Quote:
Originally Posted by Ramairnacho
Are the perches a different depth. I asked a friend and he said they same but read on Facebook there different. How can I tell? Is code stamping the same? My other friend measured both of his and he says it should be 2 inch. What is correct depth of perches for a pontiac formula, esprit or ta?
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There is no difference between Camaro and Firebird spring perch depth regardless of whether it's a 10 bolt or 12 bolt. Yes, there were 4 and 5 leaf spring packs, but the total thickness of both was the same. 5 leaf packs used thinner individual leafs than the thicker, stiffer 4 leaf packs.
That said, measured about a dozen 1969 to 1976 housings just now, and they are all 1 7/8" perch depth.
And as was mentioned, 12 bolt rear assemblies were manufactured by Chevrolet Gear & Axle plant. So the codes used were the same, assuming that ratio was used in Firebirds. (such as the 4.10 ratio. Optional on some 1970 Camaros, but not on Firebirds.)