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Old 06-27-2017, 07:22 PM
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Small block Swap 5 speed vibration at 25mph

I've got this small block 350 just swapped it in my 91YJ it's crazy fast . Problem is I'm getting a bad vibration at 25-30mph then it dies off a little but is still noticeable
When I coast it goes away
I want to blame my rear driveshaft angle but any ideas ??

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Old 06-27-2017, 07:24 PM
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This is my shaft angle now
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Old 06-27-2017, 08:12 PM   #3
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How old are your u-joints?
How much spline engagement do you have? DS to TC
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Old 06-27-2017, 08:42 PM   #4
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Old 06-28-2017, 08:55 PM   #5
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If it does not have a SYE, then it look off to me. A pic from the side would be better, or just check the angles yourself, without a SYE, I think you should be 2degs. low at the pinyon end.
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Old 06-30-2017, 01:12 PM   #6
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its hard to see in the picture but it looks like you do not have a double cardan shaft.
And if not your t-case and rear axle yolks should be parallel.

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