GM damper assemblies cause converter contamination In past issues we have reported about the importance of cleanliness. Never has it been more true than with the GM 298mm damper.
All GM dampers provide many hiding places for worn metal particles and clutch debris. Even after the most careful cleaning process, the debris stays behind lurking in the shadows and waiting to attack the freshly built converter. This contamination is found repeatedly in the pan of the rebuilt transmission with only a few miles on the vehicle.
Upon disassembly and inspection of the damper assembly, it is amazing what can be found. Worn and broken springs along with a paste like metal debris that were not cleaned out during the cleaning process are almost always present in abundance.
Some of the higher quality rebuilders will replace the damper springs with new ones after cleaning the assembly and then riveting the components back in place.
If you choose not to replace the springs with new ones, you can purchase a spring tester and verify that the used ones are within specifications and can be used over.
Quantity rebuilders may choose to replace with new due to the low cost of the replacement springs in bulk. This is also a practice that many rebuilders use for Chrysler torque converters. It is not worth the chance of the come back compared to the price of the springs.
Many rebuilders will argue that the cost is hard to recuperate from the customer, and that they would have to raise the price of the converter. The cost of one comeback and damage to your reputation is much higher than the cost of the springs. Your customers will thank you for making them a better torque converter.
Found in issue 04, 2004