Hello! Thanks for stopping in.
Background: This is a 4-speed manual with 217k miles on the clock. However, the motor, transmission, and transfer case were all removed and rebuilt by a Toyota dealership about 30k miles ago (7 years). It is practically rust-free and spent many years in Montana.
The problem: The truck runs great. However, when it is in gear and I am accelerating or decelerating there is an audible whining noise. It is loud enough to be quite annoying. The noise is not there (or not audible) when the truck is idling or rolling in neutral, even at highway speeds. If I am in gear, I can also get the sound to go away when I put just enough pressure on the gas pedal to be neither accelerating or decelerating.
UPDATE: As I mentioned, the whine occurs when in gear in both 2wd and 4wd drive. In an effort to isolate the issue further, I locked the hubs but put the transfer case shifter into neutral to disengage the drive shaft. I then put the truck into first gear and took my foot off the clutch, as if I were driving. No whine. To me, this suggests the problem is with the transfer case or driveshaft.
Solutions I have tried that did not help:
Background: This is a 4-speed manual with 217k miles on the clock. However, the motor, transmission, and transfer case were all removed and rebuilt by a Toyota dealership about 30k miles ago (7 years). It is practically rust-free and spent many years in Montana.
The problem: The truck runs great. However, when it is in gear and I am accelerating or decelerating there is an audible whining noise. It is loud enough to be quite annoying. The noise is not there (or not audible) when the truck is idling or rolling in neutral, even at highway speeds. If I am in gear, I can also get the sound to go away when I put just enough pressure on the gas pedal to be neither accelerating or decelerating.
UPDATE: As I mentioned, the whine occurs when in gear in both 2wd and 4wd drive. In an effort to isolate the issue further, I locked the hubs but put the transfer case shifter into neutral to disengage the drive shaft. I then put the truck into first gear and took my foot off the clutch, as if I were driving. No whine. To me, this suggests the problem is with the transfer case or driveshaft.
Solutions I have tried that did not help:
- checking and topping up trans and TC fluid (I am also going to add one of shipmag's trans to tc hoses as the tc was low and the trans too high)
- putting truck in 4wd hi and lo and then back to 2wd
- checking and topping up power steering fluid
- adjusting/rubberizing the dust shield on the transfer case output shaft
- Greasing driveshaft u-joints
- trans shift lever seat
- the 3 crank belts
- idler shaft in the trans (this appears to be the most common suggestion when I searched threads, but the trans was recently rebuilt so it just seems unlikely)
- power steering pump (just seems unlikely since the sound does not occur when I am driving in neutral or with the gas pedal barely depressed)
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