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I have read both the other two threads on this, and believed I knew this answer however.......my driveline project complete, new U joints and new upper/lower rubber bushings on differential front support bracket installed. Took it out for a test drive. Was pleased that the decades old vibration between 3000-3500 RPM was gone. My sense of satisfaction was short lived when I realized there were new vibrations as I went through the gears. (Oddly, I felt them in my foot, but steering wheel, not shifter, not butt.) I am pretty confident the shaft went back in with the same orientation that it came out of the yokes. Yes, the new bushings could have changed the angle slightly, but one would think that would lead to an improvement. So my thought is this. When I soaked the driveshaft, the original stripes came into view and these were to the rear when it came out.
Enter the undercoating. 1/2 of the stripes were obscured by undercoating done (probably) at Rosenthal Chevrolet. Given the position of the front differential support, it would have been extremely difficult to get undercoating on the rear part of the driveshaft while conversely, it would have been readily in the open to get undercoating on the transmission side of the driveshaft. So, I am now questioning whether the orientation of the stripes is to the rear (as I once thought) or were they closer to the front/transmission side. The two existing threads say both! Any thoughts?
John C said they were only identifying stripes for different shafts when shipped & have nothing to do with assembly.
The prop shaft came to the factory as an assembly with stripes at the rear- it only went in one way. The front part went into the transmission. Per the drawing the light side of the rear trunion was marked to coincide with a similar mark on the pinion flange.
Last edited by John BX NY; 04-13-2020 at 01:07 PM.
There's a lot of great information in those old St Louis plant photos. The chassis line didn't change much as the years went by. Many of the old parts bins, like the one on the left were still used until the end of production in the early 80's. In fact, I think I have a picture of that very same parts bin from around 1982. Notice the drapes, or curtains on the far right that made up the spray booth for final chassis blackout.
There's a lot of great information in those old St Louis plant photos. The chassis line didn't change much as the years went by. Many of the old parts bins, like the one on the left were still used until the end of production in the early 80's. In fact, I think I have a picture of that very same parts bin from around 1982. Notice the drapes, or curtains on the far right that made up the spray booth for final chassis blackout.
I know the exhaust pipes are loose at this point, but I find it interesting that they lower the motor down with pipes in place.
04-11-2020, 07:48 PM
Stripe orientation on driveshaft
