milo Posted December 21, 2011 Share Posted December 21, 2011 G'day, My mate and i are repairing a 12 speed box out of my '78 model r686 here in Australia.We are having trouble finding the HIandLO clutch gears new or second hand.One bloke we talked to said this assembley may have changed in later boxes?The numbers on the clutch gears as best we can see are PO 108 74KB4122 and the other PO 873 751KB 445.We are a bit green when it comes to Mack boxes,so any info anyone has would be much appreciated. Milo Quote Link to comment https://www.bigmacktrucks.com/topic/22249-12-speed-hi-lo/ Share on other sites More sharing options...
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