Leaf Spring Fatigue and Axle Tramp
Symptoms
The rear of the car sags. Under hard cornering on bumpy surfaces, the rear axle hops (tramping) -- a disconcerting and potentially dangerous loss of traction.
Cause
The leaf springs lose their temper over decades, reducing ride height and spring rate. Axle tramp is inherent to the live-axle-on-leaf-spring layout, but it is worsened by worn springs and dampers.
Fix
- 1 Replace the leaf springs -
- 2 standard or parabolic upgrade. Fit telescopic shock absorbers in place of the original lever-arm dampers (conversion kits: $150--300). The parabolic spring conversion ($400--700 per set) dramatically improves ride quality and reduces tramp
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