ive got a set of selectro locking hubs on my f250, there shaped like a ****.

anybody ever used these? any comments, good bad ugly.

 

Those are external style locking hubs.

Why do so many prefer internal to external lockout hubs?

Many folks believe the external style lockout hubs that are mounted to the wheel hub with 8 9/16" bolts are weaker than the internal lockouts that are splined to the wheel hub. This is likely true if the bolts are allowed to loosen, but shouldn't be too much of an issue if they are kept religiously tight - which in itself can be a PITA and therefore a drawback. Other drawbacks to the external style lockouts are:

- Limited lockout and drive flange availability - both the number of options availability, and the chance of finding them in more remote regions

- The only confirmed "new" external 30 spline lockouts I could find were the Milemarker "Selectro" brand which many have reported are fairly weak

- The only 30 spline external drive flanges available are the OEM / Spicer units which would have to be sourced used or NOS.

- Converting to 35 spline stub shafts with external lockouts is more of a challenge, as there are no 35 spline external lockout hubs, and the only 35 spline external drive flanges available would be either the rare and long discontinued Spicer D70 parts, or custom made units, although I have hears that WMS and possibly Dynatrac make them also - both of whom are known for quality but also high prices.

- The external hub sticks out of the wheel hub more, and is therefore more prone to catching on rocks and getting damaged.

- Finally, because of the issues listed above, generally external style hubs are less desirable, and therefore command les re-sale value - though this could of course be an advantage too.

Taken from http://www.pirate4x4.com/tech/billav...nt/index2.html