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I commend you for upgrading to the larger joints and better brakes on your D44 instead of just sticking it in as is for a SAS. I know those early 44's had drum brakes and smaller u-joints than the D35.
(2) questions for you:
1) What is the width from coil bucket center to coil bucket center and from axle spring mount to axle spring mount. It looks like the mounts on the axle are slightly narrower than the mounts on the frame. \ /
2) When you mounted the radius arm brackets, did you have to drill all new holes or were you able to use one of the existing frame holes on each side to locate it? I think that I had heard the rear holes are already in the frame.