Chevy Astro differential oil

[sr17]

I would like to change the differential oil on my 1994 Chevy Astro. it has just reached 200K Miles, I don't know when, or if at all it has been changed before, so lets just say it is due

I do a fair bit of boat towing with the van and would like to put some good oil in there - what would you recommend?

Is anyone able to tell me the recommended grade and capacity? I don't have that info either.

The differential appears to have some wear, which I guess is not surprising given the mileage and towing use. Does this affect your choice of oil in any way?

This may be a bit of a dum question, but is there anything that can be done to "tighten up" a worn differential?

 

[Johnny]

Either a 75W-90 synthetic or a 80W-90 conventional gear oil. The rear differential should hold 4.1 pints.

 

[MrHorspwer]

At 200K miles, don't forget to take a look and see if the axle seals are leaking. Doing a diff service is the perfect time to also do the seals.

 

[thomassanders]

Have you tried changing some (removed non site sponsor link) in order to make things right for your Chevy Astro? I don't know if this would help you out, but try to search into other options in order to see the Oil Differential in all aspects of your van.