i just started having issues with my 99 v10 f350 the engine has less than 50k so i am told it is not the original engine it has run good the only problem was the starter i had it replaced at my ford dealer on tuesday drive the truck about 75 miles sence then out of no where when i shifted from 2nd to 3rd i felt a vibration i didnt pay much atenchen because it was slick out thought "oh with all this ford power just broke free little wheel hopp" so i let it go then it did it again a few min later so then i thought maybe my clutch is slipping and then it stoped again well the same problem happened a 3rd time and hears when it gets interesting i was going about 50 with my RPM's just below 2 k i started to go up a small hill so i put my foot in it a little more and the same heavy vibration came as befor only this time it didnt stop any time i put my foot in it even a little when the R's are under 2k i get that vibration and when they are over 2k the power will come and go i was going up hill and i could feel it let off for a seccond and come back the engine sounds fine to me no odd noise it runs normal at idiel and seams ok when the engine is not under any load in 2nd grear the problem isnt there any help would be great also i know i cant spell i'm a truck driver i dont need to spell haha thanks for any help

 

Welcome to FTE v10powered5speedford! You have posted you question in the wrong forum. Maybe a moderator will be kind enough to move this thread for you to the correct forum where you will get a lot more help with your problem. By the way, here is a link to the Super and Heavy Duty forum. https://www.ford-trucks.com/forums/forum30/

Good luck!