I've seen the insides of a lot of transmissions - agreed a neglected unit will take 50 gallon to flush "clean". I have dropped the pan on units that have been maintained and they look like new on the inside. Transmission fluid is extremely high quality detergentated oil and carries lots of "dirt". If you have buildups of deposits in a transmission you've neglected it.
The "filter" doesn't amount to much in most transmissions. In most transmissions its an encased screen - not a filter. If your transmission is wearing like it should the screen will never need to be changed. The clutch packs and bands should wear with such small particles that the wear material (grit) is so small it passes through the screen. If you have chunks clogging the screen you need to rebuild or replace the transmission - not the screen.
I'm big on constantly changing my fluid keeping it "fresh". On my Tahoe I replaced the pan with a deeper pan and drain plug. Every couple motor oil changes I drain the transmission fluid and refill. It gets about half the fluid with every swap. I installed a drain plug on the factory pan on my F250 and do the same with it. The E4OD transmissions need fresh fluid or they cook the oil and it gets to thin. The low pressure due to the thin oil creates even more heat and breaks the fluid down even more. The fluid is "dark" every time I change it but its still red. On my Taurus and Impala I can suck the fluid out through the dipstick hole and I change about half the fluid every 10-15K.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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