Sad Story On a Gear Vendors OD

Maybe I am confusing them with something else. I thought it was the GV. It was a unit that allows "gear splitting" and I was almost 100% certain it was the GV unit. I've seen people complain about high high the OD ratio was.
I wish someone would come up w/ a good overdrive only , no gear splitting, that would handle 7-800 h.p. , not cost an arm and a leg ,
and not take a bunch of crazy assed machine work or use someone elses parts to install. (don't want much , huh !)