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#44965 03/14/2002 7:42 AM | Joined: Mar 2002 Posts: 3 Junior Member | | Junior Member Joined: Mar 2002 Posts: 3 | I have a 59 C60 dump with a 261, 4 speed trans, and a 2 speed rear axle. I have roar coming thru the driveline when decelarating or lugging.
There is slack in the drive shaft and I think it's coming from the pinion. I noticed what looks to be an adjustment bolt of some kind just back of the yoke on the driversside on the rearend.
I have not been able to locate any service manuals or diagrams of the rearend for reference.Any ideas?
Thanks
JUST CALL ME THAT S.O.B., THATS WHAT MY HAS CALLED ME FOR THE PAST 10 YEARS!!!!
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#44966 03/15/2002 11:48 AM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | A lot of things can contribute to driveline noise, bad rear end bearings,driveshaft support bearings, maybe a u-joint.Is it noisy in both high and low range? Its not unheard of for the differential bearings to fail. A roar during acceleration and coasting could be worn carrier bearings or a worn gear set.Have you pulled the inspection cover to check the gears for faults like pitted gears or the presence of metal in the lube oil? The picture in my repair manual doesn't seem to show a bolt as you describe on the 2 spd axle.The single speed axle has a thrust pad adjustment bolt similar to what you mention.For sure check the driveshaft support bearings and the driveshafts. You should be able to find a manual for your truck from one of the vendors listed on the Stovebolt links page. | | |
#44967 03/16/2002 4:36 AM | Joined: Dec 2001 Posts: 215 Shop Shark | | Shop Shark Joined: Dec 2001 Posts: 215 | a bent drive line could do it
Luke | | |
#44968 03/16/2002 6:28 PM | Joined: Sep 2000 Posts: 5 Member | | Member Joined: Sep 2000 Posts: 5 | The adjustment bolt you speak of is actually a "thrust" limiter. When the rear end is assembled, it's turned in until it contacts the back of the ring gear, then backed off a few thousandth's. Under extreme load, the pinion tries to push the ring gear away - laterally - causing it to deflect. With this adjuster, the deflection is limited. | | |
#44969 03/16/2002 8:33 PM | Joined: May 2001 Posts: 477 Shop Shark | | Shop Shark Joined: May 2001 Posts: 477 | how much slopis in the pinion? put trans in neutral and check the freeplay in the driveline. any more than about 1/2 inch can be adjusted out by tightening the pinion nut. leave some slop in, about 1/2 to 3/4 inch. too tight is REAL hard on the gearset.  | | |
#44970 03/17/2002 2:50 AM | Joined: Jan 2002 Posts: 19 Member | | Member Joined: Jan 2002 Posts: 19 | Barney I just found a maintenance manual for 55-59 G M C models 100-500 from Gregs Automotive he is in Cal. web sit www.gregsonline.com about $30. if I remember right. Dave H. | | |
#44971 03/17/2002 6:20 AM | Joined: Mar 2002 Posts: 3 Junior Member | | Junior Member Joined: Mar 2002 Posts: 3 | Thanks for the help! I'm goning to tear into it within the next few days, I'll let you know how it gos. 
JUST CALL ME THAT S.O.B., THATS WHAT MY HAS CALLED ME FOR THE PAST 10 YEARS!!!!
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