hi all , new owner of an 05 tailblazer lt ext. 109k miles , clean and drives good. the truck did have a slight whine when A4WD was engaged on the test drive so I knocked off a few buck for that. I was hoping it was only going to be a fluid change but the transfer case fluid was almost black , so ill be investing in a transfer case this month. when the A4WD is engaged and and sending power to the front and in 4HI , the truck pulls to the left. since its okay in 2Hi I am not thinking alignment what else can I look for ? this is my first 4x4 , but I'm somewhat mechanically inclined , just need some ideas and pointers.