I just purchased a 2007 sequoia as i like it better and I dont know how long I want to run my ford truck.I'm sorry to hear of your injury. Makes it hard to do any mechanical diagnosis, much less work.
In all honesty, if this were mine, I might not even fix it. I ran an old Toyota 4 Runner for over 100,000 miles with a rear main seal leak.
It leaked out about a quart every 1,500 miles, or it burned and leaked it, I was never certain.
At 700 / 800 miles per quart of oil used and driving 3000 miles a year. Adding 4 quarts a year or so is no big deal.
I crawled under my truck with powerful lights and could not see any oil leakage from valve cover or front or rear seals. Its a 5 speed manual trans. So its harder to hide a leak on the transmission side.
I was a professional mechanic for years. I can find an oil leak. And a quart every 700 or 800 miles leaves a drip.
Not seeing it in my exhaust. No smell of oil either.