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Transmission fluid change-which method is better? - READ ONLY

99 messages,  Last post on Jul 10, 2002 at 6:37 AM

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#94 of 99 transmission fluid by bryand21 Jul 08, 2002 (8:05 pm)
I have a 1995 GMC Jimmy with 157,000 miles. I had the transmission fluid checked and it looked REALLY dirty. However, the truck is running fine, no slipping, no leaks or hesitation that I can tell. You want believe this, but I can't remember ever having the transmission fluid completely flushed, only drained from the pan and a new filter and I can't remember when that was done. Bad memory!! Can I have the whole system flushed with new fluid or will this start to cause problems since I have so many miles on the truck and the fact I can't remember when anything was done to the trans fluid?   Please Advise!!!!!
#95 of 99 Drain and fill by armtdm Jul 09, 2002 (5:00 am)
I would do at least two drain and fills maybe 100 miles apart. the flush may be too stressful and cause problems at this stage
#96 of 99 Tranny flush by bburton1 Jul 09, 2002 (7:44 am)
I saw a ad for a commercial tranny flush system and they sold the flusing fluid for so much per 5 gallon container. Wonder how much of that "solvent" remains behind. Also what does it do to the clutches and seals in trannies. Think it is probably a very risky operation.   Several people I know have said to completely change the ATF, disconnect the ATF line to the ATF cooler and divert it with a flexible tube to a large clear container, start the engine and fill at the same rate as the drain container fills. Sounds like a keystone cops maneuver but it might work.
#97 of 99 assuming you CAN, it would work by swschrad Jul 09, 2002 (11:02 pm)
another way to get that done if you figure on doing it more than once a life is to fasten a matching pipe fitting and tube to a bucket (braze to a galvanized pail??) and fill that with new tranny fluid of the proper variety. you will have to have somebody to yell at you to > STOP! < before the bucket goes empty. I have not tried this, and probably won't.
#98 of 99 by alcan Jul 10, 2002 (3:42 am)
The line to disconnect is the return (upper) line from the cooler at the trans. This cleans out the cooler as well.   Regarding elaborate schemes re brazed fittings on buckets, etc, to refill the trans, forget it. Pump suction is from the lower sump in the trans, which coincidentally is where the filter is usually located, not from a cooler line.
#99 of 99 by wain Jul 10, 2002 (6:37 am)
I like the just drain it method. lots of chances to disturb dirt or do something wrong with the filter change method.

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