You should have replaced the whole gasket kit if you broke them apart, not just the oring. Clean all the surfaces, I mean clean, clean. I had mine in for a warranty job, and they tried to reuse the gasket being cheap..... had a leak.
I had the drive off this winter, and you could see where the leak was. I cleaned every bit of dirt, sealant, glue, you name it until every inch was perfectly clean. Bought a new gasket kit and reassembled with a dab of grease on each o ring to hold them in place.................. WAALAA - no leak!!!
Most leaks are from poor surface prep. shouldn't take but an hour or two to fix yours up.
Good luck.