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Slipping Trans, Should I change the fluid?

2K views 14 replies 11 participants last post by  1971BB427 
#1 ·
Well feller, my 1999 Buick with 302,000 miles is stiffening from a slipping transmission. The trans that's in it has about 200k on it and still drives just fine but most certainly is slipping. I wanna try ad change the fluid and see if that helps, but I also know that changing that fluid could seal its fate and push it over the edge... What are your thoughts about this? Trans is a 4T65E, V6 supercharged FWD, just my daily driver.
 
#4 ·
The wear has happened already - and you can't 'put it back' from a bottle of ATF. Maybe one of those miracles in a can would work for a short time but those are usually no more then a viscosity increaser with a detergent and something to expand the seals - and may cause more harm then good
 
#7 ·
I agree with all the advise above, changing the fluid will probably not help. But check the level first.
A few years ago, my Ford Aerostar was slow going from reverse to drive, when it was very cold. The fluid was low, and adding some made the problem go away. The problem also went away when the transmission warmed up a little. My theory, the fluid was slightly low, and when cold, the fluid contracted enough to go below the minimum amount necessary for proper operation. No need to warn me of impending transmission failure, that was at least three years ago, and the transmission is working fine ever since.
 
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