Pinion angle
12-10-2008, 05:54 AM
#11
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I have 2'' drop shackles and Ive removed the overload spring for a total of 3 to maybe 4'' of drop would the 3* or 4* degree shims be the right size to get. Sorry for all the questions.
It eliminated a low end, high torque studder I felt... Maybe the pinion deflecting a bit under load???
12-10-2008, 07:01 AM
#13
Good luck with it Bryan. I literally spent weeks working on mine. 3 different shim angles. Measuring, changing... etc. I could move vibrations around in the RPM range and kind of improve them, but never got rid of all of them. The biggest improvements came when I shimmed the rear end of the tranny up.
12-10-2008, 08:13 AM
#14
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We can't tell you what size shim to run, basically how it works is your trans is pointing downward at 2-3* so you want you rearend yolk to point up at 2-3* so they are opposing angles. What you can do is put an angle finder and check the currenty angle AT RIDE HEIGHT, then adjust from there. They are suppose to oppose each other to allow the u joints to use their full range of motion. Otherwise you can experience vibration and u joints will eventually freeze up since they don't constantly use the full range.
12-10-2008, 09:17 AM
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I had to do this a few months ago. I put the truck on ramps,so the truck was level. You can even used jackstands, just make surethe rear axle is loaded (jackstands under the axle). Then measure the trans angle, front u joint angle, rear u joint angle, and diff. angle. If you have a 2 piece driveshaft, I'm not sure what to do. From those measurements, you'll want to find the working angles, its hard to describe from text, but there are a lot of places on the net that are helpful. Then from working angles, you can decide what shim to use. I have a 7" drop, flip kit, and used a 6* shim. I wanted the pinion down a little. In your case I'd guess a 2* or 4* should do it, but you still have to measure to fix it. You could buy both and do it by trial and error. Hopethis helps.
12-10-2008, 11:09 AM
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I really only have a slight vibration but dont wont any problems down the road is broken u joints the only thing that goes bad or is there other issues?
Last edited by Breeze; 12-10-2008 at 12:24 PM.
