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Old 11-09-2011, 11:02 PM   #51
fixit-p
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Re: Driveline Vibration

If your measurements are accurate.

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trans- down 2*, front shaft down 3*, back shaft 0*, pinion up 4*.
Then the operating angle of the first U-Joint is good @ 1* the pinion should be parallel with the first drive-line (3* up) which would make the operating angles of U-Joints 2 & 3 equal at 3*. Alternately you can lower the first drive line down to 4* which would cancel out the pinion angle but make the operating angle of U-Joint # 1 @ 2* and U-Joints 3 & 4 @ 4*. At 4* operating angle you can start to see the life of the U-Joint be compromised but you shouldn't see any vibration because of pinion angle.

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Old 11-10-2011, 11:00 AM   #52
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Re: Driveline Vibration

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Originally Posted by Street Smart View Post
^^^^^^^^^^^^^ great pic! and info.
Its hard to get an accurate place to measure the trans angle, nothing looks parallel to the output shaft. So i figured where the bellhousing mounts to the block should be perpendicular, safe to assume?
Use the crankshaft pulley for the trans angle. it is the most accurate.
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Old 11-10-2011, 02:18 PM   #53
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Re: Driveline Vibration

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Originally Posted by Dunenutt View Post
Use the crankshaft pulley for the trans angle. it is the most accurate.
That would be good but i have a mechanical fan and shroud, kinda hard to get in there.
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Old 05-04-2012, 08:48 PM   #54
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Re: Driveline Vibration

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Originally Posted by Street Smart View Post
That would be good but i have a mechanical fan and shroud, kinda hard to get in there.
Any updates on this subject - My truck is static dropped 5 1/2'' front and 7'' rear and I have a vibration around 60 -70 mph ?
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Old 05-04-2012, 10:05 PM   #55
Street Smart
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Re: Driveline Vibration

I still have the vibration in my Suburban. I tried different angle shims at the rear, didn`t help. My next move is to either cut the floor and raise the back of the tranny, or getting a driveshaft made with a C.V. joint to eliminate one of the angles.
Keep me posted if you figure something out.
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Old 05-05-2012, 11:37 AM   #56
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Re: Driveline Vibration

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Originally Posted by Street Smart View Post
I still have the vibration in my Suburban. I tried different angle shims at the rear, didn`t help. My next move is to either cut the floor and raise the back of the tranny, or getting a driveshaft made with a C.V. joint to eliminate one of the angles.
Keep me posted if you figure something out.
Hmm... Man this can be a hard thing to figure out . I'm getting ready to go on the HRPT so I have until June to play with diff angle's . I'll report my findings here . Thanks for the reply man
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