Best Gear Ratio For 32RH? - JeepForum.com
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post #1 of 10 Old 07-28-2019, 07:31 PM Thread Starter
53flattie
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Best Gear Ratio For 32RH?

Instead of selling my current Ď99, and buying a Rubicon, Iíve made up my mind to keep it and just swap in a D44 rear and regear (the set of Rubicon axles I mentioned a few weeks ago sold before I got in touch with the seller ).

My question is - what gear ratio to run with 32ís (which measure at 31Ē) and the 32RH (no overdrive)?

I have a friend with a set of 4.56 R&Pís that I can get for free. That was my original plan. But after reading several threads on this topic, Iím starting to think that might be too low. According to the interwebs, 4.56 would put me at 3200 RPM at 65mph. That seems a little high to me...

Would you guys disregard the free 4.56ís and just buy a set of 4.10ís (2900rpm at 65) and go that route? Or should I drop all the way back to 3.73 (2600rpm at 65)?

I donít rock crawl. Mostly highway with a few forest service type roads a few times a year. And I donít plan on going any larger on tire size.

Thanks!


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post #2 of 10 Old 07-28-2019, 08:46 PM
UTWeezul
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I run 4.56s and 35s with the 32rh. Chances are if you find a TJ 44 it will be 3.73 unless it has been regeared. I ran 33s and 3.73s for a few years before I went to 35s.
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post #3 of 10 Old 07-29-2019, 12:17 AM
TheBoogieman
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3.73 or 4.10 would be fine with that tire size. I ran 4.56 with 32s and the rpms were very high at highway speeds. With that trans, usually 4.10 for 33s and 4.56 for 35s.

p.s. Your profile says you have a 97' 4 cylinder.

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Originally Posted by jeepinmichguy_ View Post
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03' Rubicon/Zone 4" coils with 1" spacers up front/Rancho shocks/5.13 gears-35" MTZs/Black Magic brakes.
99' XJ /4.0L-AW4/ 5.5" lift / Rancho RS5000X shocks/33" DC Extreme country MTs. Jeep #18
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post #4 of 10 Old 07-29-2019, 05:29 AM Thread Starter
53flattie
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Quote:
Originally Posted by TheBoogieman View Post
3.73 or 4.10 would be fine with that tire size. I ran 4.56 with 32s and the rpms were very high at highway speeds. With that trans, usually 4.10 for 33s and 4.56 for 35s.

p.s. Your profile says you have a 97' 4 cylinder.


Thanks for the advice.

(And thanks for the reminder about my profile - I updated it)


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post #5 of 10 Old 07-29-2019, 07:25 AM
JPPCAR
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I had 32" with the same Trans and 3.73 gearing and it was great for the Hwy. If you are going to do any wheeling go with 4.10 but your fuel will suffer since there is not OD.
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post #6 of 10 Old 08-01-2019, 07:37 AM
Davidgoodman
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I have a 97 with the 32RH. I am currently on 31's. I asked the same question on here, based on the advise I got I went with 4:10s.
Very happy with the results this gave.
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post #7 of 10 Old 08-01-2019, 09:51 AM
Wheelin98TJ
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I would go with 4.10 in your situation.
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post #8 of 10 Old 08-01-2019, 10:08 AM
Trevlaw
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32rh on 33" duratracs that run close to 32" or less. I'm running 4.56 as I thought I'd move up to 35s a lot sooner than I have. I run 3200 rpm at about 65 or so and that's usually where I cruise, but can go faster for passing. I really like the extra torque of being geared one step over what the 4.10 stock equivalent is. It's no speed demon on the highway, but it pulls up hills very well and is more fun to drive pretty much everywhere vs when I was on 31s with 3.73s.

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post #9 of 10 Old 08-01-2019, 10:32 AM
Wheelin98TJ
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Quote:
Originally Posted by Trevlaw View Post
32rh on 33" duratracs that run close to 32" or less. I'm running 4.56 as I thought I'd move up to 35s a lot sooner than I have. I run 3200 rpm at about 65 or so and that's usually where I cruise, but can go faster for passing. I really like the extra torque of being geared one step over what the 4.10 stock equivalent is. It's no speed demon on the highway, but it pulls up hills very well and is more fun to drive pretty much everywhere vs when I was on 31s with 3.73s.
I did the same, 32rh with 4.56 and 33" tires that I later swapped for 35" tires.

It sure was a lot more fun to drive with the 33s.
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post #10 of 10 Old 08-02-2019, 12:13 PM
noise_maker
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It all depends on how much highway time you expect with it and your longer term goals with the jeep. re-gearing is one of the best things you can do but it is also expensive

If you are setting them up yourself remember used gears are a little harder to setup right then new ones because you really should get it back into the same pattern it was in before, you have a little more lea-way with new ones. its a time consuming process - not all that hard but you need a few tools not everyone has (dial gauge, calipers, press, and something to make some setup bearings that are easier to get on and off. your first time around you will put it together /tear it apart several times more then you want to in order to get it right. )

If you are paying someone to set them up for you - its a costly process around 600-900 in labor for most of places. So think about where you want to be with your jeep. if your plans are to lift it more and run bigger tires - maybe go a little deeper then you need right now and slow down to 65 on the highway until then. Don't be terribly afraid to buzz 4.0 (or 2.5) though. They do reasonable at higher RPMs

like others have said
If you do allot of highway you want 3.73s or 4.10s with 32/33s i swapped in a set of 3.73s axles when i had 33s and it was ok on my 2000 4.0 32rh but could have been a little deeper.

when i went to 35s i built out a ford 8.8/hp30 with 4.88s - that was a little deep but drive able for 35s on the highway but allot of fun to drive off road and tooling around.

since then that jeep got a set of 38 TSLs. 4.88s are decent in that setup but i miss the pep she had with 35s, she is also a trailer queen now.
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