tranny flush technique? - 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 11-23-2005, 02:33 AM   #1
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Default tranny flush technique?

has anyone ever tried flushing the transmission by just dropping the pan, removing the oil filter, and putting a hose from the oil filter inlet to a bucket of new ATF, to suck in new fluid and let the old fluid drain out? seems like it would work just as good as paying $100 for a flush. im tempted to try this.. let me know your thoughts.
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Old 11-23-2005, 02:38 AM   #2
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is there a reason that you think that you need to change the trans....does the fluid look burnt or smell....is the trans slipping.....the trans is a delacate thing...you wont get all of the fluid out with dropping the pan, and that might not be a bad thing....... but on the other hand depending on the miles on the car which is see is un the upper 200K a flush might be a bad thing....cause a flush will take everything that was holding the trans together
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Old 11-23-2005, 07:46 AM   #3
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I'm a believer in flushing, but it'* easier for the 92-95 SSEi'* and other supercharged cars. We have the external trans coolers, so we can simply disconnect up front, crank some out into a bucket, refill, and repeat. The problem is that this still mixes fluid. And it'* dangerous and quite messy.

I don't think the hassle of doing it the way you propose would be worth it. I get my flushes for $80 locally, so you might want to shop around. I think you should drop your pan and change the filter first. Then flush.
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Old 11-23-2005, 09:28 AM   #4
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I'm in agreement with Willwren. Consider the filter and pan first. If you keep noticing fluid issues and discoloration afterward then go forward with a flush.
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