Vibration right off idle

plumkrazee70 said

Ok... So how did that happen? It's a factory 8.75 with espo springs and things 6 leaf springs. I never changes the perches...

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I never had an issue with mine until I installed a new set of ESPO springs, moved the pinion angle almost 2* negative. I had to install a 2* shim between the spring and the perch to correct it.