Originally Posted by truckernix
I am still curious where the felt ring was mounted because they are not required with the modern seal.

Servicing the New 3/4 & One-ton Chevy Truck Rear Axles
Go to page 11, also check page 10

Another name for felt ring is packing.

xfiles
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three quarter ton rear axle.jpg (77.61 KB, 65 downloads)