Help identifying diff type

[Kylebg94]

Ok, so I'm trying to identify what type of diff I have in my 1995 5.7 tbi with the 4 speed automatic. Is it limited slip, open or what? I do not see a g80 code it. I do see a gu6 and a ton more. Any help woul be appreciated

 

[1998_K1500_Sub]

Check out this recent thread:

Thread 'What can y’all tell me about my truck from the rpo codes just looking to know if i got anything interesting'
https://www.gmt400.com/threads/what-can-y’all-tell-me-about-my-truck-from-the-rpo-codes-just-looking-to-know-if-i-got-anything-interesting.65168/

Is your truck a 1500/2500/3500?

 

[Kylebg94]

K1500

 

[Kylebg94]

Thanks on that, the gu6 is 3.42 gears. Do you know of that is limited slip or what?

 

[Schurkey]

Perhaps a moderator will move this thread out of "Transfer Cases" and into "Axles + Brakes".

Ok, so I'm trying to identify what type of diff I have in my 1995 5.7 tbi with the 4 speed automatic. Is it limited slip, open or what? I do not see a g80 code it.

No G80 = open diff unless someone changed it.

Thanks on that, the gu6 is 3.42 gears. Do you know of that is limited slip or what?

No such thing as "limited slip" on GMT400 trucks. It'd be a LOCKER or an open diff, and without G80, it's open.

K1500

With a K1500, you've almost certainly got a 10-bolt cover, 8.5" ring gear axle with crappy 254mm (10") rear drum brakes. Perfect for an upgrade to a K2500 6-lug 9.5" axle, same gear ratio, 11.x inch rear drums. Better brakes, stronger axle, simple swap. I spent years looking for one of those in a 3.42 ratio for my '88 K1500 before finding one with G80, too. The 3.73 ratio is more-common, but that means replacing the front differential and reprogramming the truck to the new gears.