Okay, there's alot of people on this board who love to trash the TH700r4 transmission when anybody asks about it. I'm not trying to start an argument......but I am curious as to why some people think these are horrible transmissions. So the questions are: 1. How many miles do you have / did you get out of the original 700r4 in your vehicle? 2. If you have had one rebuilt or replaced, how many miles does it have on it/ how many miles did it last? 3. Where did you get the replacement trans / who rebuilt it? 4. What type of vehicle (modifications, etc..) and how is it used/driven? 5. If you have a different type of automatic (th350, th400, etc...) how many miles did they last? Here's the reasoning for the questions.............I've seen at least several people on this board say that the original 700r4 lasted over 100,000 miles but the replacement or rebuilt trans were only lasting 20-30,000 miles and therefore the 700r4 must be junk. I just doesn't make sense to me to simply blame the transmission design and that's why I'm curious to see how long the original trans lasted as compared to rebuilt ones. I have personally seen numerous 700r4's from a wide range of years and applications that all lasted well over 100,000 miles but I have never experienced having one rebuilt. I have also seen many th350 equipped trucks that required rebuilds at less than 100,000 miles. I have also talked to several mechanics involved with transmission shops and they stated there are several critical steps that need to be addressed when replacing any automatic transmission. One is that the all the lines and cooler must be thoroughly flushed to prevent contaminants from the previous tranny from quickly ruining a new one. The next is that the the adjustment of the T.V. cable is critical to ensure proper shifting and to keep the trans from burning itself up. Finally, it is common for the lockup torque converter to fail (as in stop locking up correctly) especially after a tranny fails. If the converter does not lock up properly it can also quickly burn up a new tranny and therefore they all recommended installing a new converter anytime the tranny is replaced. The converter can also be contaminated from the failed trans and is very difficult to completely clean out.