as the later model diff. has a different spline count easily fixed
Dana 60 swap
Elder User
Joined: May 2010
Posts: 957
Likes: 3
From: Valley Center, CA
Are you doing a complete swap-axel to axel? If so, it'll bolt right up. You are going to run into an issue
with the Differential yoke/drive shaft, as the later model diff. has a different spline count...easily fixed
with the use of a conversion U-Joint for the drive shaft to diff yoke. There will also be a few issues with
emergency brake cable lengths...the 1971 will need longer cables-one is longer than the other.
I did this swap a year ago to get better road gearing and better brakes.
with the Differential yoke/drive shaft, as the later model diff. has a different spline count...easily fixed
with the use of a conversion U-Joint for the drive shaft to diff yoke. There will also be a few issues with
emergency brake cable lengths...the 1971 will need longer cables-one is longer than the other.
I did this swap a year ago to get better road gearing and better brakes.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
It also depends on the size of the u-joint cups if 29 splines. 1966/72: There are four different 29 spline 'companion flanges.'
1966/70 F250 4WD 1330 cups / 1966/70 F250 2WD 1310 cups / 1971/72 F250 1310 cups / 1971/72 F250 1330 cups.
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Senior User
Joined: May 2011
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Sorry guys, I'm still confused. Are you telling me that my drive shafts' yoke, with the 2 u-bolts won't fit into the 71 diff. where the u-bolt nuts go thru? Also how bout using the 71 emer. brake cables? Thanks again
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
The yoke aka companion flange has either 10 or 29 splines to match the R&P's pinion gear.
The flange splines slip onto the splines of the pinion gear,
Why do you need to change the brake cables? 1967/72's have a 2" longer wheelbase, so the cables will not work on 1965/66's.
Something else to consider...what size are your brake shoes? 12" x 2 1/2" brakes introduced in 1966, but not all F250's have them.
Some 1966/72's have 12 1/8" x 2" shoes front/rear. Some have 12 x 2 1/2" shoes front/rear.
All Camper Specials have the 12" x 2 1/2" shoes, other F250's could have either, as it depends on the GVW.
The flange splines slip onto the splines of the pinion gear,
Why do you need to change the brake cables? 1967/72's have a 2" longer wheelbase, so the cables will not work on 1965/66's.
Something else to consider...what size are your brake shoes? 12" x 2 1/2" brakes introduced in 1966, but not all F250's have them.
Some 1966/72's have 12 1/8" x 2" shoes front/rear. Some have 12 x 2 1/2" shoes front/rear.
All Camper Specials have the 12" x 2 1/2" shoes, other F250's could have either, as it depends on the GVW.
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Senior User
Joined: May 2011
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Thanks guys, I think the seller has the Dana still under the truck. If not , What do i have to do, take my drive shaft out there? That would be no problem, also Crop duster said my cables wont work. What route do I take on the cables?
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Elder User
Joined: May 2010
Posts: 957
Likes: 3
From: Valley Center, CA
Dana 60 Swap-Companion
Well, sorry guys...I'm the one who caused some confusion here in the first place, and thanks to Bill (NumberDummy) for setting it straight.
Ok, so here are a few images and that may help me clean up my mess....
I mentioned replacing the E-brake cables as the ones on my donor Dana 60 (3.73)axel were rusted....these are longer than the original ones on my original Dana 60 4.56 axel.
The Diff. Yoke + "Companion flange" photos show the spline that I spoke of, the original was a 10 spline (pictured Below), the new one is a 29 spline, and there is also a photo of the u-joint conversion in the next posting.
Also, my truck doesn't have the original engine or trans. (now has a 302/C4), so I don't even know if my Dr. Shaft is original. What the heck did I get involved for!
Ok, so here are a few images and that may help me clean up my mess....
I mentioned replacing the E-brake cables as the ones on my donor Dana 60 (3.73)axel were rusted....these are longer than the original ones on my original Dana 60 4.56 axel.
The Diff. Yoke + "Companion flange" photos show the spline that I spoke of, the original was a 10 spline (pictured Below), the new one is a 29 spline, and there is also a photo of the u-joint conversion in the next posting.
Also, my truck doesn't have the original engine or trans. (now has a 302/C4), so I don't even know if my Dr. Shaft is original. What the heck did I get involved for!
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