is any running these drives ?

Yes, they are. Friend of mine has 36' Apache, wore out his first set of gears at 500+hrs. He runs it very hard. 825hp, vortec blowers.. Hope that helps.
Dick

thats what i want to hear going to put a set on the back of my cat

Well Mr Gadgets can hook you up

I have two on my 34' with 950 HP each. No problems yet and i don't baby it

just put them on my 38 with sc lowers, so far so good.

So far so good after adjusted linkage. Shifts very well. Weld need to get the prop height so the bullet is above the bottom.

ordered a pair today already have sc lowers wish me luck

Keep us posted on your results. I have a bmax ready to install but i am not above 700hp level...not to say i couldnt grenade it with that... Anyway, Going to finish this year out with the xr and swap into the bmax when i go 540 this winter.

Have two on my 33 Elimiator Daytona 1100 hp motors