I realize that, but they're used, and I'd just as soon go with new.
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I put them on my M715, and it is a huge difference. You're not turning all that steel on the front end daily driving.
Scott
Only problem I've had with the Selectros was the spring digging into the cap on one of them. When I moved it to the unlock position it was like winding it up and it would slowly "unwind" as I was driving and partially engage itself.
The sound of the splines not quite engaging and rubbing together is quite disconcerting...
Tried flipping the spring around and it dug into the other side, same thing. I filed the end of the spring smooth and no problems since.
My M715 had them on it when I bought it and never really noticed the difference until I got the M725 which does not have a set. The biggest thing I noticed was how much easier the truck turned in tight spaces compared to the one without hubs. You can really feel all that stuff trying to turn over in a tight turn compared to the open hubs.