My '88 K1500 has the 700R4 and its time to do a fluid/filter change. I use it mostly for hauling materials and towing with some occasional offroading. In the mountain west we spend a lot of time going up and down long grades. If you don't engine brake by down shifting the tranny you end up riding your brakes until you warp the rotors or they overheat and fade. So, engine braking is a practical necessity. While I've got the tranny apart I'm planning on putting in a TransGo 2-3 kit which keeps the fully auto function but allows you to hold 2 or 3 to any RPM. I think that'll be useful towing, offroading and engine braking.
Does anyone have any experience with that?