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Old 02-22-2006, 10:16 PM
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Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Backing plates
Are there any differences in the bolt patterns for the backing plates between a 10 bolt with PBR's and a 9 bolt with the old style calipers?
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Old 02-22-2006, 10:23 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Yes, the flanges are different on the 10 bolt and 9 bolt.
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Old 03-11-2006, 07:44 PM
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Car: 1991 BandittII Firebird
Engine: 5.7 HSR
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
yes they are a different bolt pattern but they can be made to work

10 bolt backing plate to a 9 bolt backing plate
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Old 03-12-2006, 06:12 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Contact Ed Miller. He can set you up with the correct plate, no modification required.

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