NB4567

II have an 02 5.3 and I believe I have both oil and transfer case leaks and am having trouble finding the source/cause of both of them. The oil leak is small and I haven’t seen anything on the ground but when I checked the level on the dipstick it was low. (It was at the proper level when I last changed the oil, about 2000 miles ago). There is also oil all over the drain pan. I’ve found small puddles of fluid on the ground and it is dripping from the bottom of the transfer case. It drips very slow, only a tiny spot on the ground about half an hour after running but overnight I put cardboard under it and there was a small puddle collected there. I haven’t had any problems driving.

I’m looking for rear diff fluid for my 02 Silverado 1500 Quadrasteer. I ordered the ACDelco Dexron LS 75W-90 that is listed in the owners manual through Amazon and the order never shipped. I’d like to avoid ordering anything from a third party seller so I was wondering what my best alternative would be. I’ve seen a lot of people recommending amsoil but it’s not sold through anywhere other than them and I would prefer to get it from a store like AutoZone instead of waiting for an online order again. Does Valvoline or Mobil1 have a good alternative?

I have a 2002 Silverado 1500 Quadrasteer. The Quadrasteer stopped working a little while ago and still doesn’t work with a new sensor. Does anyone know what scanners will work for reading codes for Quadrasteer? I’ve seen a lot of people saying you need a Tech 2 scanner but I’m not willing to spend that much money on it.