I was wondering if there is a specification for the transmission output shaft play where it connects to the first U joint. I replaced the output shaft bushing in the tail of the transmission. Before I put the bushing in, I slid it on the output shaft to see how tight it was. I thought it was fairly tight and measured each part separately to determine there was only a few thousandths of play. Once I put it back together I put a dial indicator on the flange right by the U joint which is maybe 3" from the bearing area. I measured about .030" of play if I grab the shaft and move up/down and side to side. I am sort of thinking that the output shaft spline area may be worn a bit. Thinking perhaps a tailpiece replacement would be good. Does anyone have a specification for this measurement or experience with it? The output shaft diameter is consistent and measures the same over the length where it would touch the bushing.

2006 F-150 4.2L long bed
2 wheel drive
88,000 miles

 

Excessive play will cause the shaft to wobble, creating excessive wear and vibration. 0.030 seems excessive. There is a bushing in the tail shaft which could be worn.

 

Will that amount of ply affect the longevity of the output shaft seal?