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10-06-2009, 09:20 AM
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#1 |
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Registered User
Join Date: Oct 2009
Location: Janesville, WI
Posts: 18
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Rear Gear Info??
Some of you have touched on this already, but how do I determine the rear gear on my 71 C-10? It isn't located on the sheet on the glove box door. I believe it isn't located there because it isn't a special option, as it has the standard stock gear. Any help? - what was the std gear in 71 for a 350ci 1/2 ton? Is there numbers located on the outside of the rear end that I can decode?
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Gas flows from more places then my rear.... |
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10-06-2009, 09:40 AM
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#2 |
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Account Suspended
Join Date: Jan 2009
Location: galt ca,
Posts: 749
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Re: Rear Gear Info??
there might still be the ratio tag on the diff cover.
you can jack up one wheel and turn it 2x and count how many time the drive shaft turns. pull the diff cover off and count the teeth or find the stapmed ### and do the math search, it is coverd, alot. |
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10-06-2009, 09:42 AM
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#3 |
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Registered User
Join Date: Oct 2009
Location: Janesville, WI
Posts: 18
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Re: Rear Gear Info??
Where can I find the number decoded for 1971 numbers stamped on the axle?
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Gas flows from more places then my rear.... |
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10-06-2009, 10:08 AM
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#4 |
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Spanked once
 
Join Date: Oct 2006
Location: Intheshop, Indiana
Posts: 969
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Re: Rear Gear Info??
2 ton pretty much covered it , another thing would be tach readings. Mine was the same truck as yours and was stock with 308 gears.
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The ole 350 budget build. |
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10-06-2009, 11:03 AM
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#5 |
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Registered User
Join Date: Oct 2009
Location: Janesville, WI
Posts: 18
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Re: Rear Gear Info??
Mine has these numbers stamped on the outside:
Pass side forward facing - NF 3896838 Drivers side forward facing - GM 59 Drivers side rear facing - C221 Pass side rear facing - 1260?7890 These mean anything to anybody?
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Gas flows from more places then my rear.... |
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10-06-2009, 04:48 PM
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#6 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
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Re: Rear Gear Info??
It would have come with 3.08s.
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Tim |
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10-06-2009, 11:20 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Rear Gear Info??
3.08 is a car gear
Off the top of my head, a 350 with a 3 speed manual would be 3.73, with a 4 speed or 3 speed auto would be a 3.07, and I think a powerglide woulda been a 3.73. This would be as base equipment and assuming no gearing options ordered. Last edited by Longhorn Man; 10-07-2009 at 06:19 AM. |
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10-07-2009, 06:17 AM
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#8 | |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
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Re: Rear Gear Info??
Quote:
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Tim |
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10-06-2009, 11:41 PM
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#9 |
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Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: Rear Gear Info??
My '71 1/2 ton lwb truck with a 350 and 4 speed had 3.73 gears listed as an option on the spid.
Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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