Last time I had quickie lube change the trans-fluid in the Dakota was quite 
awhile ago but they used a thing that attached to the cooler lines. Start the 
truck and it (the transmission in the truck I mean) pumped new fluid in and old 
fluid out. Seemed like a legit way to do things if you knew which connector was 
which at the cooler.
They didn't do the filter at the time which I realized later was a bad idea. 
These days I've got a guy who does it. He saves the old fluid for me which gets 
a second life in the grooming machines...

-Curt

    On Monday, July 29, 2019, 1:31:28 PM EDT, G Mann via Mercedes 
<mercedes@okiebenz.com> wrote:  
 
 The shop transmission flush machines I have seen connect into the
transmission cooler lines and suck the fluid out while pumping clean fluid
in, to somehow magically swap out the old tired fluid for fresh new
fluid... somewhere in the mix, a new trans filter is installed and pan
gasket, etc...

These machines are pretty expensive, even used, so the shop charge for this
level of service is pretty spendy, from what I've seen.
Might be cheaper to just do a pan drop and drain, new filter, fresh
fluid.... then do another repeat in 5,000 miles.. until the trans fluid
shows "fresh"....

On Mon, Jul 29, 2019 at 10:14 AM Buggered Benzmail via Mercedes <
mercedes@okiebenz.com> wrote:

> I need to change the trans fluid in my truck. Has about 120kmi so quite
> overdue. I don’t recall changing it but I might have at some point.
>
> I see it takes 5qt for a filter change but 11qt if the TC is drained. Of
> course there is no direct way to drain the TC. So I’m wondering if the best
> way to clean it out is to buy some cheap bulk fluid, dexron or whatever,
> then run a coupla drains and refills through before I put in the new filter
> then another dose of clean fluid. That would dilute the old stuff pretty
> well but unless I used “better” fluid to do the process it would get
> diluted quite a bit on just the last fill.
>
> What do shops do when they flush and refill?  Some kind of machine that
> somehow can flush out the TC?  How does that work?  Are there some kind of
> fittings?
>
> --FT
> Sent from iPhone
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