What gear are you running 4.0, auto 3 speed, 33's - JeepForum.com

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post #1 of 26 Old 08-04-2010, 07:39 AM Thread Starter
pkemper1
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What gear are you running 4.0, auto 3 speed, 33's

I'm going to gear the jeep in fall and was wondering what some people had for gears with the same set-up as mine. I have a 2001 tj 4.0, 3 speed auto, 33 12.5 dana 30 and 35. It's a daily driver with light offroading (no mud).

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post #2 of 26 Old 08-04-2010, 07:46 AM
TheBoogieman
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I wouldn't go higher than 4.56's or it will rev high on the highway.Maybe just slap in some 4.10 geared axles from a junk yard.
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post #3 of 26 Old 08-04-2010, 07:47 AM
Ghaniba
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Rumor is 4.56 is the preferred gearing for 33's and the 32RH.

Just because someone has to say it...

You can replace your rear d35 with an 8.8 for under a grand. Considering you're probably going to spend close to $500 to regear it... it's something to consider.

Complete Ford 8.8" Rear Axle Assembly Jeep TJ Ready to Bolt In Axle Swap

I felt the need to preach since I considered my starting light wheeling too, until I broke my D35 axleshaft and caused great headaches for those I was with that day.

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post #4 of 26 Old 08-04-2010, 07:47 AM
snowrydr01
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i have the stock 3.73s and with 31s i think its perfect, using that logic a 4.10 would land you in the same rpm ranges for offroad and highway use. If it sees less highway and more offroad you might be better of with a 4.56 but you would be screaming on the highway
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post #5 of 26 Old 08-04-2010, 07:56 AM
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Due to you not having an OD, 3.73 would really be best. 4.10 would work great but you'd be spinning higher RPM's on the highway. No big deal. Either way, try to find a set of axles from another TJ instead of paying for new gears.

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post #6 of 26 Old 08-04-2010, 08:04 AM
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Ghaniba is spot on. Go with a junk yard Ford 8.8 rear axle with 4.10 gears. I ran this set-up with 33s and it worked great. I would run about 2800 RPMs at about 60MPH with my 3spd auto. I just went to 35s with this set-up and I'm still happy with my acceleration.
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post #7 of 26 Old 08-04-2010, 08:15 AM
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I'm running 4.10's with that same trans/tire combo. It's great off road, and pretty decent on the highway. As stated about you'll run about 2800rpm at 60mph. Which puts you in a good place as far as the power band of the engine is concerned. Just expect to burn a little more fuel because of the higher rpms.

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post #8 of 26 Old 08-04-2010, 08:33 AM
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I have 4.10's and at 70mph it's turning a hair over 3,000 rpms. 4.56 with a 32RH in a daily driver would not be any fun at all unless you never have to get on the interstate.

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post #9 of 26 Old 08-04-2010, 06:51 PM
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4:10 gears would work well for you...IMO
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post #10 of 26 Old 08-04-2010, 06:55 PM
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I'm running 4.10 gearing and I am happy with the performance both on and off the road.


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post #11 of 26 Old 08-04-2010, 07:07 PM
JohnW720
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got a question about this too. Im going to school in upstate new york and the ride there is all up and down mountains. Im getting 33x12.50 dunlop muds and was wondering if 3.73 or 4.10 would be better for the mountains.
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post #12 of 26 Old 08-04-2010, 07:33 PM
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I am running 4.56 with the 32RH and 33 in Duratracs. It spins on the highway but the get up and go is really nice. If It was a DD and I never considered going to 35's I would have done the 4.10's.
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post #13 of 26 Old 08-04-2010, 07:38 PM
Jerry Bransford
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For the 3-speed automatic and 4.0L engine, 4.10 is appropriate for 33" tires and 4.56 is appropriate for 35" tires.

My TJ had 4.88 gearing and 35" tires when it had its OE 5-speed transmission. I converted it to the 3-speed automatic and its existing 4.88 gearing stayed. That ratio was too low for my 35" tires after installing the 3-speed automatic. I had to stay in the slow lanes because I had to slow down my highway speed to keep the engine rpms reasonable. 4.56 for my 35" tires would have been ideal but I wasn't going to pay again to regear it to 4.56. So 4.56 with 33" tires and the 3-speed automatic would be too low of an axle ratio, that combination would be just like my 4.88 with 35" tires.

Go with 4.10 for 33" tires and your 3-speed automatic, you won't be disappointed or have excessively high or low highway engine rpms.

Gone wheeling, back Sunday evening.

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post #14 of 26 Old 08-04-2010, 08:47 PM Thread Starter
pkemper1
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thanks for all the replies. I was thinking 4.10 but wanted more info from people that had done it.
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post #15 of 26 Old 08-04-2010, 09:01 PM
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My 4.0, 32RH Sahara is my daily driver, and I do quite a bit of highway driving, so I went with 3.73's. I haven't regretted it.

"It always seems impossible until it is done." -Nelson Mandela


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