So just regular 75W-90? My D44A is non limited slip.
All i need is a slide hammer and bearing puller eh?
80W90 is the spec for the 44a w/o LSD. For HD use or tow package use 75W-140 full synthetic. Use a gear oil grade which has MIL-2105c and/or API GL5 spec and capacity is 4.75 pts. So you should buy 3 qts and will have a little more than 1/2 left over.
Yeah, once you put the slide hammer end in the axle tube it will remove both the bearing and seal at the same time. Make sure you use the adapter end which is just a little narrower than the axle inner-diameter so it will fit flat against the back of the bearing. Both Advance and Autozone has loaner slide hammer/bearing remover kits here so you should check locally.
The cross pin bolt head is a special size where you're supposed to use a e8 torx socket to remove it. But I found a 12-pt 1/4" box-end wrench worked fine so I returned the e8 torx socket I bought.
Most don't use any gasket when re-installing the cover and I just used ultra black RTV. But Permatex also makes a gasket maker just for differential covers as seen here
. It's best if you heat up the mating surface with a heat gun/hair dryer to bring the oil out and then wipe it down with alcohol. If you want remove the gasket again believe it's NAPA which sells a re-useable gasket where you aren't supposed to need any RTV.
Not sure if the 44a axle is deeper but I found the 4857 weird seal that Timken now makes wouldn't fit all the way in on my 35c. Would have rather had a lip on mine but the Timken 8660s worked fine. Good luck!
Note on the photo of the below Timken 4857 how the rubber seal is wider than the actual metal itself. This is the reason it would not fit in tight and was afraid after assembly it would loosen/or pop out. Thread w/text comparing the 3 seals (OE, 4857, 8660s) is in the 2nd link.