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Gear Oil, Additive and Break-In

Use a gasket or 100% silicone to seal the cover or third member to the housing. Use only high quality name brand gear oil and fill the differential until the oil spills out the plug hole. Positraction carriers require anti-friction additive.

All new gear sets require a break-in period to prevent damage from overheating. After driving the first 15 or 20 miles you must let the differential cool for 30-40 minutes before proceeding. Drive 500 easy miles before towing. Tow for very short distances (less than 15 miles) and let the differential cool before continuing during the first 45 towing miles. Change the gear oil after the first 500 miles. This will remove any metal particles or phosphorus coating that has come from the new gear set.

ANY OVERLOADING OR OVERHEATING CAN CAUSE THE GEAR OIL TO BREAKDOWN AND THE RING & PINION CAN FAIL.


From West Coast Differentials:

http://www.differentials.com/install.html
 

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And if it's a race car, the drive to the water box will do it. Then you're ready to go. LOL. Dave
 

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65 Post said:
And if it's a race car, the drive to the water box will do it. Then you're ready to go. LOL. Dave
Ha!

I did a 411 set for a friend's 70 one time. The twenty feet of backing up out of the shop did it. He spun through three gears and disappeared down the road. Still working fine though....
 
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