davids2toys Dave you said nothing about a leak??? Where is the leak? This will also tell us if we are pulling the trans for a repair. Rear yoke seal can be done in the car. If this is it check out the tailshaft bushing for play. Might need to replace that too. Top cover is a gasket, rtv will work fine if the surfaces are clean and the area gets a 24 hour total cure time. The rtv need to be at a min temp also. Might have to heat the garage to get a good cure. Shift fork seals are easy. The only seals left are the front input housing seal or tail shaft gasket. Would be easier to do on a bench. As far as the
oil, recover it and save it after repairs. Run it through a strainer for any partials. As far as finding GL-4 gear lube. The only other place mighht be at a truck stop. The small amount of mixing fluids is not going to kill the trans. Rick L. Ps Dave happy holidays.