Guys have run the 4l80 not sure about the 400. I was looking at turbosmart 38 gates as maybe good idea with the 4l80 for more space. They are think a fair bit more compact then the tial 38s. And sure they are also high quailty.
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99TAWS6"DEATH WISH" :Iron 408/Aps tt, Lingenfelter GT-7 cam,Yt 1.8s,,Afr 225, Corsa catback,Fast90 /NW90,Zex direct port, Lonnies twin pump,60's(temporary),Asp,sfcs,Kyb agx,Hotchkis lcas/stb. Bmr torque arm/relo brackets,Spohn sway bars/panhard,RPM 4l80,Yank PY3400 ,Dana 60,TTM ,C5z06 brakes, HPtuners,Street pro cutout,Eboost2,Interceptor guages.
96z28 vert,97 Talon Awd Turbo ,91 talon awd auto turbo race car . | 
aps tt kit , th400 and transbrake question ???? 
