It's hard to explain this in print-... but this is a start.
Selector forks had about .010-.015" clearance when new.
The bit on the gears that wears is the dog teeth, if they are rounded off find better ones. New, they have a sharp edge on the front.
Check the synchro hub outer teeth too, same deal.
The 3 springs inside each of the synchro hubs get soft with age, this prevents good synchro action even if you fit new baulk rings- so spend $30 and change them.
Replace baulk rings if less than .020" gap to the dog teeth on a gear.
Inspect the mainshaft nose for wear and pitting, if worn get a new one or PM me for a possible exchange reconditioned one.
The layshafts wear, it's rare to find one worth re-using, so replace.
Replace all the bearings in the box, including the idler gear ones, to do a proper overhaul- (note the thin needle ones inside 1st, 2nd and 3rd gear hardly wear and are usually OK to keep unless corroded).
Check the 1st motion shaft circlip for wear, if only worn on 1 side turn it over, if on both replace it.
Diff bearings are often OK to re-use, they are big and run slow so don't wear much.
Check the diff pin for wear, if worn more than a couple of thou fit a new one. Fit new planet gears too, if you can find any.
I agree with what the good "Doc" has said but I am not impressed with the diff pins that are available and would reccommend fitting a cross/4 pin diff especially if you like to get a "little" enthusiastic when driving. The reason when under load it is spread across 4 pinion gears to the output shafts and doesnt have the wear on the "diff pins".
