Loud sound - rough riding....

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  #1  
Old 05-29-07, 02:21 PM
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Loud sound - rough riding....

1991 Toyota Pickup
4 cylinder
5 speed
4WD (when I engage it)

Ok...here's the situation.
Whenever I push on the gas, as I get to around 40mph, I start hearing a loud humming noise. The truck doesn't sputter. The noise is completely gone when I lift off the gas pedal (but comes back when gas is pressed again). The tires have been checked and the tread is fine...I don't know where else to start looking.

Any thoughts on this?
thanks
matt
 
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  #2  
Old 05-29-07, 02:28 PM
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Is it coming from the rear? Most likely it is your rear differential.

There should be a drain plug on the "pumpkin". Remove this and see what the fluid is like. If you do not have this drain plug, you have to remove all the bolts to the pumpkin cover.

Let us know if the noise is coming from a different location.
 
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Old 05-29-07, 02:44 PM
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ummmmm....pumpkin? I am pretty auto ignorant. I hear pumpkin and hope the next word is pie. Can you explain what that is?
 
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Old 05-29-07, 04:17 PM
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Thats your rear axle, right in the middle, where the drive shaft goes into.
 
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Old 05-29-07, 04:30 PM
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so....is this something that can fall apart while I'm driving it? Can I still use the truck until I can get it in the shop? I drive about 25 miles each way for work. Is this problem dangerous?
 
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Old 05-29-07, 04:46 PM
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Well, is the area that I am talking about have this sound?

If this is what the problem is, it will jsut get worse until you will not be able to drive it.
 
  #7  
Old 05-29-07, 05:53 PM
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I think it might be....I don't think it's coming from the engine.
 
  #8  
Old 05-29-07, 07:51 PM
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Is it at 40MPH, or is it at the RPMs that you usually approach 40MPH at?
Know what I mean?
Can you get it to make the noise at other MPH speeds in different gears by keeping the engine at the same RPMs you usually hear the hum at?

Does it go away at higher RPMs?
 
  #9  
Old 05-30-07, 02:24 PM
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Hey Slick...thanks for not saying "well Rapture, all your tools and you can't fix it"

It was around 40mph and 3rd gear. I went to the local shop thinking it was the rear differential....ended up being the "U" joint in the rear. I looked at it and was shocked it didn't break sooner....pretty messed up. Less money to replace. I guess it's the lesser of two evils. Anyways, thanks for the advice...getting fixed as we speak.
 
  #10  
Old 05-30-07, 02:34 PM
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I didn't think you had one of those Huge Presses for U-Joints in the garage anywhere
They are hard to loose

..and there's not much else you can use them for either...lol

Good thing you found it, that could get messy (ugly) if it broke on the road
 
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