Mike, I still have the manual box off of my 77 FJ40. I removed it when I did a power steering upgrade, but it was working great (about 100k miles at that time). Should be the same as a 76. It is yours if you want it, if you want to delay or eliminate rebuild costs.
Sascha Steinway TLCA # 20217
1977 FJ40 "Ripper" (because it shreds!) (What is a "shread"...Steve Crase)
1988 FJ62 "Dino" OME, now in the hands of my daughter
2013 F-150 "Black Ops"