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02-04-2007, 11:05 PM
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#1 |
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Wishin' I had more money!
Join Date: Feb 2007
Location: Eugene, OR
Posts: 1,242
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What rear end gearing do I have?
My truck is a 1980, came from the factory with a 350-4bbl/TH350. It's got a 12 bolt rear end, not sure if that's original though.
How would I find out what gears I have in the back? |
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02-04-2007, 11:52 PM
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#2 |
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The Crazy Machanic
Join Date: Jan 2007
Location: Nokesville Va
Posts: 1,437
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Re: What rear end gearing do I have?
look in the glove box it should still have a paper tag telling you if not beats me also i think it might be on the driver door
Last edited by Srubydo1986; 02-05-2007 at 12:21 AM. |
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02-05-2007, 06:00 PM
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#3 |
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www.73-87chevytrucks.com
 
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: What rear end gearing do I have?
If it is anything but standard it will be listed in the glove box in the RPO section, if it is standard, it is most likely 3.08. There is a stamping on the axle, but I don't have the codes to decifer them...
__________________
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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02-05-2007, 06:10 PM
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#4 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: What rear end gearing do I have?
I have the codes for the ring gear numbers but you have to take the cover off....
__________________
The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
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02-05-2007, 06:31 PM
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#5 |
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www.73-87chevytrucks.com
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: What rear end gearing do I have?
If you get in that deep you can just read them off the ring gear and divide them to get the ratio.
__________________
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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02-05-2007, 08:43 PM
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#6 |
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Wishin' I had more money!
Join Date: Feb 2007
Location: Eugene, OR
Posts: 1,242
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Re: What rear end gearing do I have?
I'll just look at the RPO sheet. I don't think the 12 bolt came on the truck from the factory, but I'll just assume that it did!
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02-05-2007, 10:42 PM
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#7 |
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The Crazy Machanic
Join Date: Jan 2007
Location: Nokesville Va
Posts: 1,437
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Re: What rear end gearing do I have?
from what i was told the 2500 2wd did have a 6 lug 12 bolts but i think it was in a later models not our years
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02-05-2007, 11:10 PM
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#8 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: What rear end gearing do I have?
my 68 4wd has 12 bolt with 3.73's
__________________
The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 02-05-2007 at 11:10 PM. |
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02-06-2007, 12:00 AM
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#9 | |
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www.73-87chevytrucks.com
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: What rear end gearing do I have?
Quote:
12bolts came factory on all 73-80's. 10bolts started showing up in 81 and 12bolts were gone by 82...
__________________
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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02-06-2007, 01:50 AM
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#10 | |
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Wishin' I had more money!
Join Date: Feb 2007
Location: Eugene, OR
Posts: 1,242
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Re: What rear end gearing do I have?
Quote:
Oh! Then I'll look at the RPO sheet tomorrow and find out! Thanks! |
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