I want to use an ABS K75 final drive (37/11) (available on Fleabay) in a non abs application. 76 airhead R90/6 with modified K100 s.a., K1100 18" three spoke rear wheel sidecar rig. Will the ABS ring cause any problems or can I just remove it?

I presume you are talking about the ABS ring on the rear wheel?  If so just remove it.  From memory there are three screws.

Thanks.