To flush or not to Flush - 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 02-13-2008, 05:35 PM   #1
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Default To flush or not to Flush

I am wondering if it is worth it to have my tranny Flushed rather than just changing the fluid, filter, and pan gasket. The tranny was rebuilt about 24 months ago and has been running great, I just want to keep it that way so I was going to do this as a routine service thing. The tranny fluid is still bee-you-ti-ful red and clear.

Any thoughts??
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Old 02-13-2008, 05:41 PM   #2
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I would find a warm place, drop and clean the pan, change the filter, re-use the old rubber and steel gasket, or replace the cork one, and top up with Dexron III.
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Old 02-13-2008, 10:20 PM   #3
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<----Lives in florida..surrounded by nice warm places LOL
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Old 02-13-2008, 10:30 PM   #4
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I read somewhere on teh club that having a flush is dangerous because most of the people that go to a shops and have it done are people with failing trannys that are full of shavings that get into the flushing machine, and unless the shop is good about keeping the "flushing machine" clean, you could end up with someone else'* shavings in your car. I simply drained and replaced the filter a few years ago, but now i have TCC shudder...who knows.
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Old 02-13-2008, 10:36 PM   #5
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If I REALLY want to get the thing clean, I run seafoam trans tune through it for ~100 miles, drop the pan, let it drain for like an hour, refill, drive around for a couple miles, drain, refill, and I'm good . I've never gotten a transmission flushed... could never find anybody with a machine in this city.
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Old 02-14-2008, 10:10 AM   #6
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thats why i was even considering it, because i know that if I drop the pan, I wont get the fluid thats up in the torque converter. But there is nothing wrong with the tranny since i rebuilt it, i am just shooting for preventative maintenance.
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Old 02-14-2008, 11:08 AM   #7
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Quote:
Originally Posted by lunchboxx
thats why i was even considering it, because i know that if I drop the pan, I wont get the fluid thats up in the torque converter. But there is nothing wrong with the tranny since i rebuilt it, i am just shooting for preventative maintenance.
How many miles are on the transmission? I understand two years and would change half the fluid by draining and refilling by the third year. The transmission started out with a full 12 quarts of clean, new trans fluid. You said the fluid is beautiful in color.

So for my car, emphasis, for my car I'd probably go up to 3 years unless I had 35,000 miles or so already. I'd also consider not replacing the filter unless I saw a large amount of gooey particulate precipitate on the oil pan when I took it off. If I were changing at 2 year and low mileage I'd change again in 2 and replace filter then.
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Old 02-14-2008, 11:47 AM   #8
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umm i guess about 15 or 16 k on the new tranny. after i paid to rebuild the unit, my wife got hit by a drunk in her car. because we had to get a new car, we bought a nice new one and we drive it almost everywhere now. Consequently, my daily driver get driven mostly to and from work and just barely gets 7K a year these days..
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Old 02-16-2008, 09:46 PM   #9
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Default Re: To flush or not to Flush

Quote:
Originally Posted by lunchboxx
I am wondering if it is worth it to have my tranny Flushed rather than just changing the fluid, filter, and pan gasket. The tranny was rebuilt about 24 months ago and has been running great, I just want to keep it that way so I was going to do this as a routine service thing. The tranny fluid is still bee-you-ti-ful red and clear.

Any thoughts??
Having spent mega bucks to have the tranny fixed on my "95 88, during the last filter/fluid change, I brazed a drain plug on the tranny pan. I now change what fluid will drain out every 7-10k. I know it dosen't drain the converter but I figure every little bit helps. You can buy a pan with the drain plug but they run $90+. "Bolt" in drain plug kits are also available from Jegs/Summit. While your swinging a bottle of ATF, get a turkey baster and change the power steering fluid also. My first PS fluid change yielded a gooey, black liquid. Couple more changes and everthing came out clean. I also added a tranny cooler to help keep temps down.
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Old 02-16-2008, 10:46 PM   #10
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Don't hesitate to do a flush if you want to. But I wouldn't do it more than once every two years on a daily driver. Once a year on a toy/race car.

I've never seen a trans fail from the old wive'* tale about flushing. I flush both of my cars once a year (professional flush, not in the driveway).
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