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#1 |
Senior Member
Join Date: Sep 2004
Location: Georgia
Posts: 614
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Question about differential options
One of the options on the option sheet for my truck is code "G80 - Locking Differential". Exactly what kind of locking differentials did GM put in the trucks? Is it a straight positive traction or is it some type of limited slip? Just curious. I just picked this truck up. It has 2.73 gears in it with supposedly a locking differential, and a 700R4 tranny. I would have thought that with the 700R4 it would have had a lower geared differential. I got great gas miledge coming home with it. I wonder why?
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![]() 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado |
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#2 |
Senior Member
Join Date: Sep 2004
Location: Georgia
Posts: 614
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Re: Question about differential options
Well after doing some more searching it would appear that a limited slip and a positraction unit are both the same. It also looks like GM calls theirs a positraction unit when it is actually a limited slip. Does this sound correct?
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![]() 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado |
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#3 |
Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,906
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Re: Question about differential options
I know in the military trucks the stock locking diff is called a Gov Lock, I believe it to be the same in civilian trucks as well. Havent heard anything really good about them, but I am sure they work just fine under normal use.
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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#4 |
www.73-87chevytrucks.com
![]() Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: Question about differential options
G80 is GM's designation for a limited Slip differential. They Name they gave it was Positraction. Prior to about 1980 they used Eaton clutch diffs afterwards they went to Eaton Gov-Locs. Either will server you well in normal situations.
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Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
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#5 |
Senior Member
Join Date: Sep 2004
Location: Georgia
Posts: 614
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Re: Question about differential options
Thanks, appreciate it.
__________________
![]() 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado |
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#6 |
Registered User
Join Date: May 2006
Location: Calif
Posts: 43
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Re: Question about differential options
How did you determine that your G80 rearend had 2.73 gears?
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#7 |
Senior Member
Join Date: Sep 2004
Location: Georgia
Posts: 614
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Re: Question about differential options
It was stated on the RPO list in the glove box.
__________________
![]() 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado |
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