I have a 01 F350 psd and all the gears seem to function fine but second if you are sitting at a light clutch in and in second when you go to let out on the clutch the stick will pop out of gear is that just the sincros going out or what? all the other gears work fine and even when you have shifted into second it will not pop out with clutch enguaged any help would be great.

 

I hope that someone has an idea of what it is I want to get it fixe asap

 

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Sounds like an internal problem to me. These transmissions are top loaders - all shift linkages are contained inside the transmission.
Does it feel mushy when going into second compared to the other gears? Grind? Ever pop out once you have it in gear? Those symptoms are all indicative of an internal problem and the only way to fix is to remove transmission, dissassemble and repair.