wierd thump when letting off the gas - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 03-22-2009
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Icon4 wierd thump when letting off the gas

ok i know it might be in here but i dont have time to look. i ave till Wed. to get this fixed. due to the fact the i go in for surgiry and will be off my feet for two weeks.

this started happening a day ago, as im going down the road and fully let off the gas without pushing in the clutch i get a small thump or pop from the rear of the truck.

i dont know if its the pinion bearing or what. i was under it and didnt find anythin loose.

anyone got an idea???
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Old 03-22-2009
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is it happening only as soon as you let off the gas or when you let off the gas and then step on the gas again?
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Old 03-22-2009
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just when i let off.
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Old 03-22-2009
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i was gonna say if it happens when you step back on gas, that ur u-joints could be bad, just replaced 1 of mine today.

may something else in your driveshaft?
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Old 03-22-2009
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engine mount?? just yesturday my friends engine mount bolt came off and that thing was rocking.. every stop it would thump unless he was getting off the gas slowly.
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Old 03-31-2009
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Mine does this too when I let off the gas and the step on it again, hard or softly. They looked at the U-Joints last time I was in the shop and they said they looked fine.

Also, when im stopped and then begin accellorating, there is a squeeking sound comming from the back end until it changes into 2nd gear. And it only makes the sound when I accellorate. If i let off the gas it stops. Any ideas? Sorry for the thread jack.
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Old 03-31-2009
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if you dont have a signature you need to make one with your truck specs makes answering questions alot easier
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Old 04-01-2009
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My Bad, Its Done Now.
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Old 04-01-2009
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Try replicating the problem doing different things. 4wd engaged, reverse, etc... 5spd or auto? TC could be going t!ts up if it's an auto...
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Old 04-01-2009
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check your u bolts.. if the come loose it will cause ur axlw to twist.. yes its happen to me.
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  #11  
Old 04-01-2009
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U joints....Done it to me twice.


It may also squeek when you first take off.
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Old 04-01-2009
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Slip joint, isn't that a problem on these trucks, I know my old trucks did it.
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  #13  
Old 04-01-2009
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Huh, I guess U-Joints it is because it does make a squeeking sound when taking off. Now is this something someone can do in a driveway with a couple tool sets mixed together? Or should it be done professionally?
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Old 04-01-2009
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Quote:
Originally Posted by dangerfish View Post
Huh, I guess U-Joints it is because it does make a squeeking sound when taking off. Now is this something someone can do in a driveway with a couple tool sets mixed together? Or should it be done professionally?
When mine where making those sounds they where so bad I am suprised it didn't leave me stranded.

You can do it with some basic tools and a hammer, but if you never done it before I suggest seaking help from someone that has.
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  #15  
Old 04-05-2009
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Alrighty, took my baby to the shop today and got both U-Joints replaced. No more squeeking, no more clunking in the back end, and no more deep vibration between 60 and 65 mph.

Thanks guys.
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  #16  
Old 04-05-2009
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Glad you figured it out.

I was going to say mine does it when I got a full tank of fuel. I think it's called fuel slop. The gas hits the top of the tank with a slap i guess.
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