Transmission flush question.

[SierraScreech]

Anyone know what pressure is used when a transmission is flushed with that flushing rig at the shops? Hook up points? Anyone rig up something at home that works just as well? Proper procedure, tips?  Thanks.

[CamGTP]

The new machines apply no pressure, they are hooked up to the factory cooler lines and the transmissions fluid pump will do all the work.

 

If you are doing it at home and have a dipstick tube it's pretty easy to do a fluid exchange. I pop whichever line is the return off, stick a hose on it and put that hose into a jug. Start the truck, let it pump out 3-4 quarts and shut it off. Then fill the transmission back up and do it again.

[Black02Silverado]

3 minutes ago, CamGTP said:

The new machines apply no pressure, they are hooked up to the factory cooler lines and the transmissions fluid pump will do all the work.

 

If you are doing it at home and have a dipstick tube it's pretty easy to do a fluid exchange. I pop whichever line is the return off, stick a hose on it and put that hose into a jug. Start the truck, let it pump out 3-4 quarts and shut it off. Then fill the transmission back up and do it again.

This method works well.  Only issue is if you have 2014 or newer where there is a thermostat on the transmission line.  

[CamGTP]

I ended up pulling the top trans cooler line out of the radiator on my 2016 because of the thermostat on the transmission.

 

It's a snug fit to get a hose on that cooler line but it's do-able.

[SierraScreech]

No dipstick on this rig. I'll have to look into this more. I just want to be sure of things.

[SierraScreech]

I wonder if I can rid of the thermostat on an 8l90 like some of those vids on the 6l80?