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Old 09-04-2015, 08:44 AM
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Corvette C4 rear in Lotus 7 style car

I am building a ‘ground up’ car based a little on a Lotus 7. I have a 1992 Corvette C4 front and rear suspension that I will be using.

I am having a little trouble figuring out measurements for relationships between the center section (pumpkin) and how far behind the ‘dog bone’ mounting the 2 mounting holes for the pumpkin should be.

The rear end is a 1992 model “36".

1. At ride height, should the axle halves be parallel to the ground?

2. When viewed from the top, should both axle halves be in the same plane? See through drawings on the internet make it look like they are slightly shifted toward the rear on the wheel end.

Andy's post from back in 2011 talks about wheel hub being 5/8" behind pumpkin out put shaft. Any concurence on that?

I would imagine that if you get the pumpkin in the proper relationship (front to rear) with the frame mounting bracket of the dog bones, the axles end up where they want to be, after adjusting for camber and toe in??

3. Is there a seam or mark on the pumpkin can you use for a center line point for side to side measurements? Is the pinion centered?

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Old 09-04-2015, 12:02 PM
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I could only make a remark, on #1, and mention that the half-shafts have to be treated as a suspension member, and as your car will likely be lighter and have a lower CG than a stock 'Vette, you might want the roll center lowered which would mean a little angle change downward toward the diff. All else, others would know more than I.
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