dropped the trans pan on my 96 Chevy plow truck, a 4l60 auto, for fluid and filter change. fluid was way burnt brown. no real shiny sparkles or solids in the drained fluid that i could see. new bright red ATF in after uneventful reassemble. going to shift like a new trans, right? now reverse is delayed and definitely not feeling like a solid engagement. fluid level is spot on according to the dipstick and proper check procedure.
i can’t believe that i’m now one of those guys who thinks that old fluid might be best left alone and if it ain’t broke don’t mess with it.
maybe i should have gotten another Ford- my mustang for your time spent here.