TrinidadLR4
Full Access Member
Greetings. Recently, I've read about a process that some people are following when changing their ATF in these ZF 6HP transmissions. It consists of disconnecting the transmission lines at the oil cooler, having the outlet dump into a 5gal bucket and the input be connected to fresh fluid. The engine is started and then the transmission pump cycles the fluid through and you stop when you see fresh fluid coming out into the bucket(I could be getting some of this wrong but that's the gist). Has anyone tried this? It seems superior to a simple drain, as you get everything out of the torque converter, etc. You then follow the procedure with the proper fill procedure. Just wondering if internal lubricity is ever compromised but if you don't shift gears while doing this, it should(theoretically) be ok? Any thoughts welcome.