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1961 - 1966 F-100 & Larger F-Series Trucks
Dana diff ratios

1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Dana diff ratios

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Old

Jan 16, 2019 | 08:00 PM

#16

1972RedNeck

Logistics Pro

Joined: Feb 2011

Posts: 3,522

Likes: 11

From: Townsend, MT

Quote:

Originally Posted by Boss9F100

the sweet spot on a stock 352 is off idle Up to 2800 not OVER 2800.

My bone stock Ranger with 3.25 gears and factory Overdrive does fantastic right off idle. As soon as Truck is rolling it’s in 2nd gear then usually in high at 2000 rpm. Into high OD by 40 mph.

I assume you run about 29" tires?

3.25 with the .85 overdrive comes out to be 2.76:1 overall. Running 70, you should be turning about 2200 RPM correct?

I think I have read where Bill (Number Dummy) had a very similar setup in his '65 and made well over 20 MPG when driving really nice.

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Old

Jan 17, 2019 | 01:20 AM

#17

Jimmy nz

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Cross-Country

Joined: Apr 2017

Posts: 55

Likes: 1

Think I'll look for a 3.54 diff gas costs over $2 per litre here so any gain in mpg is Good

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