So the 3.21's kinda suck in case you guy's hadn't heard yet. I'm looking to regear but I'm having second thoughts about spending $1500 plus on 4.56's to have them be a little too low for my needs. I live in New Jersey and for any of you that don't live here if you're going 75 in a 65 on the highway you're getting passed by grandma on her way to bingo. So what RPM's are you guys seeing with 4.56's and 33's or 35's in 6th in a 2012 at around 75mph? Same with 4.10's.

 

I'm running 4.10's with 35's and my rpm's at 75 are about 2200. I have no desire to regear the Jeep is running great.

 

I am a little confused but I am assuming you are jumping from 3.21's to 4.10/4.56s

Its going to cost the same to go to 4.56's as it would to go to 4.10's so I would just make the jump to 4.56... it would really suck to spend that much money to go to 4.10's and then decide you wish you went to 4.56. Its like buying a TV, you should get one step up from the size you think you need.

If you already have 4.10s and I misunderstood you I don't think it would be worth the money to regear.

 

I have 3.21's. It isn't a matter of price, 4.10's for a dana 30 front would probably end up being more expensive since they are less common. I don't want the engine to rev too high at 75-80mph in 6th i.e. higher than 2500 rpms. Going 65-70 at 2500 rpm's in the right lane isn't an option either. I'm thinking 4.10's are probably the way to go for my purposes, it would put me into the green on the rpm chart which is somewhere I haven't been since owning this jeep.

 

Any one running 4.56's on a 33x12.5?

 

Help me out with this. They say if you rotate the back tire twice and your drive shaft goes around less than four times you have 3.73's. Thats just what mine was, just less than four times. I guess just over four times is 4.10's. My issue is RPM's. When people say the rpm's they are hitting doesnt line up with mine. I have 35's and at 73 mph I'm at 2500 rpm's on the dot. I picked 73 because I was going by the rpm's. I went up to 2500 and looked at the speed. And GPS to back it up. now how can that be. It doesnt match any chart or what other people are saying they get? I took for readings going by the RPM and than looking at the speed. Here they are 60 = 2050 rpm / 65 = 2200 rpm / 73 = 2500 rpm and 80 mph = 2700 rpm.