So I finally got time to build two new bulkheads for my merv - New HR bulkheads and two new HR differentials. After building up the diffs with the required Traxxas bevel gears, CVD outdrives and new Avid bearings, I was pretty shocked to see there was a TON of lateral slop - something in the neighborhood of .050 !! (at least) No way. Unacceptable. Trying to shim that would shove the bearing right off it's journal.
Obviously, not gonna run that so I shot emails to both HR and Liquid RC - we'll see what happens now, I hope I will be able to report on their outstanding customer service...
Comparing the width of the diff carrier to the Traxxas unit I hoped to replace revealed it to be .023" narrower measured "inside" the bearing journal and .028" narrower measured "outside" the bearing journal. (overall width) So, add that to the four shims it took to get the Traxxas diff carrier properly shimmed and my original estimate was not far off.
I had read of others having to use large numbers of shims with these new Diffs but this is a joke. I just hope I can somehow get this straightened out because looking at a 70 dollar piece of useless junk on my workbench really makes me mad. I am NOT a happy camper.