Rear Differential Replacement

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Dec 11, 2023 | 01:40 PM

Billy J Mitchell

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1st Gear

Joined: Dec 2023

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Rear Differential Replacement

Hi... does anyone happen to know what the diameter of the pinion shaft and the diameter of the ring gear of a stock 1948 F1. I'm looking to replace the original ring and pinion to a higher ratio. Any suggestion on where I can find one?

Thank you,
Billy

Dec 11, 2023 | 04:34 PM

bmoran4

Parts Nerd Extraordinaire

Joined: Sep 2010

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From: Western NY

Here is documentation on the Ford stock offerings with Ford part numbers you can use with specialty vendors:

Dec 11, 2023 | 05:52 PM

3twinridges

Cargo Master

Joined: Nov 2014

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Hi Billy

Randy’s ring and pinion makes a good replacement, I used their kits to move our F1 to a 3.54 and am very happy with it.

JB

Dec 13, 2023 | 06:04 PM

38 coupe

Cargo Master

Joined: Aug 2010

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From: Houston

The 48 through early 50 F-1s use a Dana 41 rear axle. Re-gearing an early F-1 has gotten so popular that a reproduction 3.54 gear set has been made. Part number 8C-4209, available from several vendors (example one here). Disclaimer, I don't remember if there is a carrier break in the Dana 41 that you need to be aware of before changing gears.