It is more than obvious to most folks I think that you need a torque wrench for this job like the book says. A torque wrench is going to be cheaper than a pan gasket kit I'll bet and that gasket kit is going to be a waste of time and money because the band 'still' will need to be torqued properly to work. Maybe you will find something else wrong inside, but again, the band 'still' will need to be torqued properly to work!
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail > Fired up the Subaru, went for a ride, about a mile from home the tranny