Rear End Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72BlckButy · 08-10-2005, 07:44 AM

I was trying to determine what kind of rear end I have, so recently I picked up a new rear end cover, might as well kill two birds with one stone. While proceeding to put it on, I put the rear end of the truck on jack stands. While on jackstands, I spun the right rear wheel.....click.click.click, and the left tire isn't spinning. So I turn it towards the back, click.click.click.....and the left tire kind of spins backwards. I move to the left wheel....turn the wheel forwards....click.click.click....and the right tire spins forwards, as well as turning the wheel backwards.

Any ideas why?

Also, to give a little more information, when I turn corners, I hear clicking out of each turn. I've asked a lot of people and they say that it's probably a posi.

68C15 · 08-10-2005, 07:55 AM

sounds like either a worn out ratchet style locker or a gov-lock grenade

roger0080 · 08-10-2005, 08:41 PM

Is this a 1/2 or 3/4 ton?

Do you know that you have a posi or locker in it for sure?

If it is 3/4 ton you probably have a No-Spin locker in it.
They should make some noise when cornering.
If it is a 3/4 ton and you hear the clicking while it is jacked up as you describe, I would venture a guess to say that something is worn inside that allow the locker to unlock too easily. Both wheels should turn. Just my thoughts. Not an expert on the No-Spins.

**JIMs70GMC** · 08-10-2005, 09:11 PM

Was the truck in gear when you were spinning the tires?

72BlckButy · 08-11-2005, 07:48 AM

No, it was in neutral, which now thinking about it, would have made a difference. It is a 1/2 ton, and in speaking with some buddies here locally, I think that I have locking diff. However, I'm still not 100% positive that that's what I have. Probably not the smartest thing to do, but after checking out the rear end on Tuesday, I took it out on the street and brake torqued it a little, and she left dual tire marks, so I'm still not sure what I'm running.

68C15 · 08-11-2005, 07:52 AM

pull the cover & post a pic or 2.

08-10-2005, 07:44 AM	#1
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Rear End Problems I was trying to determine what kind of rear end I have, so recently I picked up a new rear end cover, might as well kill two birds with one stone. While proceeding to put it on, I put the rear end of the truck on jack stands. While on jackstands, I spun the right rear wheel.....click.click.click, and the left tire isn't spinning. So I turn it towards the back, click.click.click.....and the left tire kind of spins backwards. I move to the left wheel....turn the wheel forwards....click.click.click....and the right tire spins forwards, as well as turning the wheel backwards. Any ideas why? Also, to give a little more information, when I turn corners, I hear clicking out of each turn. I've asked a lot of people and they say that it's probably a posi. __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) Last edited by 72BlckButy; 08-10-2005 at 07:51 AM.

08-10-2005, 07:55 AM	#2
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	sounds like either a worn out ratchet style locker or a gov-lock grenade __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

08-10-2005, 08:41 PM	#3
roger0080 Registered User Join Date: Nov 2000 Location: Carver County, Minnesota, USA Posts: 626	Is this a 1/2 or 3/4 ton? Do you know that you have a posi or locker in it for sure? If it is 3/4 ton you probably have a No-Spin locker in it. They should make some noise when cornering. If it is a 3/4 ton and you hear the clicking while it is jacked up as you describe, I would venture a guess to say that something is worn inside that allow the locker to unlock too easily. Both wheels should turn. Just my thoughts. Not an expert on the No-Spins. __________________ 72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71...

08-10-2005, 09:11 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Was the truck in gear when you were spinning the tires? __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-11-2005, 07:48 AM	#5
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	No, it was in neutral, which now thinking about it, would have made a difference. It is a 1/2 ton, and in speaking with some buddies here locally, I think that I have locking diff. However, I'm still not 100% positive that that's what I have. Probably not the smartest thing to do, but after checking out the rear end on Tuesday, I took it out on the street and brake torqued it a little, and she left dual tire marks, so I'm still not sure what I'm running. __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

08-11-2005, 07:52 AM	#6
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	pull the cover & post a pic or 2. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card



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