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Old 10-22-2002, 05:24 PM
samcuda samcuda is offline
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Default new backing plate question

the person i bought the a-body 8.75 rear with axles dug up 2 backing plates-they look right BUT-he says it has an 11 stamped on i assume i need 10 inch- i have 10 inch presently with the 7.25 HELP what does that 11 mean?
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Old 10-22-2002, 09:14 PM
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ehostler ehostler is offline
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Default

The 11 probably means that it is an 11" backing plate.

As per Auto Hobby Digest

Quote:
Flange Axle Taper and Flange Differences

Besides the obvious bolt circle lug pattern difference
between the A-body 4" BC axle and all other passenger
car 4.5" BC axles, there is a sometimes unexpected
difference in the flange that tends to cause confusion.
The distance from the axle housing flange to the wheel
flange of the axle is 1/4" smaller on A-body axles than
on the standard 4.5" passenger car axle. On an A-body
axle this measures 2", on 4.5" BC axles its 2.25".

This slight difference will cause problems when one
attempts to adapt brake systems (drum and backing
plate together), or a brake drum from a 4.5" BC axle to
a 4" BC axle. If you are using original A-body axles,
regardless of what BC is may have been redrilled for,
you can only use the original 10x1.75" drums (redrill
the drums as well).
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