This is getting old. Vibration/Shudder

[yobie]

Hello,
I have been trying to figure this vibration/shudder out for forever with no luck. I am getting a major shudder felt in the steering wheel/gas pedal and just in the car in general. It happens when the below are present

- 30-40 MPH (1500-1800) RPMS
- 3 or 4th gear

I have balanced the driveshaft changed out U joints and recently had the torque converter replaced. I also had the trans rebuilt.

What am I missing I'm tired of pouring money into this thing. The shudder happens when the gas pedal is pressed only, when I let off it stops????

Any help would be appreciated.

-Matt

99 f450
2wd 4.88

[jacobm24]

I had this type of problem after I added my lift.. So I just shimmed the drive shaft. but it doesn't seem like that is the same problem you're having..sorry

[yobie]

i know its not U-joints, tires, or rotors. My power steering fluid looks good. I have no idea what it could be. Considering I just had TQ and trans rebuilt and it only happens when accelerating/pressing the gas pedal.

[atvrider93]

Is it more of a side to side shudder or front to back?

Sent from my DROID BIONIC against my will

[wayfastwhitey]

mine did the same thing and i replaced a u joint and it went away for like a week and started doing it again im trying to get it to go away aswell

[Im_Strokin_ur_Cummins]

I replaced the hydroboost unit and it fixed my shudder problem

[Turbostang500]

I may be a little off here, but it sounds to me like your complaining about an engine problem. Is the engine misfiring causing the shudder?

[yobie]

Originally Posted by Turbostang500

I may be a little off here, but it sounds to me like your complaining about an engine problem. Is the engine misfiring causing the shudder?

I thought about this, but i'm not sure exactly how to diagnose a misfire. I was thinking it may be injector related, but I'm not pulling any codes and have no smoke. I have felt like my truck has been underpowered lately and was going to make a post next about that lol.

What should I be looking for in a misfire?

[yobie]

after a little research I think it might be the UVCH. It seems to be a problem with these trucks as it comes unplugged under the valve covers. Welp I know what im doing all day. I will check the ohms first tho to see which side it is.

[jacobford]

mine was doing the same thing at about 300k miles, just changed the hpop and it went away... it was shuddering like that under acceleration and mostly in 4th gear... down shift into third and get the rpms up it went away... might wanna look into that as a problem...