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Message: <blockquote data-quote="Portawatch" data-source="post: 2008621" data-attributes="member: 678627"><p>I have a 6.8L V10 Ford F-250 4x4 and I've been "hot roddin" it around a bit lately and now at about 1700 RPM it starts to make a noticeable odd vibration rattling type sound and continues on until about 2000 RPM then goes away when it shifts. Also when I let off the gas it immediately shifts really hard. And when I go from R to D or D to R I can hear a loud pop. I'm assuming this is a tranny problem? It's not crucial to get fixed at the moment as far as I know, but I'm curious if anyone knows what it could be that is causing it to do this?</p></blockquote><p></p>