Ive been doing this for years in my older chrysler. Every 6 months i pump out 3 quarts, and dump 3 new quarts in. Smooth shifts always.

On silverado the wider orange tube fits in dipstick hole. If you do it when fluid is cold and has drained into pan overnight it works way better and faster ... drain container being lower makes big diff also ... and being parked with front downhill overnight tilts pan so more fluid is near dipstick where tube picks up ...

I bought the exact tool, and upon experiencing the same issues, I cut black thin hose shorter so the orange and black hose was in the transmission dipstick tube, then siphoned out, and it took me 30minutes as I poured some transmission conditioner down there to remove varnish build up, after all that I dropped the pan, inspected the filter and pan was no metal particles.. and refilled the atf on our 2017 GMC sierra 1500 slt 5.3 .. now it's time to do it to our 99 tahoe LT 5.7

Awesome 👌

That jug you are using to recycle the fluid, use the old cap on it. Cut a hole in it big enough to put the hose in it so you can keep the hose from popping out. I should hold the hose in the jug. If needed, put a small hose clamp in the hose UNDER the cap so it won't slide out of the cap, that's if you cut the hole too big.

That adapter to change the red hose to the black hose needs to be AT the pump. The work you're doing is right, but the design is wrong. You're trying to suck fluid thru a very small diameter hose into a larger diameter hose where the pressure does collapse the red hose. ALSO, this pump is $7.49 at Harbor Freight.

Did you do when vehicle was cold

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A 100 degrees isn't hot for a transmission my Silverado sits at 176 in my Silverado and the manual says that's where it's supposed to be

Throw the black tube in garbage, no need for it, if red hose is to short splice a short piece in it with a barbed fitting. the hole is to small in black tube.

My darn transmission reservoir is curved so cant get the hose down far enough