I will be installing a new VB&P 330# rear mono spring soon and need to know the torq specs for attaching it to the diff mount. I will be useing new spring plate,spring bolts etc. Do not want the crack the diff housing by over tightening. Any help would be appreciated.

Cracking of the rear end cover was only a problem on the pre-1980 cars. The '80-'82's have a revised rear cover that is a lot stronger.
I don't have the spec's in my hand, but they should be in the instructions that came with the spring. If not, call VBP.

To help some, make sure to oil the threads of the bolts before you put them in. That helps get a much more accurate torque setting and less chance of it having problems.

I have a write up of the install at http://corvetteforum.com/techtips/viewsubtopic.php?SubTopicID=75&TopicID=3


Make sure you have the correct rear shocks to match that new spring as it has more rebound than the steel spring. The wrong shocks will make the rear end all day long.

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R those mono springs worth the weight savings,etc. enough to validate the cost?And what type of shocks are required?I was thinking leaning towards those new Edeklbrock shocks,sound pretty good.

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R those mono springs worth the weight savings,etc. enough to validate the cost?And what type of shocks are required?I was thinking leaning towards those new Edeklbrock shocks,sound pretty good. Jon M.

YES !!

They save about 40 lbs and have much better response and handling. Only side effect is a faster rebound rate that has to be compensated with better valved shocks.
You can get some specially valved KYB's from Vette Brakes. You can use an adjustable shock such as a Koni or QA1.
I am using a 9 position externally adjustable shock made by RCI and sold through Mid-America Vettes. All 4 were $199, which is a price that can't be beat for an externally adjustable shock.

Once I got them set to where I like them it has been a fantastic improvement.

|UPDATED|5/12/2003 8:17:13 PM|/UPDATED|


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You did the complete package(front&rear)?

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Thanks for the input. Got an email today from Gary,the chief tech at VB&P he said 30-35lbs.I am also putting in 460# GT front springs and 4 new Bilstein shocks.

What size tires do you have on the front of the car?
At what height do you want the front fender to sit?

I have a HUGE amount of experience in getting the front springs to have the right ride height. I worked with my VBP 460 springs for several installs to get the right stance for my car.

If you want some input on this, let me know.

At the height they come from VBP plan on your car sitting way too high.

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According to what the VBP catalog and website says the 460# GT springs in front and the 330# composite mono in the rear with the proper gas shocks will restore the vehicle to"factory" ride height. Why would it sit "way to high" and how could you adjust the front ride height with coil springs any way without cutting them and making them shorter??

phxraptor said: According to what the VBP catalog and website says the 460# GT springs in front and the 330# composite mono in the rear with the proper gas shocks will restore the vehicle to"factory" ride height. Why would it sit "way to high" and how could you adjust the front ride height with coil springs any way without cutting them and making them shorter??

Factory ride height puts your front fender at about 29 inches from the inside of the top of the fender to the ground. Go measure where you are now. Most people like it to sit around 27 or right around there. I am at 26 and that is too low for most speed bumps, but that's also because I have very low profile tires.
Yes, the only way to change them is to cut them.
Talk to "Corzvette69" over in the C3 section of Corvette Forum if you want a second opinion. He just went through the install of his front springs and had to play around to get them to the ride height he wanted as well. He also used the 460 springs.

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I have 225/70/15 Goodyear Eagles on all 4 corners.The front is sitting at 28 inches and the rear at 27 1/2.I think with the new stuff it should be about right.What ya think?

Just to add my 0.02$ Dick Guldstrand said that the composite rear spring tens to bend on hard cornering andhe would preffer using steel leafs at the back. I'm using composite on both ends and the weight savings are huge!
Back to the first question, the rate is 35lbs.

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groovyjay said: Just to add my 0.02$ Dick Guldstrand said that the composite rear spring tens to bend on hard cornering andhe would preffer using steel leafs at the back.

Only he would push a Corvette that hard anyway. For autocross I have not heard of any problems with the composites.
They used them front and rear for every C4 and I never heard of them breaking either.

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Just to throw in another 0.02$ I've seen brand spanking new composite spring snap in two piece when the car hit a speed bump. I have also read horror stories about how the composite spring start saggin after some time.
However, like I said I have them both front and rear, I'm very pleased about the quality. I've build my car to be driven hard, even Guldstrand hard and it should be able to corner well in 120mph+ too.
Why didn't I find this site beofre, this is great place!

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