Thinking about a Gear Vendors OD. Can Anybody Give Some Guidance?

I have a GVOD, LOVE IT. I'd highly recommend one to anyone thinking about it. IT's a game changer.

But...I would not run on e behind a 4 speed. I'd get an OD manual trans first.
My buddy had the after market 4 speed (4th gear)OD gear set swap using the factory case. It worked well for him. I forget the final ratio, but like Kern Dog said, the gear vendors OD ratio just didn't quite cut it for the $.