Originally Posted by mplafleur

My '85 300SD has started to shift only at high rpms. All forward gears and reverse work well, no slipping or flaring. This is not a B2 problem.

I disconnected the kick-down switch a year ago so it's not that.

I replaced the modulator last Sunday, so It's not that. (it did have a vacuum leak though)

I did notice that if I take it up to ~2500-3000 and back off the throttle quickly, it will upshift without maxing out the rpms.

It acts like the kickdown switch is still hooked up. Where does that input go?

I have not attached a vacuum gauge to the vacuum line at the amplifier output where it goes to the tranny yet.

Any guesses?