I just picked this up today. It a Pro Motion T5 that handles up to 500HP. I got it used with just over 100 miles on it for $800, with the mount. 
The guy I bought it from couldn't find his original receipt/build sheet. He call up Pro Motion to get a copy for me. They asked why he needed it. He told them he was selling it. They told him to tell me if I need any help or have and problems to call them up and they would be glad to help me out. Sounds like a great place to do business. Here is a link to their site. It's the top one that cost $1290. It has .59 OD gear instead of the .68 stock. it will be much better on the highway @ 70MPH. 
ProMotion Powertrain
The guy I bought it from couldn't find his original receipt/build sheet. He call up Pro Motion to get a copy for me. They asked why he needed it. He told them he was selling it. They told him to tell me if I need any help or have and problems to call them up and they would be glad to help me out. Sounds like a great place to do business. Here is a link to their site. It's the top one that cost $1290. It has .59 OD gear instead of the .68 stock. it will be much better on the highway @ 70MPH. ProMotion Powertrain
