) that bolts on to the top of the rear shock and then bolts onto/into the frame with two 13mm bolts.
There are no bolts you access by removing the carpet. You remove the two bolts that secure the mounting plate to the frame via the wheel well.
Feb 20, 2015, 06:39 PM
Last edit by: IB Advertising
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How Do You Replace C4 Shocks
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Racer
Joined: Jun 2004
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From: Macomb MI
How Do You Replace C4 Shocks
Does anyone have a link to how to replace the shocks on a 91 Coupe? I have checked the tech section without finding what I am looking for. Appreciate any help.
Safety Car
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Race Director
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Instructor
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Team Owner
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The later C4's had a separate upper mounting bracket that attached to the shock. Those shocks attached to the bracket similar to the way the front shocks are attatched on the upper part. The bracket then was inserted into a hole on the underside of the frame rail and bolted in with two small bolts.
The front shocks are pretty straight forward, a nut on top of the shock rod for the upper end and two bolts that hold the lower end of the shock to the lower control arm. You don't even need to raise the front of the car to replace the front shocks. The nuts on the lower bolts are easily accessible with a long socket and the nut on the shock rod can be removed with a box-end wrench.
Melting Slicks
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It's not hard to do. However, one thing to be aware of, which I just encountered, is that the upper half of the top bushing (that sits up inside the frame rail, can be swollen. On mine I really had to struggle to get it out of the hole in the frame. Torque on all bolts and top studs is 20 ft lbs. The big nut on the lower rear is torqued to 60 ft lbs.
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Plan on doing very little wrenching and a lot of drinking. Start an hour before superbowl and still not miss kickoff.
Team Owner
Joined: Dec 1999
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
It's not hard to do. However, one thing to be aware of, which I just encountered, is that the upper half of the top bushing (that sits up inside the frame rail, can be swollen. On mine I really had to struggle to get it out of the hole in the frame. Torque on all bolts and top studs is 20 ft lbs. The big nut on the lower rear is torqued to 60 ft lbs.
Melting Slicks
Joined: Dec 2009
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From: Westmont Il.
Shock replacement is pretty straightforward, right, but here's a small dilemma. In general the top nut should be tightened to expand the bushing out to the dia. of the washer. The previous post said 20 ft. lbs. on the nut. Replacement washers are a harder urethane than the stock rubber ones so maybe 20 ft.lbs. isn't enough to properly expand the bushing. Comment? One other point, the stock bushings have a nice male female arrangement to them to keep them centered on the stud. Replacements will probably be the generic donut type. If the stockers are in perfect condition, as mine were, can or should they be reused?
Melting Slicks
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From: Delta B.C. Canada
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Yup. You unbolt the plate and then pull the shock assembly out of the hole in the frame. If the bushings are swollen, you may need to use some persuasion.