Alex;
BB-1239-A = 453X
BB-1240-A = 462
BB-4222 = 3920
BB-4221-B = 3984
The first numbers are Ford, the second are Timken numbers.
Without the A suffix the cross over ends up the same.
By that I mean the BB-1239 is also a 453X
and a BB-1240 is also a 462.
BB-4221 is also the same without the a suffix (Timken 3984)
My memory tells me the difference is the inside radius ( my memory is known to be in error. Ask Christine)
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