8 3/4 Evaluation guidance.
Any details I should know from those with experience?
If you pull it apart you would check the third member bearings and gears, no need to pull IT apart, unless you find something wrong. While it's apart you might consider replacing the axle seals and repack the axle bearings. If it has the factory roller bearings, you can clean them and repack them right on the axle, you will need a grease needle for your grease gun to get grease packed into the bearings, definitely want those greased well as they get no lubrication from the gear lube. It appears it's been apart and has different axles, so you might have Green Bearings instead of the Timken roller bearings, depending on who did what before you.
Some caution should be exercised when installing new seals, and then when you install the axles as the splined axle ends can damage the seals if not careful.
All you will need is a dial indicator and a magnetic base when putting it back together, to adjust axle end play. IF it has the Green bearings I mentioned then there is no adjustment.
Of course checking the wheel cylinders and all brake hardware and lines would be done also.
If it's a suregrip, be sure and use friction modifier when filling the center with gear lube.
