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What diff ratio with a 5 speed?

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Old May 27, 2007 | 03:20 PM
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Chuck350
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What diff ratio with a 5 speed?

I'm swapping out a C6 with a NV4500 in my '77 F350 w/460. The diff is a 3.73. The 5th gear in the NV4500 is .73.

I'm going to be hauling a 10 1/2' slide-in camper. Should I change the diff to a taller #?

Any recommendations?
 
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Old May 27, 2007 | 07:15 PM
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That really depends on your tire size, with 31" or so tires the 3.73 gears should be fine. However with 35"+ you should consider 4.11 + gears.
 
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Old May 27, 2007 | 07:40 PM
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Thanks for the reply. I'm running LT265/75QR-16 Kumho Road Venture AT KL-78 E tires. They're 30.5" in dia. The NV4500 is going in, in 2 weeks, as is a new Speed Demon carb. New 3155lb rear springs, a 32 gal main tank and KYB shocks all around are now in place. I'm anxious to see how the new setup is going to perform.
 
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Old May 27, 2007 | 07:43 PM
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My OD is slightly higher and my truck came with 3.73 gear and closely sized tires. With the five speeds, it will probably work out really well.
 
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