I have began to notice, upon acceleration, significant movement in the transfer case shift lever. Back many years ago when I was young and agile enough to crawl around underneath vehicles, that movement in any transmission lever, accelarator peddle, etc... could be a significant diagnostic for a loose or worn out motor mount. Is this a common problem for this year and make? I have a little over 113K miles on the truck and it is a 5.4. Is there a way to confirm whether or not it's a mount issue short of taking to a dealer?

Have you tried opening the hood and have someone rev the engine while you look for any movement?

Thanks for the response. Yes I have but not much movement at least not like the shift lever. maybe a transfer case mount?

Ask over on this forum.

http://www.f150online.com/forums/index.php

I'm a member over there (Stealth) and they have a wealth of information on F150's.

Very informational site here!

I have an 03 and thought I was having an issue like that. When accelerating from 35-40 ish it felt like it was slipping.... Turned out to be a bad COP (coil over plug).

A much easier fix.