9 inch ford

You may need to have a new drive shaft made, or shorten an used one. Besides the different u-joint sizes the dimension of the centerline of the u-joint to the centerline of the axle is different from a 7 1/4" compared to a 9" ford. You need to measure to see exactly what length you need. I have the same problem with a 9" out of a Lincoln Versailes in my '67 Barracuda. If you do a search you can find the dimensions for most Mopar rear axles to compare to your 9" at least for a comparison. But you still really need to measure to do it right.