Hey guys, I am new to K5 and this is my first post. This is about my '86 K5 Blazer 4x4 (full size). The truck is my daily driver so I gotta get it fixed pretty quick, but most of the shops around here want $500 just to find out the problem. If I had a few ideas about want the problem is I might just fix it myself. Anyway here's some background. I bought the truck 3 months ago, the tranny was rebuilt/beefed/updated/transgo shift kit installed. According to the shop receipt I have it was done 6000 miles ago, but over a year has past so the warranty is expired. Plus the tranny shop that did the work is 600 miles away. The truck and tranny have been working flawlessly since I bought it. Here's the problem. Today I was driving to work and after 10 mins of driving I start hearing a grinding noise over my radio. So, I start to make a turn onto a side street so I could pull over. As I slowed down to make the turn the tranny suddenly shifts down and when I complete the turn its like the tranny is no longer there when I went to apply the gas. I make a complete stop and try every gear, including reverse......nothing. Then when trying to place it in PARK it just grinds when trying to move the shifter. If the motor is off I can place the tranny in PARK, but the truck can still be pushed forward as if in neutral. I get it towed home and take my wife's Caprice to work. Now comes the weird part...... I went outside after getting home from work (9 hours later) to check things out and to try and figure out if its the tranny or the transfer case. Well.....I wanted to hear the grinding noise again so I fired it up and put it in reverse thinking it wouldn't do anything. Much to my suprise it engauged reverse and everyother gear too. Plus the grind I got when putting in "PARK" is gone too. I want to be excited, but I am still worried about it. I drove it long enough to get to operating temp, and its shifting and driving like nothing ever happened. I am worried it will leave me pushing it again if I try the 20 min drive to work. Just to be sure, I checked the fluid level on the stick is nice and pink and doesn't smell burnt at all. While playing with the transfer case and trying to shift into "N" on the T-case shifter I get alot of grinding, I can't even make it into "4L". This leads me to believe the transfer case is to blame. This Blazer is my first 4x4, so this whole thing is new to me. I always thought that the transfer case was "direct drive", but I guess it turns out there is a pump and planetary gear set in it too. To the best of my knowing, the transfer case has never been rebuilt and the truck has at least 100K miles on it. I am totally stumped. I am not a tranny/transfer case guy by any means, so I need your help. Any and all suggestions are welcomed and thanked in advance.