Mack dual steering box relief adjustment. Discussion in 'Trucks' started by crane operator, Apr 12, 2018. ... How do you adjust steering free play on a 1994 mack truck? The steering free play doesn't adjust.. if you have free play in your steering, you have a component worn out somewhere...Say goodbye to those very expensive piston pumps that the dealer offers with your new I-Shift or M-Drive Volvo/Mack Truck. This has the standard DIN mount flange and shaft configuration. Same specs as the standard P5151. Unit has 1 1/2″ NPT Rear Ports. Bi-Rotational. 30 GPM +
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