I know that on the 1982+ cars, the function of the vacuum modulator is to smooth out the shift, and on the 1981 cars, the vacuum modulator is very important, as it can determine shift points, but on the earlier cars that have both a modulator and a rod, what jobs does the modulator have? The car in question, will not shift out of first gear. The transmission was rebuilt 2 years/20K miles ago, so I hope its not internal damage, but it may be.

__________________
Andrew Villasenor
805-720-5057
1984 300D turbo 5-speed manual(daily driver)
ALL MY DIESELS RUNNING WVO
Everything is for sale for the right amount
Ebay Store