Usage of a NAG-1 Transmission behind a SL6

The NAG-1 Getrag built automatic transmission.
Coupled with a proper ration rear axle, it can take the torque, stock configuration, and the gearing ... the gearing isnt bad at all:

• 1st Gear - 3.59:1
• 2nd Gear - 2.19:1
• 3rd Gear - 1.41:1
• 4th Gear - 1.00:1
• 5th gear - 0 .83:1
• Reverse - 3.16:1

And there are stand alone controllers available. Reasonably priced in junkyards.
Also there are shift kits , shifters, and manual valve bodies .

Opinions?