Can flushing my 4.3 engine with ATF fluid damage it?

SOURCE: Chevrolet Malibu 2001 Transmission Flush or not

75,000 miles isnt alot of miles,unless they were mostly city miles. If you aren't experiencing any transmission problems,i would drop the pan,change the filter and whatever fluid the pan holds,and hold off on flushing the entire sytem.The clutches and bands sometimes don't do well when shocked with ALL new fluid that contains a certain amount of detergent.The only real problems i have seen with the total flush is on Dodge trucks of the 90's up to even 2000 and some later models,the transmissions use a governor pressure sensor,and solenoid,and i have seen many of them set codes after the flush,and the components having to be replaced with new.Black fluid isn't a good indicator.Brown fluid,is better than black.And red fluid is the best.

SOURCE: 2003 Chevrolet Impala transmission non-smooth shift

put a transmission line cooler on it

SOURCE: Transmission fluid flushing

In normal situations people do not flush their trannys. Your would normally just lower the pand and change the filter and replace the fluid that came out. If you are not having a problem with your tranny this is what I would suggest. As the fluid gets older the tranny gets "used to" the old oil that is in there. When you add new fluids the new fluid contains detergents that clean the internal parts as they circulate. Unless this is the first time you've been to the recommended mileage for changing the fluid (I.E. 30,000 miles) you could flush it. If you do not know the history of changes, or if you are at, lets say 100,000 miles I wouldn't recommend flushing it. When the new detergents clean out the parts they remove gunk that is actually helping the transmission. Don't get me wrong, you don't want a whole lot of gunk, but you also don't want to remove gunk that for example is holding a pin in place, so the pin falls out (just an example) I hope this wasn't too hard to understand, and I hope I answered your question.

SOURCE: tech recommended a transmission flush?

a flush involves putting an input on the transmission and an output.Then while the car is running or not put new fluid in while the old fluid is forced out. Replacing the tranny fluid is just removing the lower pan and gasket and replacing the filter. When this is done you lose only a fraction of the fluid in your transmission (usually just a 1/3 of the fluid the other 2/3 is still the old fluid). the flush also includes replacing the filter and gasket as well. The flush is a more thorough cleaning job of the transmission fluid. Im sure what you are concerned about is that is it really neccessary? the answer is : Most cases..no. However, If you get a transmission filter change have them show you the pan and magnet that is in the bottom as well as the transmission fluid. Normally there is a light dusting of metallic "sand" around the magnet..(it catches the tiny parts with the magnet). Now if there is metal shavings... thats bad. and the transmission isnt going to be saved even with a flush. Now have them bring some "Fresh new" transmission fluid so you can compare these two. Most transmission fluids are red of various shades, When transmission fluid goes bad it is usually "Burnt" the red then looks more Brown. It also smells very diferent (it will smell burnt) thats when a flush would really do your tranny some good. Transmission Fluid is actually Hydrualic fluid. It doesnt get broken down like engine oil does Instead it works until it is overheated. The filter catches most debris and the magnet catches the iron that the filter misses.If the new tranny fluid is more clearish than red but now its much darker then you can make an asumption that it is burnt. I hope this helps you in your decision making. Knowledge is POWER. dont be afraid of learning about your car. 8-)

SOURCE: I have a 2007 Chevy Equinox needing a transmission flush

It is best to flush the fluid this gets the fluid out of the torque converter.This transmission uses special fluid tpye t-Iv gm # 88900925 do not use dexron fluid in this transmission.