Myth Busters Please read!! - 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 11-14-2009, 10:32 PM   #1
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Default Myth Busters Please read!!

I'm about to swap trannies to my '96 SE.I was told on higher mileage trannies not to change the fluid.If its working leave it alone.I had this happen on my '89 Reliant where I changed the fluid it quit running about a month later. Now. My friend who is more familar with trannies says is this is false. He always changed them with no probs. What are your opinions on this.

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Old 11-14-2009, 10:35 PM   #2
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If it'* got 100k+ or so on it, I don't change it.
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Old 11-14-2009, 11:05 PM   #3
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Is this a fact or your opinion & why?
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Old 11-14-2009, 11:15 PM   #4
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Alot of people have indeed had problems with older trannys, with high mileage fluid, when they "flush" a tranny. And this seems to have carried over to changing it, I have seen posted that advice here and there. The best thing you can do for that tranny is drop the pan, change the oil, and replace the filter. But I would not flush it. Thats just going to bring up crap from deep inside every cranny and make a sludgy mess. Fact'* are a hard thing to state in the realm of a transmission that old. They are complicated pieces of machinery and so many things can lead to a failure. One thing for sure is older tranny with high mileage oil don't do well as an average.
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Old 11-14-2009, 11:27 PM   #5
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Quote:
Originally Posted by onesweetride View Post
Is this a fact or your opinion & why?
Opinion. And I hold it because it'* what my ASE Master Tech step-father says to do.
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Old 11-14-2009, 11:35 PM   #6
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I can understand your view Mouse given who gave you the advice. This old snake has been through his share of automatics, never had a problem just dumping and filling. A few seem to move better. A 76 Dodge truck with all but totally clogged filter was quite a big improvement. Like I said, Automatic transmissions can trash in many different ways, and not something your going to get "Facts" about. And mechanics are like Lawyers. You can line up 10 of them and get ten opinions. LOL
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Old 11-14-2009, 11:54 PM   #7
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I've always done a drain, pan drop and filter change and never experienced anything other than smoother shifts and better performance through the power band. Having had friends that have done both the pressure flush and chemical flush, they have ended with major repairs or replacement because of internal parts. As Venom stated, the flushing usually moved debris and pieces and they get stuck in areas that restrict pressure or cause further damage.
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Old 11-15-2009, 12:00 AM   #8
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What I have heard is it'* not a problem dropping the pan and changing the fluid and filter. But not to do a flush on higher mileage trannys. Doing this can remove varnishes causing leaks and slippage.
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Old 11-15-2009, 03:55 AM   #9
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What would you consider high mileage? My 05 GXP has 71,000. I bought the car a few months ago and don't know if the tranny has ever been serviced.
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Old 11-15-2009, 08:11 AM   #10
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Oh,how about 214k+ miles.I know,I know it should proably
have a rebuild.No problems with engine or trans currently.
Problem is the car I want to go into has only 123k with also
means it may have a stronger engine
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