Input Shaft Assembly

The following picture is of the input shaft from my '91 WC T5 transmission and the associated parts.  The bearings and blocking ring on the left are the original parts.  The parts on the right are from the Ford Racing (M-7000-A) rebuild kit.

The bearings and blocker ring supplied in the kit are identical to those originally used with one exception (more on this in a minute).  Only the front bearing has a part number on it.  The original and replacement bearings are Timken LM48548's. 

The blocker rings are the one part which seem slightly different.  The new one is in the picture below on the left with the original on the right.  The inside surface of each is rough.  If you view the full size version of the picture, you will see that original has a small groove through the center of the rough surface all the way around.  The new piece does not. 

This ring slides onto the back of the input shaft.  The rough portion fits perfectly against the polished looking cone at the back.  Since this cone fits the contour of the ring perfectly, I don't think the center portion of the old part was wore down.  This appears to be a slight change in design.