I'd never pulled a trans in my life and then jumped into building my truck. it's all about doing your research, following the steps, and planning on things going wrong (aka: having extra time and money available for when a part won't fit or a bolt snaps).
my old peugeot would act up when the level dropped, but I had a slow leak out the rear seal. Every now and again it'd shift funny and I'd top it off and it'd be fine again.
according to his sig the truck is 2wd.
car-part.com should be able to find ya something.
cheap and easy.
bonus points if you have an airtight screw on lid for the bucket.
super bonus if you get a Home Depot bucket you can also use it as an orange emergency cone if you're stuck on the side of the road. (just don't do both uses at the same time)
when your truck really isn't a pickup anymore, the hitch racks can be a real lifesaver (note that this is one week into my 3 week adventure and the zipper on that "waterproof" rack bag had already failed )
some days my genius knows no limits. so I've been fighting with my bent tailgate on my bent bed for years now (push in with your body weight and yank hard on the handle at just the right time) and today it finally dawned on me I can just nip off the end of the latches. now it's a one-handed operation.
oh, and car-part.com can help with your junkyard searches.
also, also, you'll want to remember the year of the axle you buy, as the brakes/bearings/etc changed over the years
for your purposes you'd be missing the long rod that connects them and it might turn into a 2-man operation to slide the seat. or you can finagle something up.
the number can vary, but not more than .02
for example: 4.09/4.10/4.11 are all essentially the same. the number comes from dividing the teeth and those can vary a bit depending on axle size.
3.54/3.55 is the most common XJ ratio out there so it should be easy to find. 95-99 are the best