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Difference in front suspension

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Old Jun 6, 2017 | 07:26 PM
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redsplitwindow's Avatar
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Default Difference in front suspension

Just bought a 1957 corvette.
Frame has been converted to C4 front suspension.
Reading it appears there were a difference somewhere in the years??
How do I determine what's..what?
The mounts on the frame that accept the two studs from the upper
A arm.......rear hole is lower than front.
Car came with complete C4 suspension that is still bolted together
And the holes are the same Heighth.
Does this tell me something??
Thanks
Dave
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Old Jun 6, 2017 | 08:55 PM
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They changed the spring rate between 84 and 85 but other than that I don't know that they made any other suspension changes. Others will know more and chime in.
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Old Jun 7, 2017 | 06:02 AM
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Originally Posted by redsplitwindow
Just bought a 1957 corvette.
Frame has been converted to C4 front suspension.
Reading it appears there were a difference somewhere in the years??
How do I determine what's..what?
The mounts on the frame that accept the two studs from the upper
A arm.......rear hole is lower than front.
Car came with complete C4 suspension that is still bolted together
And the holes are the same Heighth.
Does this tell me something??
Thanks
Dave
The '87 and earlier upper control arm shaft has "flats" parallel to the ground and the '88+ suspension has "flats" perpendicular to the ground.

Here's an early upper:

http://www.ebay.com/itm/1984-1987-Co...RYXByw&vxp=mtr

Here's an '88+:

http://www.ebay.com/itm/1988-1996-Co...pYehoG&vxp=mtr

Some of your posting is confusing! The C4 suspension is mounted and the chassis/car is a roller/driver? C4 stuff was delivered with purchase but not added to car? Is the chassis on the '57 an OE/GM or a custom done by maybe SRiii or another vendor.

Last edited by WVZR-1; Jun 7, 2017 at 10:40 AM.
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Old Jun 7, 2017 | 04:32 PM
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WVZR-1 gives a good easy way to identify them.

I think the intent was for a change in handling. The differences between early ('87-) and late('88+) is more than just where the flats are located. The geometry has been changed too. The changes resulted in some parts that don't interchange and the need for different offset wheels.
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