1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Rear Jounce Bumpers

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Old 06-17-16, 05:44 PM
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Rear Jounce Bumpers

Here's an option to give your rear axle a softer landing. It's a GM foam jounce bumper that gives a more progressive response at full compression. Not only is it nicer on the spine, it won't upset the car as much during cornering. I haven't heard or seen evidence of any contact in the rear, and that's with running B&G lowering springs over Michigan roads.

There's a catch, however: The welded-in stud is the correct 10mm diameter, but the wrong pitch. I cut it off, drilled it out, faced off the stud head, and used the original screw that mounted the Mazda hard rubber bump stop.
Attached Thumbnails Rear Jounce Bumpers-gm-jounce-bumper-160616_2.jpg   Rear Jounce Bumpers-gm-jounce-bumper-160616_1.jpg  
Old 06-18-16, 04:00 AM
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Hey - interesting discovery! thanks for the Share-

Stu Aull
80GS
Alaska
Old 06-22-16, 11:04 AM
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That's interesting. And makes me ask: I've got an 83 GSL with 32K, all stock springs, shocks seem decent. Is it normal that when I hit a reasonable bump in the road, that the rear end of the car gives me a thunk sound and jumps as I go over it? Or is that bad springs or bad shocks?
Old 06-24-16, 11:37 PM
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I can't answer your question since I haven't driven a stock suspension car in a very long time. But you could try the mod and see if it helps. You can always switch back to the OEM bump stops if you don't like it.
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