what would you regear to for 35's? from a stock rubi dana

 

5.13 if your profile is correct

 

It is its super lagging

 

now ive seen people with a similar setup to mine regear to 4.56 why is that? what's the difference to regear to 4.56 then to 5.13. Thanks for the info BTW

 

The automatic transmission and engine that changed in 2012. Both hp and gear ratios are different.

 

now If upgraded to 37's would the 5.13 be adequate to support those tires?

 

personally I would not run 37's on a 07-11 automatic. Many people do though and different people have different levels of acceptability in performance.

 

I have 08 was on 4:88 with 35's. It was just right. Went up to 5:13 and rpm and I had some vibration issues. Now I'm at 5:13 with 37 and it's good but the weight of the tires on my steel wheels is a bit rough. I need to take some weight out. Need to dump the steel wheels and go back to alloy.

5:38 might be better with 37's. But that's a little small on the pinion. I'm sleeved and gusseted, and trussed with chromolly in the rear on run axles.

 

I ran 37s and 5.13 on my 2011 auto and it ran great on and off road. The 3.8 is what it is, never gonna get any great performance from it unless you make some drastic improvement like SC.

 

Running around at sea level on flat ground in Florida is way different then running in the Serria's. The 5-7% grades we have out here are hard on the drivetrain. I have to drop down to 4th on my 6 speed just to maintain highway speed on 40's where in Illinois I was fine driving around everyday.