Advice/Clarification on Control Arm Bushings Please!

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Advice/Clarification on Control Arm Bushings Please!

Postby Jitterbugdude » Wed Feb 24, 2021 4:22 pm

Can someone clear a few things up for me in reference to rear control arm bushings ( 1972 Vega Wagon).
My GM Parts manual says I need the following control arm bushings for the rear:
3978060 (quantity of 4)
3997973 ( quantity of 2)
3988064 ( quantity of 2)

There is a guy on ebay selling a complete set of 8 bushings (cheap compared to NOS). When I asked him if they are marked as to upper rear, lower etc he said no.... they are all the same size.
So... What's going on? I find it hard to believe that GM would call out 3 different part numbers if the parts were indeed exactly identical to one another.

Are the differences so small that basically 1 size fits all?
I'm looking for GM NOS by the way, no polyurethane please!

Any insight/help/comments appreciated
Randy B
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Re: Advice/Clarification on Control Arm Bushings Please!

Postby cjbiagi » Wed Feb 24, 2021 6:13 pm

They are not all the same. I am not sure about the upper arms but the bushings in the lower arms use a different one front and rear. It sounds like the bushings he is selling are for other GM cars that use all the same size upper and lower.
Clyde.........75 Monza 2+2
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Re: Advice/Clarification on Control Arm Bushings Please!

Postby Jitterbugdude » Thu Feb 25, 2021 6:56 am

Thanks Clyde, I thought they guy was wrong but just wanted to verify.
Randy
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Re: Advice/Clarification on Control Arm Bushings Please!

Postby monzaaddict » Wed Mar 03, 2021 2:19 pm

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Re: Advice/Clarification on Control Arm Bushings Please!

Postby monzaaddict » Wed Mar 03, 2021 2:20 pm

3997973 is lower front
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Re: Advice/Clarification on Control Arm Bushings Please!

Postby cjbiagi » Wed Mar 03, 2021 9:20 pm

3997973 is the rear bushing for the upper rear control arm according to parts manual shown. Sometime the bushings are different on each end of the arm.
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