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Old 07-05-2004, 03:12 PM
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Too much down pinion angle,what did i do wrong?

I just finished (well i thought) installing a small bearing 28 spline Ford 9" in my 68 Camaro w/long tail TH350 trans.I have a big problem my pinion angle is at 12 degrees down which as you know is causing vibration and all kinds of noises at the u joint.I welded the perches on myself (1st. rookie mistake)I leveled my weld on universal Moroso perches and put 6 degrees down on my housing at the gasket area with a straight edge and angle finder,and now with car completed and down off of jacks, the rearend sits unlevel 6 degrees plus my 6 degrees i put in when i welded the perches for a toal of 12 degrees.I dont think i can use enough pinion wedges to get it right so i went today and got another pair of perches and am planning on redoing it,but how do i do it right this time? Please Help!!!
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Old 07-05-2004, 05:25 PM
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When you have the current perches cut off the rear end and are ready to weld the new perches on bolt the rear end on the springs with the perches in place but don't tighten the bolts. Support the axle at the spring with jack stands (do not support the axle you will need to rotate the axle only support the spring.) Make sure the weight of the car is on the springs (sitting on jack stands) and then use a floor jack to change the pinion angle to match the angle of the rear of the transmission. If the trans is pointing down 3 degrees then the pinion needs to point up 3 degrees. etc. When you have the angle correct then tack the perches in place. Then remove the axle and finish weld the perches and reinstall. That's it.

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Old 07-05-2004, 05:57 PM
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So i have to get weight of car on suspension bolt up driveshaft to 3rd. member rotate housing untill i have degrees on driveshaft and vertical degrees on yoke (on 3rd. member)add them together for a total of somewere around 6 degrees down?This done with an angle finder.Is this correct?
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Old 07-06-2004, 06:19 AM
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NO. Do not install the driveshaft. When you have the rear temporarily installed measure the transmission output shaft angle with an angle finder (Sears sells them for about $15). It will give you the relative angle of the transmission. Then use a floor jack to rotate the pinion angle to match the angle of the transmission in reverse. Once again, if the transmission output shaft measures 3 degrees down relative to level then the pinion shaft should measure 3 degrees up.

Check out this link Inland Empire Driveline. It will show you what I'm describing.

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Old 07-06-2004, 02:22 PM
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What would have been easier is to have made up a steel JIG of the old rearend and the setup of where the perches are, then you set everything in there, and weld it all back on. ORRRRR if you wanted to make a change to the pinion angle, make your change on the jig.

If you are wondering how to make a jig, ask me how, I will draw up a picture to show you how to do it.
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Old 07-08-2004, 03:11 PM
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Thanks guys i hope to have it back in sometimes next week,I also have 2 more problems with my 3rd. member 1st. after only going 1 mile i have alot of metal filings in the bottom of gear oil it could have not came from the housing since i steam cleaned it myself,also the pinion seal is leaking at the nut.What a PITA this has been!!
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