I was driving the truck today and it went to shift into 4th and revved to about 4500 and then shifted hard. I slowed down to see if it would do the same thing, it did the same thing except it would not accelerate after it shifted. It was like it was in neutral. I pulled over and it would not move in any forward gear. I put it in reverse, and it moved about 10 feet and jumped out of gear and wouldn't move at all. After I had it towed home, I got underneath it to look at it. I grabbed the driveshaft and was able to turn it about a half of an inch. After I moved it, it seemed to have locked in place (it would not rotate in either direction). Started the truck and had reverse again. So I dropped the pan, no big pieces of metal, just alot of metal glitter. Any ideas? It is a 2001 4.8 RCSB. The fluid was clean and full before this. There were no problems before this, drove and shifted fine. Thanks Chris.
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2000 Silverado ECSB- 5.3 CAI, Pacesetter LTs, ORY- Pipe, Magnaflow XL, E-fan, Ported T/B , Nelson Tuned, Built 4l60e, Circle D Stall, 3.42s G80, 2-4 Drop, Hertz Highs, Rockford 501s 
Originally Posted by LamboDoNoMo
