6 months ago I had the pinion nut back off on my while I was driving, so I replaced the third member. While I had everything apart I redid the rear brakes, had the drums resurfaced, new pads, adjusted everything as per FSM. Now I have some strange whining noise that I cannot locate.
- The noise is barely audible in 2nd gear, gets louder in 3rd, and loudest in 4th.
- The noise is only audible when I am trying to accelerate (Goes away when I let off the gas or when I put it into neutral)
- The noise only comes out in high range (2WD and 4WD), goes away in low range
- The noise does not show up when the t-case is in neutral and I go through the gears
- the noise gets louder up to 2500 RPMs, and then drops off substantially
- It is not coming from the engine bay, definitely tranny/t-case or back
- The noise is there with the front hubs engaged and disengaged
Last night I dropped the rear driveshaft and examined the pinion flange, and I did not have much play at all. I could turn it maybe 4* either way before it stopped (Parking brake was on).
I got new tires yesterday (Went from 33" to 31"). I was hoping this would help, but it has not
My working theories: U-joints could be bad, Pinion bearing in the new third may be bad (Could just swap front and rear maybe?), warped brake drums? (O'reilly royally screwed them up when they did them, took three tries to get it to where I couldn't feel scoring)
Any thoughts? Ways to narrow down the problem?
- The noise is barely audible in 2nd gear, gets louder in 3rd, and loudest in 4th.
- The noise is only audible when I am trying to accelerate (Goes away when I let off the gas or when I put it into neutral)
- The noise only comes out in high range (2WD and 4WD), goes away in low range
- The noise does not show up when the t-case is in neutral and I go through the gears
- the noise gets louder up to 2500 RPMs, and then drops off substantially
- It is not coming from the engine bay, definitely tranny/t-case or back
- The noise is there with the front hubs engaged and disengaged
Last night I dropped the rear driveshaft and examined the pinion flange, and I did not have much play at all. I could turn it maybe 4* either way before it stopped (Parking brake was on).
I got new tires yesterday (Went from 33" to 31"). I was hoping this would help, but it has not
My working theories: U-joints could be bad, Pinion bearing in the new third may be bad (Could just swap front and rear maybe?), warped brake drums? (O'reilly royally screwed them up when they did them, took three tries to get it to where I couldn't feel scoring)
Any thoughts? Ways to narrow down the problem?