anyone have to wait till thier trans warms up bef driving? - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-30-2005, 09:01 PM   #21
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Quote:
Originally Posted by opensourceguy
All they will do is hook your car up to this machine, that will pump air through your tranny [i think] pushing the fluid out, while replacing it with new fluid. Or just drop the pan, drain refil [not a tranny flush].


-justin
Nope. The machine has a piston in it. The piston is all the way down when you start. Your old fluid is pushed by your own transmission pump into the lower chamber, driving the piston up, which has new fluid on the top side. As the piston rises, new fluid is forced into your trans. No air involved at all.

Air would be really bad news for this type of service.
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Old 01-31-2005, 03:25 AM   #22
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i was wondering what does the vacuum modulator do for the trans? does it deal with transmission shifting? doesn't it provide the trans to shift properly?
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Old 01-31-2005, 03:33 AM   #23
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Quote:
Originally Posted by zo6vette
i was wondering what does the vacuum modulator do for the trans? does it deal with transmission shifting? doesn't it provide the trans to shift properly?
Modualtes line pressure for your shifts into drive gears or reverse....If the lines going to the modulator are shot...then you're tranny slams into gear like your at the limiter and drop it into gear.
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