Auto Trans Fluid EXCHANGE MACHINES-Good or Bad ??

[Chevy454]

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------We made it to Arizona before the trans expired and had to go to a "chain" for repair or replacement. Trans turned out to be full of metal from as small as dust to as big as a pencil eraser. The "tech" immediatly stated that some of the pieces looked like chunks of torque-converter fins. Long story short the pressure involved in the fluid change had actually bent some or all of the torque-converter fins and initially caused the slight whine. As time went on the fins (now fatigued) failed and spread metal thruout the trans......POP...... Never again!!! .......Bill S

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I've heard similar stories as Bill's...I know on the Allisons in our newer GMs there's a procedure to flush them and change over to Transynd using the in/out lines of the tranny itself, that way it sees nothing *but* it's normal pressures...pretty basic, and I see no reason a guy couldn't do the same at home on any other transmission with a couple rubber lines and some just of fluid. As someone said above, I'd clean the pan first...