Benzworld.org - Mercedes Benz Discussion Forum - View Single Post

Dai · 08-07-2003, 11:27 PM

Thanks Peter, I will not be drilling things without looking at the alternatives first. I am going to try taking the rear shaft apart and introducing 'out of phasing' to see if that has a positive impact. Its a great idea and it makes sense to try it first. My flanges are 4 degrees off in one direction. In otherwords if you jack up the truck and make the face of the transfer flange plumb or exactly 90 degrees off the floor of the shop the flange of the rear diff points slightly up toward the transfer case by 4 degrees. If I understand what the driveline folks tell me and what Dave and others have said the diff should ideally 90 degrees too or plumb as well. I was told they need to be within one degree. If not there will be a fast-slow oscillation because the u-joints are tensioning against each other as they pass through the out of parallel point. Makes sense to me. I've checked this out flat of the ground with angle finders under normal spring tension and its the same. To get correct orientation with my truck the nose of the diff needs to drop a bit. I will try to trick the driveshaft into not noticing this first. Thanks for the ideas, this is tricky to solve.

-Dai

08-07-2003, 11:27 PM	#9 (permalink)
Dai BenzWorld Extremist Date registered: Feb 2003 Vehicle: 85 300GD 83 300TD Location: Philomath OR Posts: 978	Flange parallism... Thanks Peter, I will not be drilling things without looking at the alternatives first. I am going to try taking the rear shaft apart and introducing 'out of phasing' to see if that has a positive impact. Its a great idea and it makes sense to try it first. My flanges are 4 degrees off in one direction. In otherwords if you jack up the truck and make the face of the transfer flange plumb or exactly 90 degrees off the floor of the shop the flange of the rear diff points slightly up toward the transfer case by 4 degrees. If I understand what the driveline folks tell me and what Dave and others have said the diff should ideally 90 degrees too or plumb as well. I was told they need to be within one degree. If not there will be a fast-slow oscillation because the u-joints are tensioning against each other as they pass through the out of parallel point. Makes sense to me. I've checked this out flat of the ground with angle finders under normal spring tension and its the same. To get correct orientation with my truck the nose of the diff needs to drop a bit. I will try to trick the driveshaft into not noticing this first. Thanks for the ideas, this is tricky to solve. -Dai