Well you can get the mopar chassis book, it can give more specifics on checking bump steer, and all of the angles and aligment checks, but I would think that its very critical, like +- 1/16" or less. Tim

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

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