35=rubber fill plug 44=threaded fill plug
You may be able to buy a complete used axle for less than a rebuild, depending on what you need to replace. If your just putting new bearings and seals and your doing it yourself than a rebuild would work. But if you need R+P side gears etc. junk yard may be the ticket.
More info would help. (tire size, rear end type, dif. ratio, manual or auto, 4 or 6 cyl.) Maby this is the time for a gear drop, but dont forget about the front end if you change rear gear ratio.
Ted