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07-15-2003, 05:33 PM
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#1 |
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Registered User
Join Date: Jun 2003
Location: Calgary AB
Posts: 110
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posi question
I've got a '70 GMC K10 with rear posi. When I'm on flat gravel I can light up both tires. But when I'm off-road and I have alot of grip with only one tire, the posi will not force it to spin, and only the other tire spins. I realize that posi is only limited slip and not a locker but I was wondering if anyone has any ideas on how to make it better. Maybe I should add some kind of spacers, stiffer springs, more clutch discs or something to make it work better? Anyone tried any of these? will it affect my street drivability if I mess with it?
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You can't get out if ya don't get in |
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07-15-2003, 09:10 PM
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#2 |
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Registered User
Join Date: Mar 2003
Location: Stillwater MN
Posts: 1,166
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It could be the clutch discs are worn in the posi, causing it to slip as you describe. A good posi will turn both tires, even if one is in mid-air! What sort of foot print does it put down with one tire on the gravel shoulder, and the other on the asphalt? If only the gravel tire spins, you need to rebuild the posi.
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69 GMC K10 ..some restoration required....still.. 
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07-16-2003, 07:06 AM
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#3 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Yea, sounds like a rebuild to me. There should be a torque spec for the posi. With a power-lock its around 200 ft-lbs to break the clutch pack loose with one tire on the ground and the other in the air. The chassis manual has the procedure.
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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 
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07-16-2003, 01:23 PM
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#4 |
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Village Curmudgeon
Join Date: May 2003
Location: Salem, OR
Posts: 75
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Before you tear things apart, make sure your really have a problem. Limited-slip differentials require periodic service and an additive to work properly.
Go to the GM dealer and get the genuine GM additive for limited-slip units. Don't rely on the gear oils that claim to already have additive for L-S. Then drain and refill with fresh oil and GM additive. You may find your problem will disappear.
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78 Chevy K30 duallie, 454, TH400 78 IH Scout II, 4X4, 345, 727TF 76 IH Scout II, 4X4, 345, 727TF 65 IH 1200C pickup, 4X4, 345, 4 spd 48 IH KB-8-F, RD-450, 5 spd, 35,000 GVW (a REAL truck) "Life is too short to drink cheap beer." Harry S. Truman 
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