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a buddy of mine has a 1992 s-series blazer with the 4.3, auto, 4wd. he bought a posi-lock cable and installed it the other day. the 4wd still wont engage with the cable. i couldnt turn the front driveshaft by hand when the t-case was engaged in 4wd. wondered if there was a way to tell if the shift fork or something is broken inside the differential and if there is an easy way to fix it without tearing the entire differential out.
 

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is the posi lock cable adjusted correctly. ive heard of them having problems keeping adjustment. jack up 1 front tire leave the truck in 4wd and spin the tire while your buddy pulls on the cable see if it locks up at all. if you don't get anything then pull the extension housing off the differential. it's a PITA but you should find real quick whats going on as inside there is the shift fork and gears. you don't need to take the whole axle out just that side of it.
 
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