Aug 23, 2011 · I picked up a 2007 gmc 3500 last friday, I drove it 20 miles on the highway and it started to beep and tell me the transmission is overheating and to let the truck idle. I called the dealership I got it from and they took it back on saturday to work on it. the spin on filter has been replaced along with all of the fluid being switch (just .... But the transmission is a different story. Chevy Silverado transmission problems show up first as shift flares while you’re accelerating. Then the Check Engine light comes on for ‘loss of prime’ codes. Soon after, the transmission won’t engage forward, reverse, or both. Again, lack of maintenance is often the culprit. The Express 3500 passenger and cargo vans are available with a 135-inch or a 155-inch wheelbase 6T40 Transmission repair manuals (GM 6T30/6T45/6T50), diagrams, guides, tips and free download PDF instructions From oil. "/>2007 chevy express 3500 transmission problems