I didn't care for my experience with Drivetrain.com.
The guys at southern gear are great. Pick up the phone and talk to them.
If you're going to replace any of the blockers/synchros, you'll need 2 new locking nuts for the output shaft and the counter-shaft. Ford says you need a "staking tool" but that's a bunch of poop. a flat head screw-driver is a multi-purpose tool that works just fine.
NAPA sells the gears individually. and I'm guessing southern gear might sell the seals individually, but I wouldn't bet on it. I purchased the kit when I rebuilt mine.
Also, if your friend doesn't have a tool for removing the rear bearing you'll have to get one or make one. I made one from a left over shock cylinder (when I built my Koni inserts), a long threaded rod, a nut that fits the threaded rod, a washer and a 3-jaw puller. I had a local muffler shop weld it together for me. There's a post around here somewhere, with a picture. maybe members section???
If you're removing/replacing the forward most bearing on the input shaft, you'll need a new plastic oil pick-up. You WILL break the old one taking it off. If you don't, PLEASE let us all know how you did that.
Also, get the expensive pilot bearing from Autozone, NOT the $12.00 one. The cheap one is made in China and rattles around when you hold it in your hand. The expensive one is TIMKEN??? regardless, it's the same one ford sells.
Inspect the gears/teeth where the gears engage with the sliders (big steel rings that the shifter forks grab onto). If those teeth look like they've been hammered on, get new gears. Or, you'll later become UNABLE to get into gear.
LASTLY, when you change the blockers/synchros, you'll have to measure the fitted washers at different points along the transmission. Get ahold of a shop manual for the proper procedure. This ensures that the trans is properly fitted along the output shaft. I installed the glue/sand synchros from Southern Gear, and wouldn't you know it.... my 5th/reverse-gear synchros were way fatter than the stock ones. It really sucked having the trans back up in the car before I realized that I couldn't turn the output shaft when the trans was in neutral.... ARRGHHH!!!!
P.S. those sized washers can only be measured for, and subsequently purchased from FORD, at certain points along the rebuild procedure. So, you'll have to install some gears, measure with a feeler gauge and then order the right washer. THEN you can install some more gears and measure again and purchase and install a subsequent washer.
BUT.... this only applies if you want to do it 100% totally by the book. Otherswise, just change what you want and make sure it spins freely in neutral before you put it back in the car. ;-)