not as much as you would think.,, I have broken 4 diffs. and one axle. their cost with labor to change everything everytime , is about equal , with the v8 only I have have only one diff and one axle that i have failed.

to do the ford 9" of course the first one cost the most, I tested the 327 set up, and now a few people have it ,, I tested the 346 and it worked some may want just that. And now it is time for a ford 9" , thanks Les ,someone has to do it. the 346 at this time is a open rear ,we have not found a posi for it. that is why i want to go with ford 9"

updated test on post #2 jim