Lincoln clusters?

[rotorwrench]

The 259-series transmissions were a carry over from the Ford/Borg Warner designs prior to the end of the flathead era. The diamond tooth designs came in for Ford products in 1951. Other manufacturers may have also used the 259-series since several manufacturers used the R10 overdrives. Ford used the 259 in certain light duty applications up into the early 60s. The bearings for the counter shaft changed from the caged design rollers to loose rollers in there somewhere. This is evident in the change of the bore ID of the cluster gears as Mac VP mentioned previously.