MackR797-W45Holmes Posted July 23, 2006 Share Posted July 23, 2006 I have a clunk type noise ocassionally maybe once or twice per mile not consitent could this be coming from the power divider section ? does mismatched tyres cause this ? Quote Link to comment Share on other sites More sharing options...
Superdog Posted July 23, 2006 Share Posted July 23, 2006 Tires could be the problem,do you have an OD transmission? Quote Link to comment Share on other sites More sharing options...
HK Trucking Posted July 23, 2006 Share Posted July 23, 2006 I have a clunk type noise ocassionally maybe once or twice per mile not consitent could this be coming from the power divider section ? does mismatched tyres cause this ?I've had that happen a few times. Usually it's a combination of two things.1) The plungers & cams in the power divider are getting worn.2) Mismatched tires from front to back on the tandems.The clunking is the result of the pins & cams "jumping over" 1 notch every so often trying to compensate for tires of slightly different diameters on the drives.Measure the circumference of each of the 8 drive tires. Put the 4 largest ones on the right side, & put the 4 smallest ones on the left side.With a Mack power divider NEVER put all 4 larger tires on one drive axle & all 4 smaller tires on the other drive axle, as this causes the power divider to work constantly to compensate."Brand X" trucks with a conventional inter axle differential are not sensitive to mismatched tire as they are a regular spider gear type setup.If you match up all the tires as I stated previously & it still clunks, then it's time for a power divider rebuild. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment Share on other sites More sharing options...
MackR797-W45Holmes Posted July 25, 2006 Author Share Posted July 25, 2006 I've had that happen a few times. Usually it's a combination of two things.1) The plungers & cams in the power divider are getting worn.2) Mismatched tires from front to back on the tandems.The clunking is the result of the pins & cams "jumping over" 1 notch every so often trying to compensate for tires of slightly different diameters on the drives.Measure the circumference of each of the 8 drive tires. Put the 4 largest ones on the right side, & put the 4 smallest ones on the left side.With a Mack power divider NEVER put all 4 larger tires on one drive axle & all 4 smaller tires on the other drive axle, as this causes the power divider to work constantly to compensate."Brand X" trucks with a conventional inter axle differential are not sensitive to mismatched tire as they are a regular spider gear type setup.If you match up all the tires as I stated previously & it still clunks, then it's time for a power divider rebuild.superdog, no o/d , 12speed direct air shift.Tires could be the problem,do you have an OD transmission?no overdrive. 12speed direct air shift. Quote Link to comment Share on other sites More sharing options...
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