Originally Posted by SultanGris
I flushed and changed the tranny on a 1995 chevy s10 blazer once at 120K miles, the tranny promptly went out and cost me 2000$ to replace. Tranny guy said that changing the fluid removes the friction material from the oil and makes it to slippery and the old worn clutches then dont work right. Now whether he was talking about just that particular tranny or in general I dont recall as it was 6 years ago, but Ive had a ton of high mileage vehicles in my day, mostly fords, and this is the first one ive ever had a problem with.
Please don't take this the wrong way; I am only giving my opinion. The reason, I believe, your transmission went out is because you flushed it with 120k+ miles. I used to be a Honda mechanic and we would highly discourage transmissions flushes IF the vehicle had over 100k miles AND a transmission flush had never been done. What happens is, all the "gunk" and metal shavings that have settled throughout the transmission will "break loose" and flow throughout the transmission until it gets stuck again i.e. in gears, lines, etc. After a refill of fluid and a couple hundred miles down the road, catastrophic failure rates are higher than those that go without the flush. Now this, of course, is all subjective and possibly a little bit of speculation on my part because I have no analytical or statistical facts to back my argument. I can only go by my experience at Honda and that, in itself, is no where near the amount of data you would need to make a statistical "fact". Just my 0.02 cents...