Making The Weak 7-1/4 Rear Axle Live... Kinda

Ant said

Is it a direct swap or is modification needled?

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I do not know. Axle width and perch width could be different. There are thousands in breakers, many with disc brakes. You would have to check with a tape measure. Check flange to flange using a couple of pieces of angle iron a foot long and c-clamp or vicegrip on the flange.
The centering pin on the spring would need to be checked for proper fit and the width. The advantage is the number available with 3.55 and 3.91 gears, sure grip and newer with discs, makes them fairly inexpensive.
Dakota's had a couple of widths depending on the year.