Gear Compatibility
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Gear Compatibility
I've got a 1964 F250 with 4.56 rear end gears. I've found a set of 3.31 gears out of a somewhat newer Dodge 250 pickup which I've been considering swaping in. I've been told I need a different flange to make them fit my Ford housing. Are there any other compatibility issues which I need to be aware of?
Postmaster
Joined: Apr 2002
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From: Coal country
Try asking this in the forum that handles differentials; you might get the information you need:
https://www.ford-trucks.com/forums/forum69/
Good luck!
https://www.ford-trucks.com/forums/forum69/
Good luck!
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by peterbilt379exhd
I've got a 1964 F250 with 4.56 rear end gears. I've found a set of 3.31 gears out of a somewhat newer Dodge 250 pickup which I've been considering swaping in. I've been told I need a different flange to make them fit my Ford housing. Are there any other compatibility issues which I need to be aware of?
3.54 thru 4.10
4.56 thru 4.80
However, you may have to modify your driveshaft by using the companion flange from the Dodge. The present flange you have is for 1330 size U-joints. What Dodge uses is?
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I know they are both Dana 60 rear ends and that I can swap the companion flange. I've heard about some issue with the case being different between 4.10 gears and lower ratios and those above 4.10?
