Yeah I'm with you. RjVette should use your numbers. 18 ft-lbs seems reasonable now I think about it. The other numbers on the page make sense. I would agree that is probably a misprint.
I think I'll order that real shop manual now...
GM Shop Manual for 1986 Corvette says:
For driveshaft torque retaining strap bolts to 150 in. lbs.
For Trunion straps at side gear yoke torque 26 ft. lbs.
For trunion straps at spindle yoke torque 26 ft. lbs.