Long sitting/no usage, rear axle

I have an axle of unknown quality.

It came from a 1976 Plymouth Volare Road Runner E58 car. This car was driven hard and abused. The axle is an 8 1/4 with a Sure Grip Unit. 2.94 gears. It is going into the Dodge Aspen that I am restoring. The trans will be a cast iron 833 Over drive unit and the motor will be a 360 with a XE274 cam.

I took off the backing plates, pulled the axles and gave the axle a once over look.

The gear oil inside the differential looked great despite the fact that the vent plug/hose was not installed. Just an open hole that was caked over/covered in an oil-mud brick mixture.

I am refilling the gear oil with synthetic Sure Grip gear oil.

Is there any concern regarding the clutches on the sure grip with regards to some sort of preventative maintenance?

Any recommendations?

Thank you very much!