big problem... - Toyota Nation Forum : Toyota Car and Truck Forums

patty16 · 09-08-2008, 07:52 PM

Hi, my name is Patrice

I just join that group recently. I own a pick up 4x4 1991 with the four cylinder engine. Here is my problem. When i am driving over 80 kpm i can ear a loud noise (and the truck is shaking) comming from under the truck, somewhere between the engine and the back. The noise get louder while i'am going faster. If i put the truck on neutral while it running (over 80)the noise is still there. If I push the cluth pedal, the noise is still there. BUT, if i'm releasing the gas pedal i am not earing the noise anymore ??? At the moment that i put the feet on the gas pedal the noise is coming back...IT is not the muffler (that is for sure). Do you think it's the differential or the transfercase ? Can it be a universal joint ?

Thank's for the answer

***IronNam*** · 09-08-2008, 10:34 PM

driveshaft must be out of balance

denniswoo · 09-08-2008, 10:38 PM

i agree it sounds like the drive shaft.check all the joints make sure they have grease and aren't loose when you move the shaft at the u joints.if one of them has bad needle bearings it will most likely be dry and really loose.

boypilot · 09-09-2008, 03:31 PM

I had the exact same problem. The bearings in the rear u-joint fell apart and were causing the drive shaft to shake. Just replace the u-joint and you should be golden.

Vicoor · 09-09-2008, 06:56 PM

could be u-joints, climb under and see if the ujoints have play, and see if they get hot after driving.

But your description sounds more like a a differential or trans problem.

Krusty · 09-09-2008, 07:19 PM

u-joints

boypilot · 09-10-2008, 11:12 AM

you could always put it up on stands and look under there while its running in drive. See if anything isn't normal... like drive shaft wobble.

***IronNam*** · 09-10-2008, 09:16 PM

ARE YOU TELLING HIM TO PUT JACKS UNDER THE REAR DIFFERENTIAL ASSEMBLY AND PUT IT IN DRIVE?!

kinda crazy, but possibly dangerous

boypilot · 09-11-2008, 10:28 AM

If your carefully and smart about it it's perfectly safe. You gotta get all four wheels off the ground and make sure its stable but I've done it dozens of times. I gives you the opportunity to really see whats going on down there.

***IronNam*** · 09-11-2008, 05:16 PM

haha i would trust my self to do it on a 2wd tho. and alot of jacks. its reasonable anyway

***Jayota*** · 09-12-2008, 12:30 AM

Does it make the noise in reverse? Sounds like when it transfers load to the backside of whatever is making the noise is stops. U joint probibly.. Thank goodness they are easy to replace.