[Mark42]

Those are good points, BUT:

1) the OE aluminum shaft is working, and will fail under those conditions after time.

2) a good aluminum after market is $300 plus bucks.

3) all the parts in the drive train will fail eventually under those conditions.

So......

Its a mater of economics vs speed.

I'm sure he has race grade axles that he scored a line down and pulls and checks periodically for twist. After 5 or 7 degrees of twist, the axles are toast. They get replaced before they break, and the same grade axle is installed.

So why not do the same with the driveshaft? Score a line down the shaft, and race. Check it like is done with axles.

How many 6K launches does he have on the existing shaft? 50? 100? It will hold up until metal fatigue breakes it. A steel or aluminum OE shaft is cheap, and if it breaks after 100 launches, replace it with a nother after 75 launches before it breaks. Same as is done with any other stressed part in a race car.

These are hard times, money is not free, cheap parts will get the job done, just need to be replaced more often.

Or, do like you say, and buy an expensive drive shaft.

I doubt anyone here is making their living off drag racing, so this is all just sport and hobby to the members of the board. Money counts.

Just putting it out there.