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Old 05-10-2015, 03:24 PM
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Gear ratio for lift

Have a question. All the jeeps I look at to buy that are new and lifted have the 3.73 read end.
I have looked at 5 lifted jeeps and not a one has the regular 3.21 gear.
All the dealers want a crazy amount for a lifted jeep still so I have given up and plan to buy one without a lift and have it done myself.
Is it best to have that 3.73 gear for a lifted jeep like the one in the pic? Or will the 3.21 do fine with a lift?

By the way that jeep still sits on the lot. They want 52 grand for it. I can buy a jeep and do the lift at a lift store cheaper.

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Old 05-10-2015, 03:28 PM   #2
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The size of the lift has nothing to do with what gear ratio you want. Gear ratios are matched to the size of the tire. Read more about gear ratios here: Regearing Basics

If you're going to do a tire swap to bigger tires and you need a gear ratio change to go with that, it's best to get a stock Jeep with 3.21 gears. No reason to pay for 3.73 gears if you're going to swap them to something else anyway.

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Old 05-10-2015, 03:32 PM
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Well duh.. Lol. A lift looks bad without tires in my opinion. I guess my question is with 35 inch tires, will a jeep perform better with that 3.73 vs the 3.21 or will it not be noticeable?
Obviously the tires will weigh a lot more that stock
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Old 05-10-2015, 03:37 PM   #4
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Most would be happier with 373 and up. When you lift eventually you'll want bigger tires. And that's when it'll help. As said lifting has nothing to do with gears. But with larger tires you'll run out of gear. Basically what this means it'll feel sluggish no power. Gears will give it back that lost power.
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Old 05-11-2015, 02:11 AM   #5
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Originally Posted by TBONE21 View Post
Well duh.. Lol. A lift looks bad without tires in my opinion. I guess my question is with 35 inch tires, will a jeep perform better with that 3.73 vs the 3.21 or will it not be noticeable?
Obviously the tires will weigh a lot more that stock
You can get down the road with 35's and 3.21's. But you lose the use of overdrive for sure and maybe even more. They're not even very good for the stock 32's. They're only really appropriate for the base model stock 29's

3.73's are almost liveable with 35's. But they are less than optimal. You'll have excessive downshifting out of overdrive if you're running in any kind of hills. I wouldn't consider running 35's with anything below 3.73's. And if I had this combo I would give serious thought to upgrading.

4.10's are at the low end of what really is acceptable for most 35's. They get your RPMs up to where overdrive is really useful on the freeway. Many people with Rubicons run 35's with the factory 4.10's and are happy.

Anything numerically higher requires a swap. But the benefit is that you're putting the engine RPMs into the more optimal range.

4.56's are what most people find truly optimal. They give you the best overall performance in most conditions.

4.88's are also a good choice. RPMs start to get a bit much for optimum fuel economy but you get better performance at higher altitude and your crawling performance is improved.

Beyond that, you're getting into ratios that are better suited to off road than on.
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Old 05-11-2015, 08:19 AM
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Ok well great feedback. I will say I was REALLY impressed with the 3.6 motor. I was wondering how it holds when you add those tires though. Didn't know if it had enough low end to carry her down the highway. Sounds like the 3.73 is a MUST at the least. Even if I didn't add the tires, sounds like the jeep will like that gear a lot better so might as well get the trailering package so I get that gear.
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Old 05-11-2015, 09:36 AM   #7
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The 3.6 is a top end motor. It's pretty gutless under 2000 RPM. Though not as bad as the older 3.8. It's happy when you keep the RPMs in the mid 2xxx range on the freeway.

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