From Camaros.org: Mono-leaf and Multi-leaf Spring Usage
All 6-cylinder cars for all 3 years came with monoleaf springs (see the brake system information below for the possible -- but very unlikely -- 1969 JL8 4-wheel disc brake exception). All 1967 models used monoleaf design rear springs.
For 1968, only models with the 12-bolt rear end received multi-leaf springs. This included all SS models, the Z28, and the L30/M20 327/275hp 4-speed. All other 1968 models used monoleaf springs.
In 1969, all models with 12-bolt axles received multi-leaf springs and all models with 350ci engines (10- or 12-bolt) received multi-leaf springs. Vehicles with 307 and 327 engines received mono-leaf springs.
All 68-69 Z28's used 4-leaf springs. Generally, the other multi-leaf spring applications used 5-leaf springs. However, the use of 4-leaf springs was not limited to just 68-69 Z28's. Spring selection was a function of weight and options - and this was fine-tuned in 1969. SS, LM1, L65, and COPO cars with 4-leaf springs are possible according to factory documentation and they have been observed on original SS, LM1, and L65 cars.
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