Prothane bushing install for rear z06 leaf spring
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Joined: Aug 2017
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From: Tallahassee FL
Prothane bushing install for rear z06 leaf spring
Hey guys I'm installing a set of prothane bushings with a rear z06 transverse spring in the 99 frc at the moment. I noticed they are a different thickness than the stock rubber bushing which leads me to my question. For re installation do I have to set the adjuster bolt a different amount of turns to obtain the same ride height? Or do I put it back the same way I took it off? Thanks
Matthew
Matthew
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From: Tallahassee FL
The factory manual says to measure the bolt length on the adjuster bolt to set height back to stock level. I measured the bold height but am not sure if it should change to compensate for the different bushing height. I would like to get the ride height as close to where it was as possible on the first try.
Team Owner
Joined: May 2001
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From: Western NY
The factory manual says to measure the bolt length on the adjuster bolt to set height back to stock level. I measured the bold height but am not sure if it should change to compensate for the different bushing height. I would like to get the ride height as close to where it was as possible on the first try.
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From: Tallahassee FL
That would have been smart to measure the difference in bushing size and a- arm to ground distance but I went ahead and installed them and set the adjuster bolt length back to the initial measurement. Oddly enough, the car seems to have gained more height in the front relative to the back but possibly some in the back as well. If the suspension does not settle down further I will probably adjust both front and rear transverse spring bolts to try to cut off some of the gained height. All together, I installed C6 z06 shocks, C6 z51 sways, and a rear C5 z06 transverse spring. Has anyone had any similar experience with a gain in ride height?
Team Owner
Joined: May 2001
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From: Western NY
At least in the rear, the ride height you wind up with, is strictly determined by how you set the adjuster bolts. Since you have to remove them, then re-install them, when you replace the spring, the ride height you get is fully dependent on how much tension you put on the spring, which is what those bolts do. What you need to do is concentrate more on the "a-arm pivot bolt to the ground" measurement, than number of turns on the nut, or number of threads showing on the bolt. The factory shop manual uses the "bolt to the ground" as a point of measurement.
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Joined: Aug 2017
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From: Tallahassee FL
How do I take that measurement with the car on jack stands? Also with what tool would you measure that accurately? If I could I would measure the z height like the manual states. But that requires an alignment rack and $$ tools unfortunately.
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Team Owner
Joined: May 2001
Posts: 87,357
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From: Western NY
After the spring is installed in the car, all you need is two wrenches and a tape measure, to make adjustments..