95 6.5L K2500 4x4 what kind of rear diff?

[xtrempickup]

I was wondering what kind of rear diff is in my stock 95 6.5L 2500 Sierra 4x4 because I've been looking at the HD2500 trucks and they come with a posi rear. Not sure if mine is just a regular open diff or if its some sort of weak limited slip. can anybody tell me. what kind of options do i have for making it a posi rear? make just get the diff from a newer 2500 HP truck and make it work with the right gear ratio

[C.K. Piquup]

Do you have 6 or 8 lugs(14-bolt semi-floating)?There were light and heavy 2500s.If 8,does the rear hub stick out like a front hub on the old-style 4wds(14-bolt full-floating)?It cold be open or could be the Gov-Loc,as limited-slip/locking diff.

[xtrempickup]

6 lugs, i'm guessing its the open diff and nothing sticking out

[joed]

Being a 6 lug, you have a semi-floater, but could still have a locker.

For the locker, the easiest way to tell is to look up your codes on the glovebox sticker. Look for a code "G80" - this indicates you have the factory locking differential. You can also tell gear ratio, GT4=3.73, GT5=4.10, GU6=3.42, etc.

Also, I'm not sure the newer HD trucks automatically come with a locker, just seems that most are equipped that way.

Hope that helps.

Joe.

[Shikaroka]

Huh.....
It's a 3/4 ton (2500), right? I thought 3/4 tons were 8 lug, and I thought all the diesel trucks were 8 lug. I guess I was wrong??

[DmaxMaverick]

Huh.....
It's a 3/4 ton (2500), right? I thought 3/4 tons were 8 lug, and I thought all the diesel trucks were 8 lug. I guess I was wrong??

LD (Light Duty) is 7200# GVWR, and semi-floater 6 lug r/e. Also equipped with the same smog as the 1/2 tons in most states.

HD (Heavy Duty) is 8600# GVWR, and full floater 8 lug r/e.

However, I've seen factory LD's with 8 lug full floaters, too, with no rhyme or reason for it, and the same RPO's as the LD's.

2500 Suburbans were all 8600 GVWR.

[Colorado Kid]

And just to cause further confustication 1500 Suburbans with 6.5 Diesel engines had 8 lug wheels and the semi-floater 9.25" 14-bolt.

[xtrempickup]

yea it is confusing as i thought all the 2500 and up trucks had 8 lug. when i got this is was very surprised, i just sold my gas with a 6 lug with new tires on AR wheels that I could have used. oh well, i'll check the glove box codes and see. I see GT4 which i guess means my gear ratio is 3.73. Rear is 14 bolt. Is that any good with the 305/70/17 in tires that I have on? No code for a limited slip, I guess might just be the standard crappy rear. Any idea what to look for if i go to a junkyard like in gas and diesel trucks to find a factory locker or posi rear? http://www.jegs.com/webapp/wcs/stores/servlet/product2_10001_10002_750876_-1 found this Eaton LSD for 497$, looks like it should be the right one, do these trucks have 33 spline axles? Also is PowerTrax which is a locker type set up that fits and is about 470$?

[Shikaroka]

I should have known it was not so cut-and-dry.