GM technical bulletin 00-07-30-022C (automatic transmission) failure of reaction sun gear with only 36, xxx miles (2002 GMC Sierra 1500 4.8L). This appears to have been a problem for at least a decade with continual failures until GM upgraded the defective components in 2003. Repair estimates could be over $2,000. Cash available = $200. GM should take responsibility for known defective parts.

- Lake Elsinore, CA, USA

At 68,994 miles my truck lost 2nd gear, drive, overdrive and reverse. A new reaction shell was installed. At 90,027 miles and 360 days later the same problem occurred and a beast heavy duty reaction shell was available and installed.

- Imlay City, MI, USA

On Dec 8, 2003 I was driving at approx. 45 miles per hour when my transmission shifted out of gear and then after a few secounds it shifted into low gear, all on its own. There was a car traveling behind that almost hit me from behind. I pulled over and put my truck in park. I looked under my truck to see if any thing had come apart. I did not see any fluid leak or any loose parts. I drove my truck to the dealership in low gear. They took my truck in for repairs (38,127 miles). I was 2,127 miles out of warranty. The transmission was repaired and it cost $1,057.19. Today 3/30/05 on my way home from work the transmission does the same thing. I only have low gear and no reverse. This time I was lucky that no one was behind me when it happened.

- Morse, LA, USA