Starting to get a bad vibration in the seat and the floor that is really noticeable around 55-60 mph. Just had all 6 tires road force balanced yesterday and that didn't help. Which my buddy told me it wouldn't help. Hes saying ujoints. I tried moving the shaft around to see if I could see any slop anywhere but couldn't. Just did a complete brake job also. Could the drums be out of balance? How hard is it to change ujoints? Do you need special tools and presses? Carrier bearing bad? Shaft out of balance? Don't know where to start. Don't really want to start throwing money at it. Any way to tying to help pin point it

Starting to get a bad vibration in the seat and the floor that is really noticeable around 55-60 mph. Just had all 6 tires road force balanced yesterday and that didn't help. Which my buddy told me it wouldn't help. Hes saying ujoints. I tried moving the shaft around to see if I could see any slop anywhere but couldn't. Just did a complete brake job also. Could the drums be out of balance? How hard is it to change ujoints? Do you need special tools and presses? Carrier bearing bad? Shaft out of balance? Don't know where to start. Don't really want to start throwing money at it. Any way to tying to help pin point it

Starting to get a bad vibration in the seat and the floor that is really noticeable around 55-60 mph. Just had all 6 tires road force balanced yesterday and that didn't help. Which my buddy told me it wouldn't help. Hes saying ujoints. I tried moving the shaft around to see if I could see any slop anywhere but couldn't. Just did a complete brake job also. Could the drums be out of balance? How hard is it to change ujoints? Do you need special tools and presses? Carrier bearing bad? Shaft out of balance? Don't know where to start. Don't really want to start throwing money at it. Any way to tying to help pin point it

Im in the same boat. A new Spicer carrier bearing comes in tomorrow, i'll have it in next weekend. Next, I have to replace one front wheel bearing and check u joints. Check your front wheel bearings and ball joints with the prybar method.

No shake at all in the steering wheel. Floor and seat only

Push up hard on your driveshaft and see if the rubber is perished on the carrier bearing. With a slight push mine hardly moves but when I put my weight into it it moves almost 3/4 of an inch. I am hoping that is my cause. U joints are suspect though too.

Will give that a try

Only way to really check u-joint right is remove the shaft. Also while the shaft is out double check the weights on it. You might find a old weight has flew off and you'll see the old spot weld.

when you replace it, take it where they have a heavy duty press as mine almost stalled a 12T press when taking the bearing off. they almost cut it off.  i have a write up on how to replace it all in the article section.

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/28-transmission-systems/244-driveshaft-center-carrier-bearing

Edited August 29, 201410 yr by CUMMINSDIESELPWR

you do the brakes?    

 

ummm,   check your   driveshaft for  dents.  fresh gouges,    missing   weights... etc.  

 

reason I ask:    sometimes  overzealous  guys  get a little   sloppy  aligning  the  lift  under the  vehicle... and     hook/snare the prop shaft..   

 

If  it's vibrating  THAT bad  due to  ujoint.... you should  be able to hear it   clunk snap... going  from  D to R

 

 

In your best   guess.... what's  the frequency of  the vibration?    chainsaw type  buzz... or   more  like  a  flat spot  on a tire?   Tires  @   60mph  are   running  about  450-500  rpm..  so it'd be  about  8  thumps per second.. 

Edited August 29, 201410 yr by rancherman

you do the brakes?    

 

ummm,   check your   driveshaft for  dents.  fresh gouges,    missing   weights... etc.  

 

reason I ask:    sometimes  overzealous  guys  get a little   sloppy  aligning  the  lift  under the  vehicle... and     hook/snare the prop shaft..   

 

If  it's vibrating  THAT bad  due to  ujoint.... you should  be able to hear it   clunk snap... going  from  D to R

when mine went out, it actually walked its way out of the housing and i was feeling a hard bang when i went on or off throttle. hopped under and it was seized. limped it home and fixed it next day.

Pull driveshafts and rotate all the u-joints. Shouldnt have any grinding or catching. Like said check for any spots where a weight fell off.

If you do have u-joints I use a bfh and a vise for beating. I cant use a press because it takes too long

yep a brass drift and a BFH will knock em out easy. takes 5 minutes to replace a ujoint once you get everything ready and off the truck

Edited August 29, 201410 yr by CUMMINSDIESELPWR

Pull driveshafts and rotate all the u-joints. Shouldnt have any grinding or catching. Like said check for any spots where a weight fell off.

If you do have u-joints I use a bfh and a vise for beating. I cant use a press because it takes too long

I've  'graduated'  up to  torching out the old cross!    cut  the ol  girl  across the  'cross'..  and    viola!    tap tap..  home free.   

ahh the ole gas-axe 

ahh the ole gas-axe 

LOL...  'gas axe'... 'hot wrench'..     The  only thing  I don't like about  torching out  a  bad  cross,  is  when the  grease  explodes...plus the  stink of  burning  rubber seals..

lmao

i use a socket the size of the u-joint cap and one big enough for the cap to go into. then into the vise it goes. easy to press them in and out. if they still have the factory plastic then take a torch n heat em till it melts then they press out easy. the new ones will have c clips.

I typically just use the Harbor Freight Ball Joint Press to change u-joints. Take my impact to press in and press out... Absolutely no problems here.

Another vibration issue I have seen before are bad shocks. Does the vibration just get worse the faster you go? Or does it stop vibrating at a certain speed? Say it vibrates from 55 to 65 then goes away. If that is the case it could be worn out shocks.

Yes vibration starts around 50-55 and up. I have new shocks in front but did not do the rears because I have air bags and didn't think they would help or hurt

Edited September 1, 201410 yr by rseabur