4L60E fluid return into transmission
I exchanged all my fluid in my 4L60E by removing the return hose off the transmission cooler and adding fluid down the dipstick at the same time while the engine is running. It was always within half a quart plus/minus so I don't think there was any problem there. My question is, a friend said Allison transmissions use the fluid on the return to lubricate, does the 4L60E need this lubrication when it's running, or does it just return to the pan? Does anyone have a diagram? Thanks!