What tranny does the TBSS use, is it the 4l65E? It seems to me with the power that it puts out and the weight ~4500 lbs that if it is a 60/65E than how can GM make that tranny work and why isnt the tranny breaking under that power like most of the problems we have making similiar power with "modded" 60/65E in our trucks? After 2 times blown, even when I get my built one im gonna cringe every time I mash the excelletor down, just wondering when its gonna break again.

 

TBSS uses the 4L70E (RPO M70)

Basically its a 4L65E with a few minor changes... The only thing i can think of is the imput shaft is a bit stronger.

And how they can make the TBSS not break trannys... its all in the torque management.