Rick, aren't you using a all syncro toploder three speed from falcon? Falcon gearboxs have a larger diameter input shaft. The falcon shaft is 1/8 or 1/4 larger and allows for considerable slop on the shaft.
Trev, The Previous owner of my ute had installed a falcon clutch (friction plate). By the time I replaced it, it was shuddering to the point it was difficult to drive it had started to wear the input shaft spline and I blame it for destroying the gearbox. The gearbox had an excessivly worn bearing where the input and output shaft meet. This mean that it fell out of each gear whilst driving it. As the mismatched spline did little to support the shaft allowing excessive flex.
Regardless I was warned over and over when I was looking for a friction plate. At the time it cost only $10 or $20 for a specially manufactured daikin clutch over the price of the "off the shelf" falcon one. the right one through macs or carpenters will cost you only $80.
The pressure plate I had remanufactured and cost me less than a replacement diapham plate.
Cheers
Warren
Grizzly (Aussie Mainline)