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Cattle Boards
Trucks, Tractors & Machinery
Automatic Tranny flush, HD gmc 6 liter.
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<blockquote data-quote="Earl Thigpen" data-source="post: 507947" data-attributes="member: 3999"><p>Flushing the transmission IS a good idea. Here's why.</p><p></p><p>1) The transmission pan contains only approximately 20% of the fluid contained in the whole transmission. The remaining 80% is captured in the torque convertor, oil cooler, lines, valve body etc. Flushing exchanges ALL the fluid, not just what is contained in the pan. When you either drain the pan (if there is a drain plug) or drop the pan you still can't get to the remainder of the fluid.</p><p></p><p>2) Particles of the friction discs that are eaten away over the years gets trapped in the valve body passages and more importantly, they get trapped in the vanes of the torque convertor. Since you can't drain or exchange the fluid in the convertor you never clean the trapped particles out of it.</p><p></p><p>3) Something happens to the transmission fluid over time. Not a chemist so I don't know what goes on there but it gets really nasty. It's carrying parts and pieces of the clutches and bands that have worn so maybe that's why the stuff gets nasty. Anyway, this goes back to #1 - you can't get to the 80% that really needs to be changed.</p><p></p><p>Hope this helps. Little long winded - sorry.</p></blockquote><p></p>
[QUOTE="Earl Thigpen, post: 507947, member: 3999"] Flushing the transmission IS a good idea. Here's why. 1) The transmission pan contains only approximately 20% of the fluid contained in the whole transmission. The remaining 80% is captured in the torque convertor, oil cooler, lines, valve body etc. Flushing exchanges ALL the fluid, not just what is contained in the pan. When you either drain the pan (if there is a drain plug) or drop the pan you still can't get to the remainder of the fluid. 2) Particles of the friction discs that are eaten away over the years gets trapped in the valve body passages and more importantly, they get trapped in the vanes of the torque convertor. Since you can't drain or exchange the fluid in the convertor you never clean the trapped particles out of it. 3) Something happens to the transmission fluid over time. Not a chemist so I don't know what goes on there but it gets really nasty. It's carrying parts and pieces of the clutches and bands that have worn so maybe that's why the stuff gets nasty. Anyway, this goes back to #1 - you can't get to the 80% that really needs to be changed. Hope this helps. Little long winded - sorry. [/QUOTE]
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Automatic Tranny flush, HD gmc 6 liter.
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