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mcmlxix · 08-30-2013, 09:19 PM

OK, so the rear is making noise ... I would like to replace GM unit rather then rebuild it... what are my options... best solution without costing a million bucks... needs to be done in the next week or so....

I think I want a Detroit Truetrac ... not sure about the part number. I got a list of RPO codes from the dealer and I didn't see the G80 posi unit listed and it doesn't have the HD tow package...

I think this is the one.... GM 8.5 Detroit Truetrac Posi Differential 30 Spline: P/N 913A481

08-30-2013, 09:19 PM	#3
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	Re: New to me 08 Sierra RCSB OK, so the rear is making noise ... I would like to replace GM unit rather then rebuild it... what are my options... best solution without costing a million bucks... needs to be done in the next week or so.... I think I want a Detroit Truetrac ... not sure about the part number. I got a list of RPO codes from the dealer and I didn't see the G80 posi unit listed and it doesn't have the HD tow package... I think this is the one.... GM 8.5 Detroit Truetrac Posi Differential 30 Spline: P/N 913A481 __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE Last edited by mcmlxix; 08-31-2013 at 03:06 AM.