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

  1. #1
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    Default 95 6.5L K2500 4x4 what kind of rear diff?

    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
    95 GMC Sierra 2500 4x4 6.5L turbo ext cab 6ft bed ( relocated NEW PMD with cooler, running so far so good) SOLD SOLD SOLD

    95 Chevy Silverado 1500 4x4 Z71 stepside 350V8

  2. #2
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    Default

    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.
    aka:Tim

    `91 V2500 Scottsdale Suburban:6.2 4L80E 4"Lift 35s
    `92 K3500 SLE SRW:Peninsular6.5TD Peninsular 5spd
    `72 K20 CustomDeluxe Highlander CustomCamper
    `72 K20 CheyenneSuper CustomCamper
    `72 K2500 SierraGrande
    `71 K10 CustomDeluxe 6' Fleetside

  3. #3
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    Default

    6 lugs, i'm guessing its the open diff and nothing sticking out
    95 GMC Sierra 2500 4x4 6.5L turbo ext cab 6ft bed ( relocated NEW PMD with cooler, running so far so good) SOLD SOLD SOLD

    95 Chevy Silverado 1500 4x4 Z71 stepside 350V8

  4. #4
    Join Date
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    Brighton, CO, USA
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    Default Look at your RPO codes...

    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.
    2006 Chevy K2500 LLY Duramax/Allison Crew Cab!
    1996 Chevy C2500 6.5 auto Ext. Cab LB

  5. #5
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    Default

    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??
    96 Suburban K2500 6.5L TD. High miles and daily driven (for now). Remote mount FSD with cooler, Turbo Master/Boost fooler, 4" Jardine turbo back exhaust, 2.5" cross-over pipe, Boost, EGT, & Tranny temp gauges, working on more.

  6. #6
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    Arrow

    Quote Originally Posted by 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??
    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.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  7. #7
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    Windsor, Colorado, USA
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    Default

    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.
    2002 GMC Sierra 2500HD CC D/ZF SB Fire Red 2WD no longer the fastest stocker up the hill at the TDP Pull Off. -sold-
    2004 Chevy Suburban 5.3L 2WD
    1996 GMC Sierra 1500 5.0L 5sp 2WD LB

  8. #8
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    Default

    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/store...0002_750876_-1 found this Eaton LSD for 497$, looks like it should be the right one, do these trucks have 33 spline axles? Also is PowerTrax which is a locker type set up that fits and is about 470$?
    Last edited by xtrempickup; 01-31-2007 at 17:33.
    95 GMC Sierra 2500 4x4 6.5L turbo ext cab 6ft bed ( relocated NEW PMD with cooler, running so far so good) SOLD SOLD SOLD

    95 Chevy Silverado 1500 4x4 Z71 stepside 350V8

  9. #9
    Join Date
    Jun 2006
    Location
    St. Albans, WV
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    Default

    I should have known it was not so cut-and-dry.
    96 Suburban K2500 6.5L TD. High miles and daily driven (for now). Remote mount FSD with cooler, Turbo Master/Boost fooler, 4" Jardine turbo back exhaust, 2.5" cross-over pipe, Boost, EGT, & Tranny temp gauges, working on more.

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