weird noise, shaking

[REDPOWERSMOKER]

ok i was going down the road today and when im in full throttle there is a terrible shudder (thought it was a tire till i got out the throttle and it stopped) and when i get out of the throttle and coast i hear a really weird squeek noise till i depress the clutch then the shaking and squeek are gone...

truck is a early 99 7.3
new trans 2k miles
new pilot bearing 2k miles
new con fe clutch and throwout bearing 10k miles

other than a boost fooler i am bone stock

[REDPOWERSMOKER]

ok ujoints are great but the drive shaft in the carrier bearing moves up and down about 3/4" up and down and side to side i believe i just located my problem what do you guys think

[JakeLewis79]

the driveshaft is turning whenever you're rolling, so it should still be doing it even if there isn't a load on the engine. But it would probably be less noticeable. Let us know how it goes.

[mbahr22250]

I had a carrier bearing go out on my last truck. It shook so bad I thought a wheel was coming off. Plus it made a terrible noise, not really a squeek, more of a growl. The bearing will move a little in the rubber isolator though so make sure that isn't it, but it sounds like it's probably bad.