Truck has been vibrating under throttle. HELP

[lcducote]

i don't know if its coincidence but after i put a new rear main seal in i noticed vibration while driving. starts between 40 and 50 mph once im past that it quits. sometimes vibrates in coming out a stop and turning. since there is no vibe when im parked and just revving it i feel like its safe to rule out any motor problems but i could be wrong.

in search of the problem i ended up putting in warn hubs because i thought that was it.. not the case, still get the vibe.

all new u joints and carrier bearing, still vibes.

i am stumped... some other possibilities i have considered are the flex plate being warped or a spring being broken, but the trans is fairly new. also i noticed a plastic ring on the back side of the hub is just dangling on the axle... wtf

i tried to be very specific as to what is happening. please help if you can!

[Hank]

Originally Posted by lcducote

i don't know if its coincidence but after i put a new rear main seal in i noticed vibration while driving. starts between 40 and 50 mph once im past that it quits. sometimes vibrates in coming out a stop and turning. since there is no vibe when im parked and just revving it i feel like its safe to rule out any motor problems but i could be wrong.

in search of the problem i ended up putting in warn hubs because i thought that was it.. not the case, still get the vibe.

all new u joints and carrier bearing, still vibes.

i am stumped... some other possibilities i have considered are the flex plate being warped or a spring being broken, but the trans is fairly new. also i noticed a plastic ring on the back side of the hub is just dangling on the axle... wtf

i tried to be very specific as to what is happening. please help if you can!

The dangling seal is common. Mine are that way too. There is a new design that is supposed to be better but they will have to wait until there is another reason to take the front end apart.

Vibs: I was going to suggest everything you have already done. You didn't leave a shim out of the carrier bearing support did you?

[melmount]

dont rule out the motor, the tc locks up around 38 mph. Thats when a shake would be felt if its the motor.

[highraven99]

also check the front wheel bearings, inner and outer. see if u can lift the axle shaft on each side in the front. if you can move it alot the inner bearings are out on that side

[lcducote]

i had a shop do the carrier bearing so i don't know about the shim. what do i need to do to check?

i have considered the tc... the vibe is always under throttle, once i let of the gas it dies out slowly and is gone???

[Hank]

Originally Posted by lcducote

i had a shop do the carrier bearing so i don't know about the shim. what do i need to do to check?

i have considered the tc... the vibe is always under throttle, once i let of the gas it dies out slowly and is gone???

It doesn't appear you truck is lifted. If so you wouls expect to see 1/4" +/- of shim for every inch of lift. If no lift then this is probably not your problem. I would look at the bolts and see if the nuts are in the same relationship as before. No "new" bolt threads exposed.

[lcducote]

HANK

leveled in the front and converted rear springs to one ton, but the vibe was there before i did that.

can you be clearer on what you mean by the bolt thing????

[lcducote]

could it be an injector not working properly?

[zpd307]

you got me stumped..... you done everything i would have suggested also.

[lcducote]

anything about it being the injector?