Kelly I will add this by comparison ... I have the same exact issue ..car shifts fine and when it heats up shifts very hard ...cant down shift and have to press it into gears ... the difference is mine is single disc, and I replaced the master and slave ... the problem always seems to come back ... i think George might be on to something with the gear lube ...because I did change it because and the problem subsides for a short period of time then returns.
Ron
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