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My 67 Firebird has multi leaf springs and a 12-bolt posi. Obviously not stock.

The rear suspension squeeks when I hit a bump. I don't know the spring rate, but I believe they are stiff. The previous owner had the car set up for drag racing.

Anyway, how do I lube the springs? Pack with grease and wrap with plastic for a few weeks? Spray grease?

Thanks
 

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Along with Don's suggestions, you can 'pry open' the leaves a bit and on the leaf ends, spray in some white grease.

You can also spray the shackle bushings, you might even loosen them up to allow better penetration between the shackle and bushing.
 

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If they are OE rubber, don't lube.. tighten.. You may need to remove and clean however.
Rubber is not supposed to slip back and forth in the spring eye as the suspension travels, which is why it's instructed to torque the suspension at ride height.
The squeaking is very likely the bushes gripping, slipping, gripping, slipping etc..
 

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You have some good suggestions here. I like to put the Mylar in between the springs if I have them out and apart doing bushings, center bolts, paint etc.
 
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