Author Topic: 12 bolt backing plates  (Read 2580 times)

MyRed67

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Re: 12 bolt backing plates
« Reply #15 on: November 29, 2012, 06:55:40 AM »
 I have a '69 12 Bolt Posi under my car, (I changed the Perches to Mono)and it has the shields.  They were spot welded on from the factory.  Looks exactly like Chicks pic. above.
1967 Camaro  LOS  11A
Original Engine   Z - Tribute
Mike C.    NW - Illinois

BlackoutSteve

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Re: 12 bolt backing plates
« Reply #16 on: November 29, 2012, 09:02:55 AM »
   10-bolt plates will work, but you may have to grind the center axle bearing holes oversize a tad. I have a new Moser 12-bolt under my car and I used the backing plates from an old 10-bolt. I don't know of the Moser axle bearings are bigger than standard GM or not because I used C-clip eliminators. But the holes only need to be enlarged slightly. I used a carbide bit in a grinder and it's a snap. Hope this helps.



Thanks guys..
Pretty sure 10 and 12 bolt axles use the same wheel bearings and backing plates, but Moser are making 12 bolts and strongly suggesting they supply them using big Ford Torino press-on bearings and retainer plates.. Thay are a far better and safer way of retaining the axles as opposed to C-Clips, and C-Clip eliminators are still a no-no for the street. http://www.moserengineering.com/moser/faq/
Anyway, the Torino bearings are 3.150" OD as opposed to tiny 12 Bolt 2.255" OD so the backing plates need to be opened up to ~3.200" so the bearing will pass through when installing. Much easier and neater done on a lathe if you have access to one, which is what I had done.
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840

BlackoutSteve

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Re: 12 bolt backing plates
« Reply #17 on: November 29, 2012, 09:03:48 AM »
PS. I found out that Camaro rear drum wheel cylinders have a 7/8" bore.
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840