and you thought 4.10's were fun. swapped out the 4.10 for some 4.56's today. best mod to date. got to go thru the painful break in again, but can really feel the low end difference. traction might be an issue, need earplugs running 60mph down the highway and probably aren't going to get 15mpg. wouldn't recommend for a dd, sure are nice for the track and weekend driver.

 

what's the proper break in method for new gears? I got some oem aam 4.10s

 

3 heat cycles, 500 miles easy driving, change oil, give her hell

 

Wish I could get them for my front end. Last I checked 4.30's was the most I could do.

 

Roger, you can get 4.56's for the front of your's no problem. The easiest to get are Yukon's, but not the only choice. I have them in mine, but my tire height is 31.9". If they were any shorter, I would have prefered to stay with 4.10's with the Radix due to the wonderfull low end we have and with the 3.06 1st gear in the 65e it just blows through 1st. With the relatively tall tires, I turn about 2300 at 70mph.

 

my 29" tire and nv3500 make for a really short 1st gear. 2500 @70mph

 

I remember now. I couldn't get them in AAM gears. Something to think about later when I get bored.

 

I was looking on Ron's website and saw they have a 4.56 oem gear???? The only thing I could think of is that the Hummer H3 uses a 4.56, but I'm not sure if they use the same differentials we use.

 

I had to change out my front differential to fit 4:56's....hrm

 

i think you could DD 4.56's. my tbss run's 25XXrpm at 75 and can get around 16mpg but im awd to,2wd wwould get 17 maybe..
4.10's 30in tire,4l70e