I replaced my modulator today with a new TCI white stripe (screw in) unit. When test driving it still shifts very quicky (within a few seconds) through the gears into drive. Before arriving back home I noticed smoke pouring out the exhaust. Upon closer inspection I found the problem was transmission oil being pulled through the modulator vacuum line into the intake manifold. The old modulator I replaced did not do this however did shift quickly just like the new one. I did adjust the screw in 1-2 turns and no difference in the shift time. My questions are: #1 Is this modulator toast already after a few miles? #2 Should I be utilizing the down shift down rod that attaches from the carburetor to the transmission. Does this rod have anything to do with the shifting delay? #3 I read somewhere about changing out the madulator pin with a 16d nail cut to max length of 1.75" Will this make much difference? If anyone can help me out with this I would be so greatful! Thanks A Bunch ! 1MadMav
the modulator is toast if trans fluid is coming thru it. you do not need the kickdown rod to get proper shift timing except under wide open throttle it will still shift earlier than needed. as far as the pin, you should measure the one in there now and adjust accordingly. longer pin = later harder shift shorter pin= softer early shift. use adjustment screw on new modulator first then adjust pin length. good luck
When screwing in the modulator be sure to screw it in using the proper wrench. If you use pliers on the can it can tear the diaphragm easily. TCI may have "adjusted" the modulator to an extreme and ruined the modulator too - so take your pick. You can get away by screwing the modulator in by hand IF you use locktite 518 on the threads and gasket.the maximum pin length for your modulator is 1 3/4" no more. Get your new modulator from the local parts house - look into the hole to see if there is any oil in it - you never know when a returned unit is put back on the shelf.
