 35's:
4.10 w/ 35's:
2001 Sahara, 4.0L, 32RH 3 speed auto, stock Dana 30/35, 3.07 gears, currently on 33's (yes, it's a dog).
I am going to be regearing soon as well as installing a Super 35 and lockers. I plan to go to 35's for my next set of tires so I am going to regear according to that plan. 4.56 seems to be the consensus for 35's with the 32RH but looking at grimmjeeper.com 65mph seems to sit at 2800 RPM's and 75mph around 3300 RPM's with this set up. This seems a decent bit higher than the 2500 at 65 and 3000 at 75 that people have claimed to be optimal in this thread. 4.10 gears, according to grimmjeeper, would put the RPM's almost exactly at those numbers at those speeds. This is my daily driver and I often drive full days on the highway to get to wheeling spots so I'd prefer it to be optimized for on road use but don't want to sacrifice offroad performance too much. So my question is why is 4.56 recommended over 4.10 for 35's with the 32RH. Is it better for the engine for RPM's to be slightly higher? Does it have to do with crawl ratios (which I'm not too concerned about)? Or are there other reasons? Maybe I should just shut up and listen but I like to learn and understand things and with regears costing as much as they do I want to get it right the first time.
Is there anyone who has ran this set up with these gear ratios that could share with me their experience?
4.56 w/ 35's:
4.10 w/ 35's:
When I just bought my rig, it was with 33s.
I disabled the overdrive, and was running w/o it for while, using direct gear as highest gear, basically making 42RLE to operate the same as 32RH.
I had 3.73 axles, and was running fine. I had like 2700-2800RPM at 70MPH.
The issue is that you can find Dana 30 and Dana 44 combo from LJs with 3.73, so you don’t need to spend money on re gearing
I disabled the overdrive, and was running w/o it for while, using direct gear as highest gear, basically making 42RLE to operate the same as 32RH.
I had 3.73 axles, and was running fine. I had like 2700-2800RPM at 70MPH.
The issue is that you can find Dana 30 and Dana 44 combo from LJs with 3.73, so you don’t need to spend money on re gearing
Bigger tires and wheels are heavier. You want to err on the side of more gear not less.
There's only 300rpm difference at 75mph which is hardly noticeable.
We regear for street performance. The transfer case takes care of the crawl ratio.
yes ...
There are some general goals of trying to aim for a specific cruise target, for example 3000 at 75 being a decent one. However, that is typically utilized more on the transmissions with closer ratios, like the 5 or 6 speed. The 3 speed has such a wide spread that it’s better to err on the side of lower gearing to help make it less of a pig. It also helps off-road but really it helps the street more.
With 4.56 you would essentially be geared like a stock auto that came with 3.73 and 28-30” tires. You will be significantly lower geared than one of the stock autos that came with 3.07, but that’s a good thing. In this case we tend to think that the stock 3.73 3-speed setup was decent and matching it with the new tires is a decent way to go. Hence 4.56 and 35’s.
burdetter16
TJ Enthusiast
Bigger tires and wheels are heavier. You want to err on the side of more gear not less.
There's only 300rpm difference at 75mph which is hardly noticeable.
We regear for street performance. The transfer case takes care of the crawl ratio.
yes ...
Thank you! That helps me understand it a lot more. Especially the point with the 3 speed having a much wider spread. I had not thought of that before. Sorry if it was a dumb question I just like to fully understand what I'm doing and the why behind it all. I'll be going with 4.56
Thanks again!There were no dumb questions. There is a lot of old/ bad information out there regarding TJs. You are in the right place to get the correct answers.Sorry if it was a dumb question I just like to fully understand what I'm doing and the why behind it all. I'll be going with 4.56
Mike P.
Member
Thanks for all the information, everyone. My '99 Sahara (4.0L, 5-speed) is running 35" wheels on a 4.5" lift kit, and I recently spun the driveshaft and determined I am still running the original 3.73 gearing. Needless to say, I haven't won any quarter-miles.
The benefits of re-gearing to 5.13 are obvious, but my question is: are there any drawbacks I should expect other than the depletion of my bank account?
The benefits of re-gearing to 5.13 are obvious, but my question is: are there any drawbacks I should expect other than the depletion of my bank account?
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