I have a 1993 factory service book . From this book , section 12-2 it list the front axle bolt torque value 90 N-m (9.0 kg-m or 65 ft-lbs ) . Again this is from a 93 service book . To my knowledge the forks are the same on all yrs of 1500 .
More info from section 15-9 , After you torque the axle bolt :"Measure the clearence between each surface of the left brake disc and the the left brake caliper braket with a 0.70mm (0.028 in ) feeler gauge .
If the feeler gauge cannot be inserted easily , loosen the front axle pinch bolts and move the left fork slider out until the gauge can be inserted . Then retighten the left axle pinch bolts . "