So I bought this thing last September and I'm back into full DIY mode. It's a 2008 with 60K on the clock. It was a highway vehicle before I bought it and "maintained." My dealer bought it at auction and he has been my goto guy, before you ask we are friends and have a history together so I trust him. The only problem I have with it is a intermittent rough down shift. These shifts have been very intermittent and I can't replicate them, but when they happen it sounds like I'm gonna drop my tranny, it's usually off an acceleration and a let off of the gas. Any advise would be appreciated. I told my buddy and he has been changing a quart or two of fluid at a time by sucking it out and replacing it. I've had mixed results as the banging goes away and eventually comes back. It's not alarming to me since it doesn't happen every day, but I wanna hear what you guys think. Regardless, I wanna change spark plugs (gap requirements?), full tranny fluid, maybe transfer case, oil (obviously), and anything else you guys can think of?
2008 Silver WK Grand Cherokee/ 3.7L/ Weather Tech Mats (Both Rows and Cargo)/ Flowmaster 40 Series Delta Flow/ K & N 77 Series CAI/