56 boxes have the ribbed pattern on the side of the box and the bell housing looks a tad different. They came out behind all A12's, A14/15s had the larger 60 series to handle the extra torque.

Sometimes the thrust bearing can be put in the wrong way and the fork doesnt engage it properally, also as Fandatstick (cool name btw) said the springs need to be aligned rite in the lil holes/grooves as they slip off if not...

pesky lil buggers they are!

dave