I have an external hub D44 in my 78 K5.
I have Warn Premium lock outs on it.
But my t-case is a 205 which is a part time case.
I believe to run the lock outs you will also have to convert the t-case to part time.
To change to lock outs just remove the plate and the slug and install the hubs. I believe that the external hubs are about $120.
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78 K5 on 3/4 ton axles.
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69 K5, .060 over 350/465/205.
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