Griner was the original and best you could get at one time. The Tranzact is a copy of the Griner with some minor changes. The first TCIs were junk and they started buying from Tranzact, but with Joe's sketchy delivery times, don't know it that is still true. A&A, Pro-Trans and CRT are all the same. Coan has one, but it looks identical to the one TCI now sells.

The fastest ones are fluid exhaust, like the A&A. As of right now, Griner is the KING of the TH400 valve body and supposedly he is incorporating what he learned there on the Mopar brake, but don't know if that has happened yet.

So when it comes right down to it, there may SEEM like a lot of choices, but not really

Monte