Am I correct in understanding that the G86 is just the standard open differential? I am suprised my truck didn't come with the G80 since it came with just about everything else attached to it. Anyone know of any potential problems with putting a locker into a quadrasteer??

 

I think the G86 is a limited slip diff (clutches w/ preload spring/s), the G80 is the locking diff (locks after so much wheel spin).

When I "built" my 2500HD Duramax online it gave me both options. Look close, I am almost certain the G86 is better.

 

Okay, well that would make sense. Would I be able to hear noise from the clutches if I were to spin the tires? Something in the rear end is making a clunking type noise. I am hoping the quadrasteer isn't breaking already with only 2k miles on it.

 

NO! A clutch type LSD (Eaton for isntance or Ford's Trac-Lok) is quiet and smooth with 200-400lbs preload springs, maybe even up to the 800lbs springs.

Q-Steer seems nice but I am too weary to get that on the 2500HD I plan to order. Just came out, too much crap to break...espically on some 2Hi launches w/ slicks in the Diesel. I am just gonna get the same suspension that's on my Z71 now...Ride Control and AutoTrac transfercase.

 

Hehe, I don't have to worry about launching in 2hi since I have the all wheel drive. I was scared of the quadsteer but the techs at the GMC dealer said that there had been no reported problems with it up here. Since we see a lot of below zero temperatures I figured if they were going to be junk that we would have already seen some breakage. Well I guess I need to take it in to have the clunk looked at.

 

Can't get QuadraSteer on a 2500HD.
Can't get Ride Control or AutoTrac either.

 

Go build an SLT GMC 2500HD Sierra on www.gmc.com ...it's there. This is on '03+ vehicles. 02 and older couldn't get them.

You can also option for 4.10:1 gears in a Duramax now too!

 

GMC's website is wrong.