I thought the 2.8 box was a good one??? there used at the drags eg: V8 KILLER RB30 [email protected] creek 600Bhp pass's @ low 10's with a salisbury diff no prob as of yet and possibly alot more tho ranging from supra's box's tremecs etc my point is you have top loaders box's accompanied with 9 inch diffs with a big reputation of being very strong but are blowing up just as much or more (personal experience) then you have the tremec 6speed & turbo 700 out of vx commodore etc there not rated and have the occasional blow up in just a tradies ute stock ls1 ute at the same time you have legal 1/4 mile street comp racers throwing huge kw figures with brass button clutch's and big racing slicks at these box's tremec 6speeds n turbo 700's without fail...Hey mate,
I am no genius on this matter and there will be more knowledgable people along soon.
But there is no way on this earth that the 2.8 box will handle the power or torque from a V8 6.5 Chev, let alone a turbo version. As far as I know the 3.0TD and TD42T gearbox will both handle the Chev with out a problem.