Stock 904 input shaft and 5k transbrake

I got one 904 that i have using with a transbrake since 1994.....probably hundreds and hundreds of passes on it....car weight is around 2900....but normally used a 2 step and delay box at 3000 rpm.
Thanks to both of you guys I was hoping for at least one of you to reply and I got both of the pros
I’m gonna keep on the same path
With the lights I’m cutting I can be somewhat competitive. man those shafts are a ton of money
Now that our local index series allows delay boxes in the class I suspect the class will be flooded with light Chasis cars that will be killer on the 4 tenths protree
Should be a great race season!!