I have a 2003 6.6l with a PPE Xcelerator level 3 and a PPE stage5 Allison build with the billet torque converter.
Three weeks ago I was towing about 10,000 pounds to California when for the first time ever the Allison started to get hot and overheat. I pulled over and did a quick google search and said a possible cause of overheating was too much fluid. I check the stick and sure enough it was too full. I drained off about two quarts and continued on our way. The transmission never overheated again. A week later I was driving around town, just the truck in Arizona this time and my transmission started overheating again. I came back home and did some more searching. I came up with a possible clogged heat exchanger. I drained all fluids and changed filters along with fishing out a small nest of aluminum shavings from the heat exchanger inlet. I had thought all was fixed once again. I made a unloaded trip to Las Vegas from Arizona with no problems at all.
This weekend I had problems all over again. I was heading from the valley up north through Payson with no overheating problems. Once I did get into the blue ridge area a noticed a little shuddering from the transmission like the torque converter was slipping. We got to our destination and I parked the truck for two days. On our way home today it started to heat up again over the 275 mark. I pulled over and the temperature did not go down. I started back on the road heading home and through all the mountains the temperature dropped back down to 210. getting back into the valley the temp went up again to over 300. I am having a hard time figuring out what the problem is. Tomorrow after work I will check for another heat exchanger blockage. Also If I apply the brakes and the gas at the same time the engine RPM will only go to about 1200 RPM. Could all of this be stemming from a bad converter? Transmission was built about 4 years ago.
Three weeks ago I was towing about 10,000 pounds to California when for the first time ever the Allison started to get hot and overheat. I pulled over and did a quick google search and said a possible cause of overheating was too much fluid. I check the stick and sure enough it was too full. I drained off about two quarts and continued on our way. The transmission never overheated again. A week later I was driving around town, just the truck in Arizona this time and my transmission started overheating again. I came back home and did some more searching. I came up with a possible clogged heat exchanger. I drained all fluids and changed filters along with fishing out a small nest of aluminum shavings from the heat exchanger inlet. I had thought all was fixed once again. I made a unloaded trip to Las Vegas from Arizona with no problems at all.
This weekend I had problems all over again. I was heading from the valley up north through Payson with no overheating problems. Once I did get into the blue ridge area a noticed a little shuddering from the transmission like the torque converter was slipping. We got to our destination and I parked the truck for two days. On our way home today it started to heat up again over the 275 mark. I pulled over and the temperature did not go down. I started back on the road heading home and through all the mountains the temperature dropped back down to 210. getting back into the valley the temp went up again to over 300. I am having a hard time figuring out what the problem is. Tomorrow after work I will check for another heat exchanger blockage. Also If I apply the brakes and the gas at the same time the engine RPM will only go to about 1200 RPM. Could all of this be stemming from a bad converter? Transmission was built about 4 years ago.
