I'm currently trying to sell my Girlfriend's dad's 1993 Chevyrolet Blazer... my problem is I picked the vehicle up from her dad last night and I know the vehicle hasnt been drivin much or if at all in the 6months... but it started snowing yesterday got about 6inchs ( i live in michigan) the 4 wheel drive ingages and disingages just fine, but sometimes for no reason at all or coming to a stop u hear a gear like grinding sound, and you have to disgage the 4wheel drive before u can accelate. or move if your stoped... the sound kinda speeds up, but as soon as u disingage the rear wheels/2wheel drive works fine... can anyone give me an idea of what it could be and a price?? thanks