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I don't know that the plug can be bought by itself. You could try Randy's Ring and Pinion.
You can buy a replacement cover with an actual threaded plug. https://www.bjsoffroad.com/Dana-44-Diff ... _p_76.html This is what I put on the rear of my CJ-6, and then put the CJ-6 cover with a threaded plug on my J10. I have a left-over cover from my J10 with a rubber plug, but I expect it's no better than the one you have now.
Randy's probably has a stamped steel thin steel type with a threaded plug.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Those are too small, I already bought one of those. They fit the later model Wags. I got caught out in the middle of Oregon when it got bad, ended up wrapping the plug with electrical tape to make it bigger.
I checked the diff oil before I left on my trip to discover it was in bad shape. It hadn’t leaked a drop in 10 months previously. The plug hadn’t been off in so long it had glued itself the the cover.
1964 Triumph TR4 with 1964 Olds 215 heart transplant
1977 Wagoneer
2009 BMW GS1200
A Big Thank You to Yeller who was kind enough to gift me a D44 cover with a threaded plug in it so I can retire mine with the leaky rubber plug.
(I'm going to be so bored when I get all the leaks stopped).
1964 Triumph TR4 with 1964 Olds 215 heart transplant
1977 Wagoneer
2009 BMW GS1200