At what HP/TQ do you guys feel it will be necesary to make the move to billet tranny shafts?

I'm not talking 20lb 4x4 launches. The hardest my rig will work is either pulling my 12K boat or the occational drag race.

 

When your flywheel torque reaches 950 lbs/ft or above by the looks of your mods you should be alright they are very pricey

 

I know the EZ (even on 6) is fine. I'm just trying to do a little planning. The next drivetrain upgrade with be a TQ & VB. Then comes either a Juice or TST. Then a turbo.

If 950lbs is the limit, then stacking the Juice or TST with an EZ is in the danger zone (enough to twist one of the tranny shafts).

 

Give me a call if I can help you out I have BD power billet torqueconvertors and valve body's as well as the input and output shafts

 

I would get a billet input at least.
But many make it with no shafts if there is no boosted launches.
I ran around with 500+rwhp with an auto for about 2 years with no billet.