Early Ford gear question

[Fredb_]

I have about 10 of these gears marked 67-7100. They all appear to be identical except for the OD of the fork groove. Some measure 1.93" and some measure 1.68". Can someone tell me what years each of these will fit and function in?

Thanks

[DavidG]

Early '36 (only) first and reverse sliding gear used with the output shaft with straight spines and only with the corresponding 67-prefix cluster gear. There's likely very limited demand for it or the matching cluster gear as spiral spline gears made the straight-spline sliding gear obsolete and the cluster gear is best used in vehicles where stump pulling is an important requisite.

[Brian]

The 1.68" yoked gear is #B-7100 as used in 32-35 trans
The 1.93" yoked gear is #67-7100 as used in conjunction with 67-7113 cluster 36-39 trucks 1/2 ton, trucks 1/2 ton 60 HP 37-40, 38 trucks 1 ton, and 39-40 trucks 3/4 and 1 ton.

[Fredb_]

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Thanks Brian. My Green Bible doesn't seem to have those defined measurement differences and Mac Vanpelts site didn't have it either that I could find. The B-7100 gear is certainly sought after more than the 67-7100.