the 4x4 wont engage . the front drive line lock but the front axles wont engage . it's on the fly no locking hubs. the is no strangew noise's when i try to shift into 4hi or 4 lo.the little lite dont come on , on the floor were you shift was servised about 2 1/2 yr ago . all cv's were replaced on axel frnt drive line back drive line boots everything so any info would be great thanx