Check with Arneson on a tranny. Their inline drives require a dropped, down angle output as well. They might reccomend a tranny that will hold up to more than 400hp and 4500rpm.
BTW, the 5000 series BW, Hurth, and ZF gearboxes all have a dropped, down angle ouput.
Gary

I am going to inquire with Huber about the trannys mentioned. I believe Twin Disc owns Arneson, so they should be aware of the available trannys.

If he's talking about no more than 500hp engines, then why not just re-glass the transome so a set of Bravo's would fit up? Wouldn't that be about a wash cost wise to new tanny's? Parts, resale, etc. would benefit I think. The take off parts could be sold to help offset the cost of the B1's.

i think he said he would put more HP in it if he could....

I was limiting myself to 500 Hp because that was a number I thought the trannys could reliably handle. If they could handle more I would build for more.Now I am being told by Twin Disc and the dealer they will not hold up to that, so I asked the question here to try to explore my options to handle more power. As far as re glassing the transom for bravos that is not something I would consider as this entire transom is new, never even been wet and I'm not really concerned with resale value. What I would really like is for someone with experience with these drives from when they were still in production to give me some idea of what these trannys can handle power and rpm wise and be reliable in a pleasure application. I've heard 600hp@5800 rpm, but I'd like some conformation before I start spending money and blowing stuff up, especially since the stuff coming apart would be obsolete drives and transmissions that are getting harder to fix.

I recall seeing a twin disc spec sheet. And the MG 502s were only rated at 4500rpm max, and I think 400hp. Most of their trannys are better suited for low rpm diesels.
Although I think the Kamma package usually came with Cyclone engines, 400-420hp and 5000rpm. That may be the maximum reliably.
Gary

You are correct in what they rate them at from the factory. The highest output KAAMA package that I am aware of was 425 HP from Innovation Marine. I was told that when racing them they were putting 600-700 Hp before changing to crashboxes with dropdowns for the drives. How reliable were they at those levels ? Were they rebuilding them every race, were they failing during races. It was also pointed out to me that those power ratings(from factory) were probably for near constant duty for thousands of hours which is why they could handle soo much more during short term use like a 500-1000 hour life. Make sense ?

Just got off the phone with Huber. He says not much can be done with my current trannys and even if I managed to upgrade them, the drives would be very close behind as the next weak link. He seems to think all would be happy at 500 HP. He also explained that the difference between these drives and the Arnesons that prevents you from using their trannys is that the Arnesons have built in drop boxes, so you don't need a trans with a drop.

Only the ASD6s and 8s are available with drop boxes. You still need a tranny, but it can be an inline without the requirement for gear reduction or full power reverse.
There are a couple members on the board with inline ASD drives (no drop boxes). You may want to post a question under:"What tranny to use with 600hp and inline arneson"
Gary

inline arnesons.....