Has anyone ever heard of a "Pro-Shift" conversion? Basically it does away with the Synchros, and replaces them with a toothed ring that has one third of the splines, allowing you to bang through the gears at WOT.
It does complicate driveability, unless you're a truck driver and used to "floating" gears. The upside of this, is that a T-5 can handle a great deal more power than stock. Since I'm planning on putting over 400 horsepower through this tranny, I have to do something to keep it alive.
Since this conversion does away w/ the synchros, would it matter if I used a WC or not? that's the only difference between the WC and non WC isn't it?

 

You mean a face-tooth engagement setup like at the bottom of this page (http://www.glebe.co.uk/dev.htm)?
There are many more differences between the phase I and phase II T5's than just synchros.

Very little has been done to address the actual weak point of the T5 - the case, which is prone to stretching.

 

400 hp is a great power level at which to step up to a T56.

The T5 is like a Muncie. Do all the crap to the tooth angle and synchros you want. The case will still stretch, and the facts remain:

T56 > T5
Super T-10 > Muncie M-22

Period.

 

Dude, no way is a t-10 better than an M-22. All old school big horse big blocks came with m-22s. The 430hp 427 came with an m-22. That is the only transmission manual shifting 9 second cars run in old stuff. I have had 2 corvettes both big blocks both m-22s. My 309hp 454 was ok but my 66 425hp 427 is my favorite car I have ever owned. It has an m-22. enough said.

 

G Force sells a dog-ring type setup for the T-5, as well as a syncronized kit. Even the syncronized kit is rated at 600 HP/TQ.

No problems with mine so far, and I'm pushing 490 TQ....

T56 isn't a bad option either.