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Old 11-13-2006, 05:12 AM
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rear 4 leaf spring

Installed my 4 leaf springs on my 81 trans am yesterday along with new shocks.Now its seems to be really stiff cant even bounce the rear end.Will this soften up after a while sitting.

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Old 11-13-2006, 08:22 AM
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Some static springs do have a break in period but they should not be that far off of your final ride quality now. You may want to check to make sure you dont have your shackle or hanger eyelets over tightened. Also, if you changed shocks at the same time, they could be causeing the extra resistance too..... try sticking your old shocks back on and see what happens.
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Old 11-13-2006, 08:32 AM
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Thanks the old shocks are shot had to cut them off.By overtightening the shackles i just did them with the lower bolt with an open end wrench and tighten as tight as i could get them the upper bolts was done with an impact.Should the shackles have some movement and the bolts under the axle was done with an impact tighten so the upper and lower plates touch.Dont know the torque specs on the bolts.
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Old 11-13-2006, 08:37 AM
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I would take and loosen the axle mount bolts and the shackle bolts... put the weight of the vehicle on the axle and retighten the axle bolts. You do want to snug up the shackle bolts but it still needs to move. If you think about when your leaf spring compresses it will push the shackle backwards and vise versa on extension... If this joint is bound up it will hinder your leaf spring movement.
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Old 11-13-2006, 08:49 AM
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Thanks Tony,That makes sense.
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Old 11-15-2006, 12:57 PM
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Main eye and shackle bolts should be tight to prevent the inner sleeve from turning on the through-bolt. Any suspension movement is in the rubber/urethane, not the bushing sleeve turning on the through-bolt.

Many aftermarket springs are just too stiff. In my experience they very rarely soften up. Try the car with the shocks disconnected.

Paying more for correct springs from Eaton Detroit Spring is usually worth the difference compared to buying mexican made stuff from J.C. Whitney. Good springs will have teflon inserts between the leaves.
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