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03-01-2011, 02:50 PM
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#26 |
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Registered User
Join Date: Feb 2011
Location: Dawsonville, GA
Posts: 14
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Re: Decoding truck 1971
One last thing. Is there a simple way to decode what gear this truck has in the rear end? I need to find out so I know what cam to put in the motor. I see numbers NF3896838 and THA WO96 2 Thanks
Just looked inside to find a gear number. It is a 12 bolt cover and has a GM 8661 ring gear. I hope this helps Last edited by oakridge; 03-01-2011 at 03:19 PM. |
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03-01-2011, 10:17 PM
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#27 |
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Registered User
Join Date: Feb 2011
Location: Dawsonville, GA
Posts: 14
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Re: Decoding truck 1971
I think it might be a 3.08 from what I am reading. the center number on the gear is a 14 43 would this be right?
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03-01-2011, 10:27 PM
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#28 |
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Registered User
Join Date: May 2004
Location: Topeka, Ks
Posts: 2,293
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Re: Decoding truck 1971
Correct, you divide the 43 by 14 and get 3.071428571428571 or 3.08
 Jeff
__________________
I'm not a pessimist, I'm just optimistic that bad things are going to happen. 1971 Cheyenne Super K10 - tilt, cruise, air, am/fm, tow hooks, factory buckets! 1986 Jeep J10 pickup, - 5.3L Vortec with 4L60e and NP241. |
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03-02-2011, 08:19 AM
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#29 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Decoding truck 1971
My shortbed came with a 3.071428571428571 rear,too. But,I'm changing to a shorter ratio
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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03-02-2011, 09:15 AM
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#30 |
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Registered User
Join Date: Feb 2011
Location: Dawsonville, GA
Posts: 14
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Re: Decoding truck 1971
The cam I'm going to use they say a 3.50 gear with a 2200 stall would work best. My question is how that will work going down the road as far as mpg and performance. 3.50 vs 3.08 Has anybody done this?
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03-02-2011, 09:50 AM
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#31 |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Decoding truck 1971
This thread is evolving into another topic.Maybe,if no luck comes here,you should start a new thread with this specific topic. In the Engine & Drivetrain forum. I figure you could make up the difference in gearing with different stall speed. But,why this cam? Basically,you buy a cam to fit what you have or make what you have fit the cam. So,if you are stuck on this cam maybe you want to change gears? I'm changing my 3.08s to 3.42 because I'm going with a 4-on-the-floor and 3.08s will be doggy. I want to have decent hiway gears for now and hopefully add a Gear Vendors o/d. And 3.42s will work better with o/d.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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