Any suggestions on rear differential oil??

[65barracudadude]

So, I have a 741 sure grip 8 3/4. I want to put new oil and such in it. Would I just use good 'ol 70-90 weight with sure grip additive for this?? Thanks in advance.

 

[mopar head]

Their was a special sure grip lubricant, I would research this before just using ordinary gear oil and additive. chrysler part#2585318:dontknow: