The 6L80E will certainly help put those gears to good use. Yeah, I have had several situations where I was in one of our 2500s (LY6, 3.73, 33s) and it didn't even have enough power on sand to bury itself; all it would do is rev to a couple grand and sit there. I can imagine the same truck minus several hundred pounds with the gearing from the 4L70E.

 

AAM should be what you want OP

 

found them for $350 a set. Chevy GM 8.25 IFS 4.11 Ring & Pinion OEM AAM Gear Set [GM8.25-411R-OE] - $329.00 : JTs Parts & Accessories, Justdifferentials.com
The fronts are 4.11 and the rears are listed as 4.10. there both 41 10 teeth so is this a problem.

 

Just how much fun will I be having with 4.11 gears? is it like adding ??hp? is it going to be almost a camaro fun?

 

Is Yukon gears any count? Not to steal a thread just to inform us both

 

It won't be like a Camaro; the truck still has over 1500 pounds on the SS. However, the L92/L9H really likes a little rpm; the gears will help it stay in its powerband and really boost your torque vs your current 3.42s.