Originally Posted by Constantine

Hi Thomas,

Appreciate the good remarks about our products but do agree with Dan that it sounds as if the transmission vacuum modulator is either adjusted incorrectly or more probably, the vacuum line from the engine to the modulator valve has become disconnected.

This happened to me once with my track car. The upshifts felt very harsh and I found the rubber vacuum line from the engine had come off the hard line along the TT right at the front by the flywheel housing.

It does deserve further investigation.

Kind regards,