Gearbox Clunk

[Adrian Jones <AdrianJones@compuserve.com>]

Hi All,
Anybody got any thoughts on a clunk from the gearbox as the clutch pedal
 is released.  It really feels/sounds bad. This only happens upshifting
(all gears) and not downshifting.
The u-joints feel OK and there's not that much slop in the differential.
Is a gearbox rebuild in my future.
Has it got something to do with engine thrust washers.
Thanks.  Any comments are appreciated.
This is a 1500 Midget, BTW.
Regards,  Adrian  =