You went the right way going the used/freshened unit route.

With a stripped front output spline, the rebuild cost approaches $500 DIYing.

The $2000 or more cost of a rebuilt/warrantied unit is criminal. The worn out TCs can be rebuilt in under an hour, for under $200 in parts, if F output spline is un-stripped.

__________________
'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!