AT Flushing

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n2xlr8n

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Hello Everyone!

I grew up as a gearhead, building race engines for my street cars. A close friend of mine has made a very good living as a transmission builder- manual to automatic: Allison, nasty PowerGlides, Muncies and Toploaders. He's built every transmission I've used for the last 36 years (stock Expeditions to 1100 hp BBC powerglides to 500 awhp Subarus).

I mention this because I trust him; he is one of the brightest, most knowledgeable mechanics I've ever known, and I do 99.9% of my own stuff.

I hear a lot on this forum about AT "flushing"- I assume this is the procedure where the fluid change is performed by using pressure through the AT.

On that note, during a 4R75E build he did for me a couple of years ago, he mentioned his AT rebuilds went through the roof when the "flush" machines became the mainstream. His advice was keep doing fluid / filter changes just like we had been doing them for 40 years...

YMMV.
 
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n2xlr8n

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bigrig

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Good stuff, for sure- Thanks.

My intent of the post was to share one AT professional technician's experience and view of the routine "flush", rather than the filter/fluid change.

For sure, I just added those links because I totally agree with your friend who is a transmission builder.

I think servicing the 6R80 by doing a fluid dump/swap and replacing the filter is well within the capabilities of most DIY-ers too.

It is good to hear that someone who is an expert supports that stance as a reasonable approach for maintaining the transmission.
 
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