ever since i have had my lift installed since day 1, i have had this weird thud sound and i could feel it as well whenever i would accelerate from a stop and i would never feel it unless i was accelerating from a dead stop never got it from a rolling start but lately its beeen getting worse like if im goin 30 and i the gas it would rev real high then a loud pop and then i would feel it as well i cant figure out what it is can anyone help me please

 

Mine does the same thing but it sounds like just not as bad. I gently start off on a roll from a light and then go and it doesnt do it. I heard that it was because our trucks were assembled without grease packed somewhere I forget but something to do with the drive shaft and ford wont recall it, you can to pay........

 

It's the slip joint in the driveshaft. Recalls are only for emissions or safety. This is neither of those, so there won't be a recall. Plus Ford doesn't recognize it as a problem, they consider it normal maintenance.

 

If its a rize kit, the driveshaft is too short. It slips in and out of place which is how its designed, but thats the thud you are hearing

 

ya i have the rize kit and i figured it was the driveshaft because it has fallen out before due to the fact that a miata cut me off and i had to slam and i mean slam on my breaks when he realized what he did he bolted off and i tried to chase him but no drive shaft means no go lmao....but what would i need to do to repair this issue

 

So the thud my truck does is normal? How would I maintain it?

 

Dirt_bound- Get a new a driveshaft or get yours lengthened. Thumper did this and should be able to help you.

Fireman- a slip yoke is supposed to function this way to account for rear suspension articulation. It comes in and out by design. When you lift the rear of the truck, you pull the driveshaft farther out of the transmission output shaft. If you dont have suspension mods, then its routine.

 

thankyou...do you know by chance how much that would cost

 

i think 400