Stock Rear Diff Expectations
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Junior User
Joined: Jul 2013
Posts: 58
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From: Alabama
Stock Rear Diff Expectations
How tough is the original differential in my '55 F100? Would there be reasonable life expectations behind a pretty much stock 300-350 CI V8 and auto trans?
Cargo Master
Joined: Mar 2001
Posts: 2,759
Likes: 70
From: Elk River, MN
The original Dana 44 is probably tough enough, but the selection of gear ratios is limited to what came stock. Maybe 3.92:1, which is fairly steep unless your auto trans has an overdrive gear.
Hotshot
Joined: Feb 2015
Posts: 17,559
Likes: 1,081
From: Central Delaware
Summit and others have ring and pinion sets for the Dana 44. A couple would suit your auto very well.
https://www.summitracing.com/search/...-model/dana-44
https://www.summitracing.com/search/...-model/dana-44
Post Fiend
Joined: Jun 2001
Posts: 7,493
Likes: 7
From: Erie, pa
https://www.ringpinion.com/
Look at the site and then call Randy and talk to him
Senior User
Joined: Jun 2002
Posts: 291
Likes: 0
From: Ft Lauderdale USA
Agreed the gears can be swapped. I also had mine converted to a posi. I have a Ford Racing 306 crate motor in mine for 4 years now and stomp on it now and then. I have done a few burnouts, no issues.
I just added the Weiand 177 blower, so far so good. I do have a built AOD.
I just added the Weiand 177 blower, so far so good. I do have a built AOD.
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Tuned
Joined: Aug 2008
Posts: 310
Likes: 13
rear end 44
I'd really like to change the ring and pinion on the dana 44 in my 56 with a fordomatic. It's 3.92 now and a 3.31 sure would be nice. I'm assuming the carrier would need to be changed out too?
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Fleet Owner
Joined: Jul 2004
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From: NM
The reason most people go with the 9" has been that 9" axles in decent shape with 3.50 gears were fairly available. I think they're getting harder to find, especially in good shape. The cost of re-gearing a D44 isn't cheap, I'd guess you would be in it for $500 minimum, depending if you can set up the gears yourself. Any ratio less than 3.73 you need a new carrier, too. But if you can't find a 9" that is in good shape already, and have to rebuild that, the cost isn't too much different.
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