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Originally Posted by Skydiver
1) I read that if you haven't changed the fluid in a long time, that completely changing it out (flushing) would be bad because it would break loose varnish or something in the engine.
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Nonsense. That may have been true when I was a kid 50 years ago, but it's not true today. Follow Mark K's procedure in the FAQ. Nothing is better than a complete flush of the tranny system with fresh ATF.
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2) Temps here are now around freezing for highs. For a flush (doing it myself), will I be able to get the trans temp high enough (just by driving on the highway for a while to bring the temp up to normal) so that the fluid doesn't puke out when I do the flush? Not sure what the puking is, but it doesn't sound pleasant.
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If you can drive it at least 20 miles before you stop and do the ATF change, you should have no problem of the ATF coming out the wrong hole. If it does come out the wrong hole, it's because either your tranny cooler is stopped up or your cooler bypass valve is defective. In either case, you need to do some repair work to relpace the cooler or the valve before you continue with the ATF flush.
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3) If I do the flush myself, does anyone have a picture of the actual line that I'll be hooking the clear hose to? I've seen the diagram on the FAQ flushing topic, but I can't tell by that which line it is. If you try to explain the line by where it comes from or it's purpose, you're going to lose me.
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If you can't find the cooler return line at the back of the tranny on the passenger's side of the tranny, then you should have someone else do the job. It's a 3/8th inch steel line coming from the front of the truck and going into the back of the tranny. There is a banjo connection where it goes into the back of the tranny, and the bypass line goes into that same banjo connection. But it's very easy to tell the bypass line that comes from the front of the tranny from the cooler return line that comes from the front of the truck.
