[quote quote=13800]The manual cross member is also rubber mounted but it is a different bushing setup than automatic.[/quote]
Could it be that only the three speed crossmember is hard mounted? The illustration I posted shows the hard mount as “synchromesh” and the isolated as “hydramatic”, but that’s an early parts book illustration and may only include the 3spd and RH5. The book does show three different P/Ns for crossmembers (3spd, 4spd, and AT). In any case, neither parts book lists P/Ns for the actual rubber trans mount.