Reverse 4 link

cool cool.

I have one, and several problems occur. Most notably pinion angle change. Dont do it.

Pinion angle change has nothing to do with it being reverse, that's just bad set up. You can have bad pinion change on a forward 4 link if it's not set up properly.

Yeah true that, gotta build your setup properly or else your pinion angle will be off, you can alway adjust it too as you have adjustable link ends.