TCI has had issues with their transmissions. My son bought one for his truck and it failed after a very short time. Expensive lesson. Just because it has low miles does not mean it was built properly. Some who build transmissions do not replace the bushings. They just slap in new clutches & seals and shove it out the door. They will likely survive the low warranty given on those units. If the fluid is at the correct level, then I would pull the pan and have a look at things. Might even pull the valve body and see if anything looks awry. The alternative is to have a local builder who KNOWS WHAT THEY ARE DOING go through the unit. Good qualilty clutches, bands, and seals are not that expensive. You would then have a trans that would perform as expected, and would likely last a long time.
