Do you have coils or leaf springs in the rear? SR will be coils, and if yours is same, should bolt up. Test the pump/regulator and actuator with a 12v battery (or 2 9v's in series). Should run, then stop, and the axle should lock up before it stops. Kill power and air should vent and axle should unlock. I think pump is in one of the cubbies under the rear seats, but somebody will chime in and let you know. SR locker will be 4.636 ratio, which should be fine if you have a 4.625 in yours (tag in engine compartment will have ratio without decimal). Some diesels are 4.875, and while there is a 4.9 for the big diff, I've never found one.
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