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09-29-2012, 05:49 AM
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#1 |
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Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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diff ratio
Iv got an 81 C-30 350 4 speed man with the big 14 bolt dually out back, Im just wondering what ratio this baby is and whats available to make it more highway friendly?
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09-29-2012, 08:15 AM
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#2 |
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Registered User
 
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: diff ratio
My ratio was 4.10 , I have friends who tow race car trailers and have switched to 3.73 , easier on the engine (RPM) didn't noticed any power loss towing.
Desert |
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09-29-2012, 03:05 PM
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#3 |
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Chevy Enthusiast
Join Date: Jul 2009
Location: Canyon Lake Texas
Posts: 2,024
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Re: diff ratio
Is it a cab & chassis truck? If not then its probably a Dana 70 HD. A NV4500 swap would make it cruise a lot nicer.
__________________
Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress) |
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09-29-2012, 03:10 PM
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#4 |
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Registered User
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Re: diff ratio
Most duallys are 4.10. If it is then, like stated above, a 3.73 will be the best answer.
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09-29-2012, 04:43 PM
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#5 |
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Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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Re: diff ratio
I was actually thinkin 3.7s, a buddy has those in his F truck with a 31" tall tyre, seems to tow good
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