what trans does the 03 4.7 Durango have? is it the 45rfe or the 545rfe? I'm also thinking of getting a tune-up done on it, as its last tune-up was at 120k and is now at 295k. I'm curious if I should have a tune-up done on it while I have the engine pulled out for a rebuild. is there any symptoms of loose transmission bands ect? I don't want to spend the money if I don't want to. also, what is normal operation for the transmission, and what speeds should it shift into other gears. and how long it should take? I notice some shifts seem to be slow but that could be me. any help is appreciated.