Anyone running a 904 behind a 340?

Bakerlite said

That's a bit of a messy mixed up answer..
I think you will find, that's what happens when you use a valve body without rear band apply.
The sprag is not designed to take shock loading, no matter how many rollers you shove in there.
I have seen plenty of race built TF's with stock sprags in them and rear band apply valve bodies.

Click to expand...

Not correct. What I am saying is that all low band apply brakes are not created equal.
John Cope makes all his valve bodies, brake and manual shift, with the band on until you pull second gear. To get a clean 1-2 shift with no band overlap requires a billet low reverse servo with increased spring pressure to get the band off quickly before the second gear band comes on. Most standard low band apply brakes release the low band as soon as you let go of the switch. Perfectly fine if your car always sticks. If it doesn’t, there is still a risk off sprag failure, hence the justification for a stronger sprag.