Thanks, Dave. That clears up any and all mis-conceptions I have had about this whole swap deal (and, I had a few...)
I called Moser today and found out what I needed to know from them.
My tab would end up somewhere around $550.00+ for Moser axles, wider brake drums, and the backing plates and miscellaneous hardware I'd need to swap to a LBP setup.
I believe that for now, I'm going to replace the 7/16" OEM wheel studs with some half-inch, grade 8 studs in these 4" bolt-circle axles, and enlarge the existing holes in my SBP drums to accommodate the half-inch studs.
I only run 8" Drag Radials at the strip, and don't even have a high-stall converter or a low-gearset in this 904.
I don't think I'm going to hurt these axles, at least, until I get a 3,500rpm-stall converter.
I can use that $550.00 to replace the riding lawnmower that got stolen out
of my backyard on Christmas eve.
Thanks a bunch for the clear-as-a-bell explanation of the vagaries of the different brake setups for the various rear-end configurations. You should be writing tech manuals, Dave!
Bill, in Conway, Arkansas