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Setting the "D" height

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Old Jun 29, 2025 | 09:27 AM
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Default Setting the "D" height

TheSkunkWorks helped me a lot. In a rush to get a change made to go to a Time Trail at NJMS, I went from the Daytona suspension to the F-41 suspension. I changed the front and rear spring and noticed the ride height was different especially in the rear. It sat higher. While I had the car aligned, I did not address the height. The car handled as if it was possessed.

If you make a change in the car a you notice a change in the height, you may want to consider checking your “D” height. I adjusted mine and went more to a racing spec and the car handled much better. I think street “D” height is 1.6 inches and racing is around 1.2.

https://www.corvetteforum.com/forums...-response.html

http://www.corvettefaq.com/c3/ChevyPower.pdf

If you look at figure 11 on page 10, you will see the “D” height. You may need longer bolts which isn't an issue. I purchased 10" bolts, set the height and dremeled off the excess.
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Old Jun 29, 2025 | 03:48 PM
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Originally Posted by cottoneg
TheSkunkWorks helped me a lot. In a rush to get a change made to go to a Time Trail at NJMS, I went from the Daytona suspension to the F-41 suspension. I changed the front and rear spring and noticed the ride height was different especially in the rear. It sat higher. While I had the car aligned, I did not address the height. The car handled as if it was possessed.

If you make a change in the car a you notice a change in the height, you may want to consider checking your “D” height. I adjusted mine and went more to a racing spec and the car handled much better. I think street “D” height is 1.6 inches and racing is around 1.2.

https://www.corvetteforum.com/forums...-response.html

http://www.corvettefaq.com/c3/ChevyPower.pdf

If you look at figure 11 on page 10, you will see the “D” height. You may need longer bolts which isn't an issue. I purchased 10" bolts, set the height and dremeled off the excess.
If you look at page 6-7 it states D height should be set to 1.25". Using a composite spring I was able to achieve that setting with 8" bolts.
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Old Jun 30, 2025 | 06:25 AM
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I was told decades ago to set D with the half shafts parallel to the ground with 1/2 tank of fuel and drivers weight in the seat.
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Old Jun 30, 2025 | 09:55 AM
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Originally Posted by 3X2
I was told decades ago to set D with the half shafts parallel to the ground with 1/2 tank of fuel and drivers weight in the seat.
The poster is setting it up for track usage. The Chevrolet Power Corvette Chassis section is all about setting up a C2/C3 for the track. The 1.25" D height is what they suggest causing the inner ends of the half shafts to be slightly higher than the outer.
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