2000 sierra 4wd rear posi question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SkylineNXS · 02-19-2010, 04:52 PM

so yesterday i was pullin away from the curb in 2wd and the right side rear was sittin in a buch a snow, and it just sat there spinnin. Trucks got about 87k on it i think, do these posi units give out or somethin? couldnt get the truck to move, had to put it in 4 wheel. any thoughts?

Brad

V30 mongo · 02-19-2010, 05:07 PM

First off does it have the G80 option. Check the sticker in the glove box. Or if you got it used maybe the rear was changed at some time. It is possible that it needs a fluid change to "clean out" the clutch packs. The Eaton type of diffrential does have clutch packs and a lot of little parts that can get "gummed up"

SkylineNXS · 02-19-2010, 06:46 PM

Ok thanks, ill check the code, and my dad bought it new and then i bought it off him, so i kno the diff has never been touched. Ill check the code and get back.....

thanks again

brad

SkylineNXS · 02-20-2010, 02:11 AM

So i do have the G80 option, so im gonna try and see if its the fluid. Whats the easiest way to change it? do i have to remove the pumkin cover like on the older trucks?

Brad

**truckdude239** · 02-20-2010, 08:06 AM

yes. but remember just because you have posi doesn't mean your not going to get stuck. if you change the fuild please go to gm and get the fuild and special additave for the posi rear ends

Gray Ghost · 02-20-2010, 09:13 AM

Doesn't sound right for a failure at 87k. You have a locker rear axle....should have gotten the traction to both wheels equally, was the other wheel on dry pavement?

SkylineNXS · 02-20-2010, 04:02 PM

Well im not saying i wont get stuck, but like gray ghost asked, yes the other tire was on dry pavement, and was not moving at all, i was watching it while the other was just sitting there spinning....I would most likely get the service done at the dealer as i have never really done anything on rear ends before...

msgross · 02-20-2010, 04:07 PM

It's easy to change the fluid...pull the cover, use black RTV for a new seal... there will be one fill plug that gets removed and filled back up to that line...

Gray Ghost · 02-20-2010, 05:23 PM

I just thought about the fact that your G80 might be a limited slip. You can tell the difference...the locker makes a noise and a clunk when it locks up, limited slip is usually very quiet. If you had a limited slip there's probably nothing wrong with it....you were just stuck.

SkylineNXS · 02-20-2010, 05:54 PM

Hm weird, i also tried it in my driveway quick, which had snow on both rear tires, and still only one went, but it did switch sides in the beginning, so i guess it is still kinda workin, haha.

Brad

Benelli · 02-21-2010, 08:49 PM

Sounds like a limited slip if it changed.

SkylineNXS · 02-22-2010, 02:00 PM

ok cool, so is there any other way i can tell if its a limited or a locker without takin off the diff cover?

**truckdude239** · 02-22-2010, 04:36 PM

call the delaer and have them run the vin number they should be able to tell you whats in there

Gray Ghost · 02-22-2010, 05:10 PM

Let us know what you find out.

SkylineNXS · 02-22-2010, 05:15 PM

Will do, thanks guys.

02-19-2010, 04:52 PM	#1
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	2000 sierra 4wd rear posi question so yesterday i was pullin away from the curb in 2wd and the right side rear was sittin in a buch a snow, and it just sat there spinnin. Trucks got about 87k on it i think, do these posi units give out or somethin? couldnt get the truck to move, had to put it in 4 wheel. any thoughts? Brad __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

02-19-2010, 05:07 PM	#2
V30 mongo Registered User Join Date: Sep 2008 Location: wyoming pennsylvania Posts: 88	Re: 2000 sierra 4wd rear posi question First off does it have the G80 option. Check the sticker in the glove box. Or if you got it used maybe the rear was changed at some time. It is possible that it needs a fluid change to "clean out" the clutch packs. The Eaton type of diffrential does have clutch packs and a lot of little parts that can get "gummed up"

02-19-2010, 06:46 PM	#3
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: 2000 sierra 4wd rear posi question Ok thanks, ill check the code, and my dad bought it new and then i bought it off him, so i kno the diff has never been touched. Ill check the code and get back..... thanks again brad __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

02-20-2010, 02:11 AM	#4
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: 2000 sierra 4wd rear posi question So i do have the G80 option, so im gonna try and see if its the fluid. Whats the easiest way to change it? do i have to remove the pumkin cover like on the older trucks? Brad __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

02-20-2010, 08:06 AM	#5
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: 2000 sierra 4wd rear posi question yes. but remember just because you have posi doesn't mean your not going to get stuck. if you change the fuild please go to gm and get the fuild and special additave for the posi rear ends __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

02-20-2010, 09:13 AM	#6
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: 2000 sierra 4wd rear posi question Doesn't sound right for a failure at 87k. You have a locker rear axle....should have gotten the traction to both wheels equally, was the other wheel on dry pavement? __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

02-20-2010, 04:02 PM	#7
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: 2000 sierra 4wd rear posi question Well im not saying i wont get stuck, but like gray ghost asked, yes the other tire was on dry pavement, and was not moving at all, i was watching it while the other was just sitting there spinning....I would most likely get the service done at the dealer as i have never really done anything on rear ends before... __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

02-20-2010, 04:07 PM	#8
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 2000 sierra 4wd rear posi question It's easy to change the fluid...pull the cover, use black RTV for a new seal... there will be one fill plug that gets removed and filled back up to that line... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

02-20-2010, 05:23 PM	#9
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: 2000 sierra 4wd rear posi question I just thought about the fact that your G80 might be a limited slip. You can tell the difference...the locker makes a noise and a clunk when it locks up, limited slip is usually very quiet. If you had a limited slip there's probably nothing wrong with it....you were just stuck. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

02-20-2010, 05:54 PM	#10
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: 2000 sierra 4wd rear posi question Hm weird, i also tried it in my driveway quick, which had snow on both rear tires, and still only one went, but it did switch sides in the beginning, so i guess it is still kinda workin, haha. Brad __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

02-21-2010, 08:49 PM	#11
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	Re: 2000 sierra 4wd rear posi question Sounds like a limited slip if it changed. __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

02-22-2010, 02:00 PM	#12
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: 2000 sierra 4wd rear posi question ok cool, so is there any other way i can tell if its a limited or a locker without takin off the diff cover? __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]

02-22-2010, 04:36 PM	#13
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: 2000 sierra 4wd rear posi question call the delaer and have them run the vin number they should be able to tell you whats in there __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

02-22-2010, 05:10 PM	#14
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: 2000 sierra 4wd rear posi question Let us know what you find out. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

02-22-2010, 05:15 PM	#15
SkylineNXS Registered User Join Date: Oct 2006 Location: Elgin, IL Posts: 658	Re: 2000 sierra 4wd rear posi question Will do, thanks guys. __________________ 2000 GMC Sierra EXT Cab Short 4x4, finally mine... 1966 C10 SWB Fleet, 250 I6, three on the tree.... Previously Owned.... 1987 Chevy R10 "Silverado" (at least the badges were) Short Step 350 700r4.... 1972 Chevy LWB Fleet 350/350 EXTENDED CAB ALL THE WAY! .._..~...-...._...____ .._..-...______\|_\|__\____ ..-..~.\|_(O)__\|_\|__\|_(O)]



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