tci 904 or built 727

I'm currently rebuilding a 904 (with a lot of help from the guys at A & A).

The stock sprag in the 904 is riveted in, which A&A says is basically as good as a bolt-in sprag. I don't know what a 727 uses to attach their stock sprag, but its apparently not as good as either riveted or bolted.

If the sprag fails in first as previously mentioned, the drum is spun at engine RPM * first gear ratio, and if its a high stall car with a lot of torque, things are going to get ugly in a hurry. A&A says the stock drum comes apart under 10,000 RPM. Even with a 2.74 first gear, you're going to have to launch pretty high to get that to happen though.

Most peope tell me that the stock drum is ok until about 500 horsepower or so.

Steve