Quote:
Originally Posted by calbert1999
The ZL1 rear end is definitely better than the trash on the 2010's, but, I don't think the stock ZL1 rear is anywhere close to the strength of something like a GForce 9" rear. Why do I say this? Because, a GForce will hold upwards to about 1000rwhp. there is no way GM is going to overrate their's just for the sake of being nice. If it holds 600rwhp. I'd be surprised.
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Our 9" kits now come standard with our big 31 spline Outlaw axles and huge 35 spline inner stubs. It's obnoxiously overkill for a lot of guys but some guys just want the best.
We have customers that regularly put down 1300+rwhp with our kit.
The ZR1 rear just isn't going to take that without some serious upgrades like axles, better stubs and so on.