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BBZJ 08-23-2013 02:44 PM

Gearing options. Looking for opinions.
Jeep is back on the road, going to take it on one last trip before i bed it in the garage for my winter build. Here is the core of what i'm planning:

- Regear front HP30 to ???
- IRO 3.5" Benchmark lift
- 31s
- Bunch of cosmetic work

But what to gear to.... My HP30 was 3.05 (3.08? something like that) so I'm stuck in 2wd until thats fixed. I have replacement 3.55 gears with about 30k miles on them. I know that is harder to set up than new gears.

If i go new gears I figure might as well get 3.73 and do the rear too. But now I just added another $400 to the build.

Cheap would be do the front at 3.55, but that puts me just below the regearing chart:


ajmorell 08-23-2013 02:47 PM

For 31's 4.10s are about ideal, but I don't think the cost to jump from 3.55s to 4.10s is worth it unless you plan to stay with 31" tires

eagsc7 08-24-2013 07:05 AM

The answer your looking for is in the FAQ that's STICKIED at the TOP of the ZJ Forum...

BBZJ 08-24-2013 09:48 AM

Yeah, the faq I referenced in my original post. I read it, I know it says 4.10s. What I guess I'm asking is who has ran 31s on 3.55 and what is your experience.

Or maybe you have a more thorough opinion other than read the sticky.

spidermonkey 08-24-2013 11:24 AM

Many here have run 31s and stock 3.55s with a 4.0. It's alright, but MPG's and acceleration will drop some. 33's and 3.55's are not a good idea. I ran it for a while and hated it. If you have to regear the front anyway, go to 4.10's. If you are going to a bigger tire later, go to 4.56's and be done. Just my .02.

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