I did this swap on a 37 and had to use my original axle housing, torque tube, and inner drive shaft. The only hanp us on a 37 is that the spline on the front of the pinion on the 54 is not the same as the spline on the 37. I had to cut the splined bushing out of the out of the inner drive shaft from the 54 and have a drive shaft shop weld it into the 37 inner shaft. Not too bad a job but it has to be welded in straight and square. As someone else said it is the best thing you can do for cruising if you want to keep everything looking original.
I don't know which spline the 41 has.
Gael
