Why wont my 4x4 engage on my 1986 dodge 250 power wagon?

DodgeJR

New member
my truck is a 4x4. 4 speed manual transmission and it has auto locking hubs. I've put it in 4 Hi and 4 Lo and the back tires are the only ones getting power. is there a trick to getting them to work or do i have to get new hubs?
 
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