Quote:

This is not what TransGo says...
The tech guy there (forget his name but he knew his stuff) said that the exploding sprag theory with 727's only applies to manual valve bodies that do not include a low band apply feature ...

That guy doesn't understand the problem, and he is dead wrong. Well, he is half right about when the selector is in manual low; the band will hold.

The biggest concern with a Torqueflite automatic valve body is the transmission (not the driver) downshifting back into 1st (and this never applies the rear band). In the wrong circumstances this can damage the sprag. Like when lifting and the tires stop spinning, the trans goes into 1st without low band apply (selector in 2 or D), and the driver hits the throttle. Or the tires grip, slip, grip, etc.

Then any time the selector is in "D" or "2" it can go into low gear on its own and the sprag won't hold, allowing overspeed of the front drum.