Posted By: mod381
ss springs -4.7 pinion angle - 05/09/11 03:30 AM
Is -4.7 pinion angle too much for a street car with super stock springs? The -4.7 is from parallels and not driveshaft. Trying to decide if i should run it or shim it so it is less. Thanks
Posted By: RapidRobert
Re: ss springs -4.7 pinion angle - 05/10/11 01:10 AM
It's 4.7 degrees down from "horizontle"? I think you want to see how much lower it it in relation to that end of the shaft. What's the shaft angle?
Posted By: mod381
Re: ss springs -4.7 pinion angle - 05/10/11 01:21 AM
Here is the specs of all,trans is down 1.1,driveshaft is down 4.5 and pinion is down 3.6. So this (i think) gives me a pinion angle of -4.7. The rear u-joint with a total of driveshaft and pinion is 8.1. I am thinking of adding a 2 degree shim to raise pinion,but I have heard that the super stock springs like more angle due to spring wrap?
Posted By: RapidRobert
Re: ss springs -4.7 pinion angle - 05/10/11 01:29 AM
How much further "down" is the pinion than the rear end of the shaft. If the shaft is 2 down and the pinion is 5 down that'd b a "neg 3 deg" pinion angle
Posted By: slantzilla
Re: ss springs -4.7 pinion angle - 05/10/11 01:45 AM
Your pinion angle is -2.5. I'd leave it alone unless you'll be putting slicks on it.
Posted By: DoctorDiff
Re: ss springs -4.7 pinion angle - 05/10/11 03:56 AM
Does your car develop a vibration on decereration or braking?
If your transmission slopes downward 1.1 degrees (toward the rear) and the pinion slopes downward 3.6 degrees (toward the front) you have a 4.7 degree negative pinion angle.
I usually consider 4 degrees maximum, but if your car does not vibrate, I wouldn't worry about it.
