92 f150 302 3.55 gears. is it possible to swap out spider gear without removing the entire diff? or does it come out as a whole and then can be torn apart? i broke 2 teeth off of the top and bottom spider gears. the ring has minor chips in it, but the pinion gear is a little hard to inspect.

 

Those can be replaced in the truck without doing any major disassembly, first remove the lock bolt for the main pinion shaft that goes through the center of the diff.. hopefull it won't break off.. be careful it's got locktite on the threads.. lefty loosy if you know what I mean. With that out that big pinion shaft will slide out with the diff carrier on an angle, and then the spider gears will come out of you spin one axle a little. Be sure to put the replacement gears back with the same shims on each side.