cowboy94

Ok so I replaced both my ujoints but my truck still vibrates between 30-55 mph (it's a 95 f150 inline 6) and can't find or determine why it shakes it only does it when I'm barley in the throttle if I floor it it won't shake

LobstahClaw

Maybe the driveshaft is a little out of true ?

Might be the output shaft bearing on the transmission ?

Maybe the bearing on the imput side of the rear end ?

Seems like if it were a bearing there might be a little up and down play when you wiggled it but it's just a guess.

cowboy94

Theres absolutely no play in the driveshaft and thers no tweak in the shaft that was the first thing I checked for

chiefcarp

I would say some of the needle bearings got laid down during assembly.
Not accusing you of anything and not assuming you are new at this but I have done it myself more times then I want to talk about.

Scott'sF150

5 spd. or auto?
Also, you didn't say if you inspected the crossmember mount.
If it's worn or loose, that could cause vibration under a light load, but torque twist would keep it from moving under WOT.

cowboy94

It's an automatic and the cross member mount is on my list I just replaced my motor mounts and made sure the motor was level, there's no play in the driveshaft I know it's in the transmission because if overdrive is on it will shake but if you turn overdrive off it won't do it at all

dirtcrew51m

Check the carrier bearing if you have one, if the rubber is worn it will cause a vibtation. And if it is in the trans possibly the torque converter going bad.

cowboy94

I'm new to doing transmission work I've mainly done motor work so where is the carrier bearing located and what do I need to specifically check for

cowboy94

I just researched it an I don't have a carrier bearing so any other suggestions on why it only shakes when overdrive is on?

dirtcrew51m

The vibration could be caused by the torque converter trying to lock up or slipping. Carrier bearing is on a 2 piece drive shaft.