013 vs 016 transmissions

[Roy Wendell]

I'm looking at using an audi transaxle in an electric powered formula car that my university runs. It would be used in place of the very expensive Hewland gearbox that's currently installed. Although light, the Hewland has neither the correct ratios nor the torque capacity for our current power train. I know that the 016 fwd gearbox is being used sucessfully in mid engine v8 powered kit cars and I have experience with the quattro version so I'm trying to source one. The only problem is that fwd 016 gearboxs don't seem very common. I do however have a line on an 013 from an 84 coupe gt thanks to this list. What I need to know is what are the differences between the 013 and 016 coded boxes? They have similar application ie fwd 5 cylinder VAG products. I know that they have different gear and final drive ratios but is that it?

Roy