"I found something unusual when tearing down the rear suspension:
someone in the past replaced the stock steel-backed bronze thrust
packs with needle bearing thrust washers. They also used a "quad
ring "as a grease seal. A quad ring is like an "o ring" except the
cross section is four leaf cover-like, if that makes sense."
Russ:
When I tore down the drivers side boggies on my 73 last fall I too
found thrust bearings.
The other difference I noted was that the new pins from Cinnibar
did not use the steel plate to bridge between the two pins outside
of boggie (under lock nuts). This pIate had flats in the pin holes.
These flats engaged the pins and prevented the pins from rotating.
I can't remember how the new Cinnibar pins prevented roation but
I do remember there was some method of doing so.
I did not view it as "someone in the past replaced the stock
steel-backed bronze thrust packs with needle bearing thrust
washers" but rather as "even GM probably had different ways
of doing it from year to year" (or during the recall)
Since the thrust bearings were in excellent shape I washed them,
lubed them, and reinstalled them rather than using the thrust
washers that came with the Cinnnibar kit.
As to the "quad ring" since your description did not ring a bell I
assume mine did not have that feature.
I only have about 20 miles on my coach since the rear boggie
rebuild so it would be premature for me to comment on whether
it works or not.
Regards
Gary Zingle
1973 GMC 26 foot
someone in the past replaced the stock steel-backed bronze thrust
packs with needle bearing thrust washers. They also used a "quad
ring "as a grease seal. A quad ring is like an "o ring" except the
cross section is four leaf cover-like, if that makes sense."
Russ:
When I tore down the drivers side boggies on my 73 last fall I too
found thrust bearings.
The other difference I noted was that the new pins from Cinnibar
did not use the steel plate to bridge between the two pins outside
of boggie (under lock nuts). This pIate had flats in the pin holes.
These flats engaged the pins and prevented the pins from rotating.
I can't remember how the new Cinnibar pins prevented roation but
I do remember there was some method of doing so.
I did not view it as "someone in the past replaced the stock
steel-backed bronze thrust packs with needle bearing thrust
washers" but rather as "even GM probably had different ways
of doing it from year to year" (or during the recall)
Since the thrust bearings were in excellent shape I washed them,
lubed them, and reinstalled them rather than using the thrust
washers that came with the Cinnnibar kit.
As to the "quad ring" since your description did not ring a bell I
assume mine did not have that feature.
I only have about 20 miles on my coach since the rear boggie
rebuild so it would be premature for me to comment on whether
it works or not.
Regards
Gary Zingle
1973 GMC 26 foot
