Originally Posted by Keith
Stays at the same RPM but speed increases.
Then when it warms up, its all good.
...should be the opposite, RPM's increase but speed stays the same if it was slipping. It should also be in the higher gears and not the lower ones.
It could be a problem with the TOB not properly engaging when cold, could be some sort of residue still left on the flywheel or clutch from the car that could be causing this. Could be a problem with the slave cylinder not applying enough pressure when it's cold. Sorry i can't be of more help, but it doesn't seem like your clutch itself is worn out.
It's not making like a chattering is it?
IMO check all your hydraulics first, rebleed everything. It's cheap and easy.