5 Star Ampli-Torc and clutch

I'm in the process of getting the bugs worked out on a 5 star pulling tractor. Tractor is 450 cubes. It has a 6 pad 12" clutch in it, and it will slip under a hard load. Is there a better option? I am currently checking into having one made, but am open to any suggestions. Also, at what point is the Ampli-Torc going to start slipping in high? Will the stock clutch pack be able to hold enough tension to not slip? Neither the torc or clutch gave any problems until I added about 15 cubes and freshened things up.

My clutch slipped like yours. Took
everything to a modern machine shop. He
put a FLAT surface on flywheel and
pressure plate. What to try put it in high
gear and slip it bad just before you pull.
Put a little heat in it. Workes for me.
Mike Sullivan who builds clutches for the
Chrysler teams had me try this.

ChrisQ,
You can just buy a better clutch plate and pressure plate. Custom clutches will rarely make the customer happy. When someone is into the clutch on a MM; I ask them what they are going to do with the tractor. If they are going to parade and farm; I hand them a woven clutch. If they are going to do more; I give them a four or six pad clutch with either a standard, or oversize pad. If they get crazy; They get a pressure plate with more than the standard twelve springs.
Clutch material is the place where you have to trust your supplier. If a guy wants a parade clutch for his UTU; I hand him the generic black clutch plate that everyone on ebay pushes. We all know who supplies them and they are cut from plate stock with a water jet. If the customer wants stump pulling performance with the smoothness of a dynaflow; he has to pay ten bucks more for a real brown molded clutch plate that has a grain, like wood. The brown molded friction plates feel like something grandpap would use because they are custom made just like what came in your grandpap's Moline.
There was one Five Star, with a whomped out 425 engine, that I supplied with an eight big pad clutch and hard squeeze pressure plate. He then moaned about "too much clutch". I reminded him that his old four large pad clutch was just gonzo. He insisted that the bad clutch "looked real good" and I had insisted on a six big pad plate the first time around.
A dirty or oiled clutch will never perform well after it is contaminated. Even dirty ceramic pads will slip when they get hot. No amount of cleaner will ever rejuvenate a contaminated friction surface.
I suggest you get the flywheel turned just enough to remove the glaze and level the surface. A new pressure plate will do wonders. Never use anything but pure alcohol, or flash dry brake cleaner, to clean a new friction surface. If the rag you wipe with is not good enough for your glasses; It should never be used for wiping anything you care about.
Just my two cents.
Charlie

Not to highjack Chris's post but since you mentioned clutch assemblies, I was wondering about the clutch in my G950. Im going to need to put one in it but I have always heard they dont stand up for a long period of time as there is a little too much power for that size of clutch. I plan on using it on the farm for general farm work and tillage such as disking and plowing. What would you recommend? Is there anything available that is a little stronger than what the standard clutches are? I dont need anything for tractor pulling but I dont want to use the tractor for 2 or 3 years and end up putting another clutch in it. Thank you.

A new clutch solved the problem. Old one was oil soaked. Never gave it a thought that with the PTO input shaft removed the rear end can throw oil through the transmission input shaft where it can seep through the pilot bushing on to the clutch. A little plug and some permatex ultra gray should have the problem solved. Torque seems to hold well.