That would be my guess. Although it may not really matter. I recall that the rebuild kit I used on mine didn't have grooves like that. I may have to dig it out of the parts box and check again.
Is that the original cross or the replacement? The replacements are listed as fitting 40-54 1/2 tons.

Last edited by klhansen; 04/11/2021 6:01 AM.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.