a '90 1/2 ton will have the AAM 8.25" IFS differential.. I don't
think there is a kit made to convert it to manual hubs... (not the 4x4
posi-lok cable actuator). I'd just get the 98+ actuator and adapter
harness from GM and forget about it. I put it in '88 K2500 a few
years ago and it's worked flawlessly ever since.
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