had a set of the tri-y's on the street dart. 451 low deck .600 roller cam. would not run at full throttle. ran high 11's. put on 2" tti 10.88. #3400 3.91 gear
I just switched annd will tell you that the difference in the ease of service and installation is beyond night and day. The Schumachers can be installed with the engine bolted in place with the torsion bars in. only have to pull the starter. This takes about an hour or 2.
My tti's have 2 days invested into them and i'm still not done (not 8 hour days though..)