Originally Posted by SUX2BU
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- 1/3 of SS was upgraded/improved for ZL1. The tranny is probably the same (or very
closely related) as CTS-V's (the same goes either A6 or M6). The rear is a new cast-iron case with probably a 14-bolt differential. The rear cradle bushings have also been improved.
That's a scratch on the surface of what's been improved for ZL1
05 Hummer H2 SUV on OEM Air Ride
Forged 11.1:1 408 LQ4 (K1 crank & rods; Mahle pistons)/CPP LS3 CNC heads/BTR Stage IV LS3 cam and valvetrain/home ported L92 intake manifold/ported 90mm TB/custom Volant CAI/mid-length headers/AFE dual 3" CB/Corvette Servo/el cheapo lift/Cognito UCAs/e'fan conversion/aluminum radiator/Moroso catchcan/HPTuners by me/LED exterior lighting/Pioneer AVH-5600BHS/Pioneer GM-9601/2-Pioneer TS-W310D4/Obcon Labyrinth dual-12 box/lots of other stuff