Keisler 5 speed info

I wanted to get one until I talked to a guy on Moparstyle. He had an E body ( I think it was) with a 500 hp big block in it. He didn't even get one full pass out of the Tremec because third gear let go on a shake down pass. To add insult to injury, Keisler wouldn't warranty it because he "abused" it by taking it to a race track. Kinda shady IMO.