I have available for separate purchase or as a package,
Ring gear and pinion. This is a 3.545 ratio (stock GVR4). Can be used to repair a damaged diff, to convert an AT ratio diff to match manual gearing for either a 3 bolt or 4 bolt diff. Has one small nick in one tooth of the ring gear. Shouldn't pose an issue. $50 plus shipping.
Rear diff center unit. Open style, from a 3 bolt. Looks to be in great condition. $50 plus shipping (or make offer).