HELP! might have blown rear diff! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

yfs200p · 05-13-2004, 07:31 PM

Hey you guys i think i might have blown my rear. The truck has a 3.08 posi, and it makes a loud clunk and skips when the truck is turning. It is fine in a straight line, but when you turn, the inside rear wheel stops for a second, and makes a jamming sound. please help me figure out if this is a blown rear, or maybe a smaller problem.
Thanks a million folks
PS - i may have been doing a burnout when it started happening... but you didnt hear that from me

yfs200p · 05-13-2004, 08:46 PM

Ttt Please Help!

1969 GMC · 05-13-2004, 10:41 PM

did you bother to pop the diff cover and take a look? the posi just may have worn out.

**swervin ervin** · 05-13-2004, 10:55 PM

Sounds to me like you killed the spider gears. Open it up and see what's going on in there.

Smokin86 · 05-14-2004, 12:52 AM

Right after i rebuilt my 12 bolt, it started howling on the highway and doing weird crap when I turned. I thought i had the backlash and stuff set wrong, so i took it to a shop so professionals could tell me what i screwed up. They rebuilt the rear 9 times and could never get it right. They ended up replacing everything. Works great now. Everything means everthing. The only thing that was mine that i got back was all the brake crap. The original rear is now in their dumpster.

All new bearings, seals, gears, eaton posi, and one of the shop's housings with good axles for 1200.

86-C10-V6 · 05-14-2004, 06:21 PM

This is what happens to a Gov-loc when the clutches will no longer slip. Sound like someone beating on the axle with a ball-pen hammer.
Replace the differential, Ring & Pinion may still be OK.

05-13-2004, 07:31 PM	#1
yfs200p E.H.F.D Engine #2 Join Date: Feb 2003 Location: East Hampton, NY Long Island Posts: 916	HELP! might have blown rear diff! Hey you guys i think i might have blown my rear. The truck has a 3.08 posi, and it makes a loud clunk and skips when the truck is turning. It is fine in a straight line, but when you turn, the inside rear wheel stops for a second, and makes a jamming sound. please help me figure out if this is a blown rear, or maybe a smaller problem. Thanks a million folks PS - i may have been doing a burnout when it started happening... but you didnt hear that from me __________________ -NICK '72 K10 SWB Fleetside. Avocado Highlander 350-4speed-NP205 Frame Off Re-Creation '89 GMC V3500 C/C Flatbed Plow Truck 454/SM465/Np205 '15 Chevy 2500HD CCSB High Country Duramax '22 Tahoe Premier Duramax

05-13-2004, 08:46 PM	#2
yfs200p E.H.F.D Engine #2 Join Date: Feb 2003 Location: East Hampton, NY Long Island Posts: 916	Ttt Please Help! __________________ -NICK '72 K10 SWB Fleetside. Avocado Highlander 350-4speed-NP205 Frame Off Re-Creation '89 GMC V3500 C/C Flatbed Plow Truck 454/SM465/Np205 '15 Chevy 2500HD CCSB High Country Duramax '22 Tahoe Premier Duramax

05-13-2004, 10:41 PM	#3
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	did you bother to pop the diff cover and take a look? the posi just may have worn out. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

05-13-2004, 10:55 PM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Sounds to me like you killed the spider gears. Open it up and see what's going on in there. __________________ Mike 1985 Chevy C-10

05-14-2004, 12:52 AM	#5
Smokin86 Registered User Join Date: Oct 2003 Location: Wichita Falls, TX Posts: 71	Right after i rebuilt my 12 bolt, it started howling on the highway and doing weird crap when I turned. I thought i had the backlash and stuff set wrong, so i took it to a shop so professionals could tell me what i screwed up. They rebuilt the rear 9 times and could never get it right. They ended up replacing everything. Works great now. Everything means everthing. The only thing that was mine that i got back was all the brake crap. The original rear is now in their dumpster. All new bearings, seals, gears, eaton posi, and one of the shop's housings with good axles for 1200. __________________ Joseph 1986 Silverado with some things upgraded. Currently living in Arlington, TX going to school.

05-14-2004, 06:21 PM	#6
86-C10-V6 Shadetree Mechanic Join Date: Oct 2002 Location: Youngsville, NC Posts: 100	Sounds like a Gov-loc This is what happens to a Gov-loc when the clutches will no longer slip. Sound like someone beating on the axle with a ball-pen hammer. Replace the differential, Ring & Pinion may still be OK. __________________ Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok



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