Opened Up The Old 489

SGBARRACUDA said

.....M803149/M8031101 is the bearing for a 742 case? Interesting, this was somebodies home brew.

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Yep, this had the M804010 race (489 casting )and M803149 bearing. I sent a couple of pictures to Cass for his take on it and an order for a 3.73 tapered 10 spline to replace.