Anybody ever here of it?It flushes out the tranmission fluid.GM has it,I have about 50,000 miles & tow alot,I want to keep the GM warranty maintenance up.Thanks

Allison states not to have the trans flushed or any type of fluid replacement with a machine.
Drain the pan and change the spin on and refill it will be fine.
If you want better fluid go with Mobil 1 Delvac or Transyd. You can get them from Allison dealers or vendors here. Once you have done a drain and fill 2 times you can go 150,000 miles or 4 years before having to change it again.