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I learned the easy way.
The transmission started slipping on my wife's 92 940 a few years back.
She was driving it to work and luckily made it the last 1/4 mile to the parking lot.
I went to look at it, cranked it up, put it into gear, and it drove away without any problems.
About a mile up the road, it starts slipping just like I had shifted into neutral. I cut the engine off and let it set for about a minute, cranked it back up and drove away again just like nothing is wrong.
Believe it or not, I knew immediately what was happening.
I drove the car the 15 miles to home about 2 miles at a time.
As soon as the transmission started slipping, I would immediately cut the engine and coast to a stop on the side of the road (luckily I live in the country), let it set for a minute and drive it away again.
When I got it to my shop, I drained and removed the transmission pan.
Sure enough, the filter was clogged with fibers...from the transmission clutches I suppose.
I cleaned the filter/strainer, and replaced the pan.
I then went to the nearest Wal-Mart and bought 3 gallons of Dexron II transmission fluid, took it home and flushed the transmission using the cooling lines at the radiator.
You can get the details on how to do this in the FAQ's.
That was about 4 years ago.
My son now drives this car, and there's been no problems with the transmission since.
These transmissions are almost bullet proof.
You don't want to drive the car with the transmission slipping, but it is possible to drive it a short distance the way I did.
I you were to just keep revving the engine without going anywhere, you would destroy the clutches in the transmission pretty quickly.
steve
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