the problem has happened twice and feel lucky the trans still works.......when we bought the car a few months ago I chnged the fliuld as it was a lil dark....about 2 weeks later my sons takes a short trip about 25 miles and the trans was blowing out fluid where I couldn't see as I had to go get him as it quit pulling due to being 3.5 qts low I put it in and he drove home...hell drove it for about a month..then last week it did it again...so I changed filter and fliud ..fliud not burnt and nothing in pan or filter...he drove it today..only thing I found wrong this time was the TV CABLE had come off the lingage?..could this had been the problems in building pressure.. or could the MODULATOR VALVE be bad or something in the valve body?
any help would be great
There is no TV cable, the cable controls downshifts (kickdown cable) so it being disconnected probably has nothing to do with the fluid loss. The vacuum diaphragm controls the throttle valve. Damage to the vacuum unit cause improper shift timing, mushy shifts, harsh shifts, or delayed shifts. 3.5 quarts of fluid is a lot to lose so there must be some indication as to where it came out of the transmission. Overfilling can cause foaming of the fluid and loss out the case vent or the dipstick tube. A clogged case vent (top rear of transmission case) can cause leakage past seals. Check the vacuum diaphragm for leaks by seeing if it holds a vacuum. If the transmission and areas around it are so covered with fluid that you can't see where it came from clean it all off and check regularly for signs of leakage.
I believe it may have come out the front seal..but it;s not leaking a drop now..where is the vacuum diaphragm?....you mean the modular?
Not a specialist by no means, but the shift modulator, I believe, has a vac line connected to it. Not sure exactly how it is plumbed, but it may be possible that boost pressure is getting to the vac diaphram in the modulator, and has blown through it? This would put pressure into the tans and cause some blowout. I would have to believe however, if this were the case, as Don mentioned, shifting would be erratic, and when the engine actually pulls vaccuum, fluid would be pulled into the intake and there would be an amazing smoke show!
Martin
Vacuum unit (modulator) is on the right side of the case.