edge comp is probably the best general "box"...not the highest hp or most aggressive, but very good nonetheless (especially with a drag update). an ez can be had for cheap...the problem becomes the transmission.
you have the auto? it's model # 47re with 4 speeds and lockup. they are a very mushy/shlushy feeling transmission from the factory and it hard to tell when it shifts for some people.
btw, where in NH are you from?
New England Turbo Diesel Power
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01 3500 HO 4x4 sport that lived up to my name "sooter" - traded
04 2500 CA/235 graphite QC shorty 4x4--53Willy's intake, 4" TBE w/resonator, custom built downpipe, 2nd gen exhaust manifold, and a mild box, 285/70/17 Hankook Dynapro MTs.