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Old 01-11-2010, 11:13 PM   #1
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Gears recommendation ?

So I have a 2001 Jeep Wrangler 3 spd auto with the 4.0 engine.. 33"s 3" lift. This thing only gets 10-12 mpg. I was looking to get a lil bit more performance out of it by installing some new gears. What do I currently have? What recommendation if I should upgrade?

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Old 01-11-2010, 11:28 PM   #2
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I'm having the same problem with my 4.0L with a 4in lift and 33's. It's a standard and i was told 4.56 would work best. Since you have a automatic it might be different. 4.10 gears might work best. Hopefully someone else can give u a little more info on here.

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Old 01-12-2010, 12:01 AM   #3
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You in all likelihood have 3.73 gears in that jeep. Might be 3.07 though. Check the diff cover. On the left side there should be a tag. Clean it if you can't read it and it'll tell you what gears you have.

Assuming you have 3.73's and now 33" tires, 4.56 won't quite get you back to the stock ratio and 4.88 will get you "over" the stock ratio. So, either will work and most would select 4.88. (that's what I'd do).

Depends on what you want...slightly better highway MPG and don't ever plan to go bigger tires..4.56

Better (that 4.56) low end and a gear that will allow for 35's...4.88.

Oh, and what diff do you have? Easiest check is: Rubber plug = D35 and metal plug = D44. The dana 35 has been (widely) known to grenade with larger tires, especially while wheeling. Something to consider.
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Old 01-12-2010, 12:02 AM   #4
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Quote:
Originally Posted by bbnate View Post
So I have a 2001 Jeep Wrangler 3 spd auto with the 4.0 engine.. 33"s 3" lift. This thing only gets 10-12 mpg. I was looking to get a lil bit more performance out of it by installing some new gears. What do I currently have? What recommendation if I should upgrade?
i have 33's a 4 inch lift and im running 4.88's in both the front and rear axle. i get into the mid to high teens gas mileage wise. do you know what kind of axles you have? if you dont this link should hep you out. Axle Identification Chart
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Old 01-12-2010, 02:00 AM   #5
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youre not getting 10-12mpg. Thats with like 35's youve got to realize your speedometer is probably way off and youre getting liek 15 mpg or so. But still I dont know what you would need, I believe its 4.56 possibly 4.10
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