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03-24-2004, 05:38 PM
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#1 |
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Registered User
Join Date: Dec 2002
Posts: 2
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posi rear popping
just put a 3.73posi rear out of my dads 67 short bed,dont know if this is a problem but every so often there is a loud bang,sounds like a big boulder hit the underside of the bed. Does this sound normal?? Any suggestions??
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03-24-2004, 05:45 PM
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#2 |
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Registered User
Join Date: Jul 2001
Location: North Louisiana
Posts: 4,501
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Did you add posi- additive to the gear oil? I had that problem once. Popped when I turned. Added the additive from the dealer and it quit. I'm not sure what the name of the stuff was, but I think you can get it at NAPA also. Welcome to the board from Louisiana, btw.
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Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com |
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03-24-2004, 10:10 PM
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#3 |
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Senior Member
Join Date: Apr 2001
Location: Amazonia, Mo. USA
Posts: 2,821
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Posi plates are like a waffle. 99% of your driving will be in forward so the material from the friction discs will build up on one side of the waffles. The best method to correct this is; Purchase the GM rear diff. additive. Also enough lube to refill the case.
Go to a large parking lot and drive several figure 8's in reverse. This spins the plates in a reverse direction and will break some of the buildup free. It is now suspended in the fluid. Drain the lube. Refill and add the GM additive. Happy driving.
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72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide |
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03-24-2004, 11:45 PM
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#4 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Welcome to the board from South Mississippi!
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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03-24-2004, 11:53 PM
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#5 |
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ran out of money
Join Date: Apr 2003
Location: northern, NJ
Posts: 925
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sounds like you either need the additive or your posi is close to being kicked.... my tahoe makes a noise around turns and going straight sometimes.... almost sounds like a locker or spool is in the rear
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Modify everything, leave nothing alone!~  
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03-24-2004, 11:53 PM
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#6 |
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ran out of money
Join Date: Apr 2003
Location: northern, NJ
Posts: 925
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sounds like you either need the additive or your posi is close to being kicked.... my tahoe makes a noise around turns and going straight sometimes.... almost sounds like a locker or spool is in the rear
__________________
Modify everything, leave nothing alone!~
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