1977 f150 Differential upgrade help
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Joined: Feb 2016
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1977 f150 Differential upgrade help
looking to upgrade my front and rear differentials, I plan on doing the rear first, then front. I was told any 90's f250 differentials would work. Does anyone have any suggestions on this?
My truck is a 1977 f150 custom
351M
4 speed manual
np305 tc
d44 front
d60 rear
My truck is a 1977 f150 custom
351M
4 speed manual
np305 tc
d44 front
d60 rear
Tuned
Joined: Jan 2017
Posts: 338
Likes: 8
From: North Idaho
BBD, D60 and 44 are strong out of the box. What kind of "upgrade" do you want to do? Depending on your answer, there are a TON of aftermarket modifications (e.g. chrome molly axles with higher spline counts, carriers, housings, etc.) for your front and rear. Curious what a 90's F250 has that we don't.
It may be much less a headache to put better parts into what you have than try to fit another truck's parts into your '77. I built a Dana 30 front end for my old Jeep that made the Rubicon, Moab and a slew of Colorado hard core trails.
It may be much less a headache to put better parts into what you have than try to fit another truck's parts into your '77. I built a Dana 30 front end for my old Jeep that made the Rubicon, Moab and a slew of Colorado hard core trails.
Cargo Master
Joined: Jul 2010
Posts: 2,099
Likes: 8
From: York, Pa
I did use a Ford 10.25 in place of a D60 rear. Mine was free but they are cheap to get and slightly better design in most areas. Only thing that sucked was the e brake cables are much larger so stock do not fit. I just used the factory 10.25 length and brought them out to the outside of the frame like the 1990 it came from. I just took my center pull cable and moved it along with a couple homemade angle brackets to hold the cables. You'll have to get your driveshaft shortened.
Elder User
Joined: Oct 2016
Posts: 712
Likes: 1
From: Mesa, AZ
Agree that if you're gonna cummins swap it you want more axle under there. You'll be pushing the envelope on what a D44 can handle for weight, and the D60 isn't enough rear for monster torque.
A D60/Sterling combo would be much better. Be aware of early 2000s F250s, as many of those have a D50 front which isn't much of an improvement over a D44
A D60/Sterling combo would be much better. Be aware of early 2000s F250s, as many of those have a D50 front which isn't much of an improvement over a D44
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FordBoypete
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