Tranny question

[EMSjunkie]

Howdy folks! been away for a bit, but I think things are finally gonna settle down in my life............anyway.......
I have an 80 GMC pickup, half ton, SBC and turbo tranny.
had it out on the hiway yesterday, and noticed when I decelerated, or came off idle, a pretty good amout of white smoke was coming out the right exhaust
I thought maybe it was sucking oil from the valve cover PCV valve. but it appears to be trans. fluid :?  the tranny started slipping, and after adding 2 quarts of fliud, it acted fine, until the return trip home, more smoke, tranny slipping again.
is it possible for the vacuum modulator to go bad, alowing trans fluid to be drawn up the vacuum line to the intake :?:

[UGLY OLDS]

Very possible ... Welcome back ...



Bob...

[chimp koose]

I have had that happen too. Diaphram  in the modulator split and it sucked up trans fluid. And I too am glad to see you back. Team smart is back at full strength!

[sirstude]

welcome back,  had some customer's cars years ago do that same thing with the bad modulator.  Sure was a bear the first time, thought it had lost an intake gasket, ripped off the intake, and when I was putting things back together I noticed the tranny fluid in the modulator hose.

Doug

[EMSjunkie]

Thanks guys :!:  I knew the collective brain trust here would know

you guys still rock :!:
love each and every one of ya!

Vance

[phat rat]

Hey Vince it's been a long time. Good you remembered us. Thought of you when I came through Amarillo last year but then remembered that you'd moved

[enjenjo]

I had a whole different thought when I saw EMSjunky, and a tranny question

To do a quick check, disconnect the vacuum line at the carb, plug it, and take for a drive. You will have to fool with it to get it to shift, but if the smoke goes away it's the modulator

[EMSjunkie]

I had a whole different thought when I saw EMSjunky, and a tranny question

easy big boy :!:    

that is a great idea, i will give it a try tomorrow

that has to be the only place the fluid could come from, plus the old truck sat for over 7 years without being driven, and now it gets driven 3 or 4 times a week. thanks for all the advice, I really do appreciate it :!:

[348tripower]

I had a whole different thought when I saw EMSjunky, and a tranny question

To do a quick check, disconnect the vacuum line at the carb, plug it, and take for a drive. You will have to fool with it to get it to shift, but if the smoke goes away it's the modulator

:ha)

[Arnold]

I had a whole different thought when I saw EMSjunky, and a tranny question

ROFL.

To do a quick check, disconnect the vacuum line at the carb, plug it, and take for a drive. You will have to fool with it to get it to shift, but if the smoke goes away it's the modulator

May as well change the fluid while you are at it. Just do what you did a few more times..before you came back "Rustproofing" the exhaust Welcome back

[EMSjunkie]

Tried Franks tip today, got as far as removing the vacuum line, noticed tranny fluid dripping from it :x

replaced to vacuum modulator, and no more smoke :!:

thanks for the advice and "kind words"

Vance

[57larry]

glad it's fixed

[EMSjunkie]

Hey Vince it's been a long time. Good you remembered us. Thought of you when I came through Amarillo last year but then remembered that you'd moved

Hey Jack!!  how you been??

yep, moved from Amarillo over a year ago, kinda miss the big city conveniences, but don"t mis the ex and the headaches!!

[phat rat]

Doing great. Yes being a long ways away from an ex is nice. Mine moved about 200 mi away