Let's Talk GMT900 DriveShafts !

[Foggy]

I'm aware of the issues with the GMT900 driveshafts that like to fail/pancake out at
higher speeds... (from what I've read, anything over 95 mph for a short distance)
Obviously we don't drive race vehicles. But I do tow heavy and when not towing have
gone a tad over the speed limit at times.

Anyway... Is there a difference from year to year ?? Mine is a 14 (last year of gmt900)
My driveshaft - REAR is made of steel and about 3.75" outer diameter. And I'm sure
it's the longest of the AWD/4WD since I have an XL model.
Of course a 2WD would have a longer one.

Let me know of info that you might have. I'm thinking I need to upgrade my shaft ! Just
don't know which way to go or IF needed for sure for my year.

 

[Marky Dissod]

What are the differences - if any - between the civilian driveshafts and the Z56-PPV driveshafts?

 

[j91z28d1]

I thought they were all aluminum. Definitely some differences then.


by pan cake, do you mean the shaft itself fails at 90? that's not great. the speed limits here are 85. I've definitely cruised past 90 before.