So my 4L80e I picked up only had 70k miles on it. Dude drove it home from auction in Columbus Ohio about 2 hours to his house with zero problems then we tore the truck down (horribly rusted body and frame that wasnt worth savin). Yall think I should go ahead and change fluid n filter or just top it off after I get it in truck? I'm leaning toward a fluid n filter change since its low miles but fluid is still pretty decent red.