Difficult shifts at high RPM, all gears (turned out to be broken clutch disc)

Hey all,

Just looking for a 2nd/3rd/4th/etc. opinion.

Halfway through my second session at the track this past Monday I started having issues getting any gears when shifting at higher RPMs (>3500).

No grinding or any adverse noise coming from the transmission just refuses to grab another gear (up shift and down shift).

Transmission is a pumaspeed rebuild unit with a quaife LSD, RTS twin friction clutch/flywheel and new slave cylinder about 11K miles ago (for all transmission and clutch parts).

At the track I tried adjusting linkages, re-bleeding the clutch, changing the trans fluid (fluid that cam out looked pretty good, only about 1200 miles on it).

My assumption is slave cylinder or clutch/pressure plate issue, I swapped the clutch master and bled it again yesterday, no dice.

Anyone have any other things to check before I yank the transmission out?

Thanks.

Check your motor mounts, especially if you have an aftermarket poly RMM that’s been in there a little while. The front bushing tends not to last very long before it rounds out and lets the engine start rocking. Best way is to either push on the motor, or start it up, turn the A/C on and look under the car - the engine should look pretty solid at the RMM and not vibrating around.