I’m part way through swapping a good used rebuilt tranny into an XJ8.
When I removed the cooler lines I plugged them right away, thinking that if I didn’t lose any fluid, I could put the other trans in and not worry about the fluid level. Checking the fluid level is a pain, and I’ve never done it properly.
But, the fluid in the cooler is filled with black fluid, possibly contaminated from the failing gearbox.
So I was thinking to blow the old fluid out and carefully measure it, then put the same new fluid in.
How does that sound?