Maybe it's there and I'm just missing it, but I've been searching the books looking for the specs on the ball cap and the driving plate shaft, and not finding them. Anybody have the numbers? Is there a source listing all the correct transmission measurements?
I don't know if the spec exists in any of the manuals. I think.002" is where you want to be with a new ball cap in terms of OD / ID difference.
Yes, I believe that's right. But it would be nice to have specific measurements. Example: Should the shaft be 1.565? 1.560? In the axle book there are specific numbers for just about everything, but not in the transmission book.
According to Ford Repair / Training School manual chart, the allowable clearance is 1/32" or .0031.
But best to get around .002" or a bit less.
I mike the tail shaft and get average, then order from Lang's the re-babbitted ball cap that will fit best to the measure of the tail shaft.
1/32" = .031"
That's quite a bit.
Craig is right, that is way to much, and .002 is to small, they will gall most times. The reason is the tail shaft is at a 90 degree, but in most cases, the ball cap does not bolt at a 90 degree because the hogs head and the pan are not even and will distort the bearing on the shaft when bolted tight.
Fords tail shaft O.D. is 1.560, and the ball cap hole is 1.562-50, making a .002-50 thousandths clearance, at 1 and 9/16.