634, 644, 868 TR Indicates Triple Disc Lock-up clutch, all other single disc.
Comments:
3/8" pilot length, hub is stepped on the inside (1 3./8 step from top), brass bushing in pilot. (A618 '94-'95 hydramatic can make NonLock); InterChanges: LS & HS Do NOT Interchange due to 1/4" difference in pilot length. see Precision 2017 Catalog pg 72-73 for more options