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'77 J20 hub adapters


jimoshel
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Those are called drive slugs. The locking hubs allow for less fuel consumption on the highway when unlocked (at least with my 6 cyl they did) and they also allow you to put your rig in 4 lo with them unlocked for more pulling power with a trailer as a 2wd.

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I have a snow plow mounted on the truck and it never leaves the yard. I'm only interested in traction. Not fuel economy. When needed I swap the adapters between the two J20's and that gets to be a PITA so I want a adapter or a slug. I didn't know they were called that.

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