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1996 Ford E150 -Trans trouble

Automatic Trans shifts rough and jerks the van almost every time it goes from 1st to 2nd, and 2nd to 3rd. scary. It even downshifts with a noticeable surge. It’s a 1996 E150. I replaced the PCV valve and hose and o-ring on the valve cover. Still rough shifting. Ideas?

Does the trans have enough fluid? Is it nice and bright red, or dark and burnt smelling? Has it ever been chagnged?

What engine and how many miles on it? Is the check engine light on?

Why do you think the pcv valve affects the transmission?