My Envoy is equipped with a GM 8.0" 10-bolt rear axle and a 3.73 (RPO GT4) ratio. Lately, I've started noticing some faint whining/howling at highway speeds, which goes away if you cut the throttle/disengage cruise control, so I'm going to have it professionally rebuilt.
While I'm going to stick with the factory 3.73 ratio, I'm looking at a helical limited slip differential, such as the Torsen T-2 I have in both my Fords. Torsen does not make one for this application, but Eaton has the Detroit TrueTrac 912A654.
I'm also looking at Yukon Gear for the ring and pinion gear. It is about $100 more than Genuine GM, and many seem to swear by it, but is it really any better? Wondering if anyone in the know has suggestions or recommendations before I start buying parts.
While I'm going to stick with the factory 3.73 ratio, I'm looking at a helical limited slip differential, such as the Torsen T-2 I have in both my Fords. Torsen does not make one for this application, but Eaton has the Detroit TrueTrac 912A654.
I'm also looking at Yukon Gear for the ring and pinion gear. It is about $100 more than Genuine GM, and many seem to swear by it, but is it really any better? Wondering if anyone in the know has suggestions or recommendations before I start buying parts.