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08-08-2020, 09:08 AM
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#1 |
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BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,034
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Another gearing question
I have a buddy that is giving me (if I want) the front and rear off of a 72 3/4 ton truck. He said its geared at 4:10. With a 700R4 and 33 inch tall tires, how would this be bombing down the freeway?
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08-08-2020, 09:09 AM
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#2 |
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Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,376
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Re: Another gearing question
Perfect
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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08-14-2020, 06:06 PM
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#3 |
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Registered User
Join Date: Jul 2013
Location: Deltona, FL
Posts: 235
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Re: Another gearing question
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'66 c10 rust bucket, 350 (pulled and sold, now waiting on 4bt install) nv4500 stock bellhousing, '85 c30 front suspension and 3/4 rear coils with 4.10 H072 rear axle NV4500 install http://67-72chevytrucks.com/vboard/s....php?p=6488778 Suspension update http://67-72chevytrucks.com/vboard/s....php?p=8236775 |
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08-20-2020, 11:54 PM
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#4 |
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Senior Member
 
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,975
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Re: Another gearing question
like this:
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08-21-2020, 02:37 AM
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#5 |
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Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,896
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Re: Another gearing question
Will be about about the same as a stock truck with 3.73 and stock 29" tires up to 3rd gear. Not accounting for extra rolling resistance and tire weight. Then will drop about 800 rpm going to 4th (overdrive). Should be fine. Nice thing about the 6l80-90 is there is an extra gear in-between 3rd and 6th. With 6th gear being fairly close to final overdrive of 700R4.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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08-24-2020, 12:20 AM
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#6 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,727
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Re: Another gearing question
My K20 has 4.10s and close to 33" tires. It has spent very little time on the freeway, and that was years ago. IIRC, 70 mph was about 3000 rpm, so a 700R4's 70% reduction should yield about 2100 rpm. Which is in line with Jocko's chart above. Sounds about right for freeway use.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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