408 and turbo will make quick work of any 4l60e.

 

My 4l60 held up for one month with my lowly STS kit at 5psi....it won't last.
A 6.7l with an 88mm turbo on it will kill that trans quickly, unless you never take it over 1500rpm.

 

Turbobeerseker ran a FLT level 5 in his SS behind a 408 and was making just shy of 600 AWHP if I remember correctly. Seemed to be holding. It all depends n how you build and drive the truck. Put crappy tires on it and it will live for a long time, The thing you will break the most is traction

 

Trubo even posted the truck was down for 3 of those months along with the truck detuned and being very easy on it, to make it last that long.

 

Go 4L80e or go home... on a tow truck... LoL