Rear differential whine?

[Joe Isuzu]

I need to hear from all the people who had a loud roar/whine between 55-70 when you apply throttle. I've read several of the posts but they seem to be from '04 and older. With that in mind, I don't know how many of these people are still members of this forum.
I have a loud roar under throttle between those speeds, at first I thought it was tire roar but letting off the throttle makes the noise disappear and then you only have roof rack noise, tire roar and wind noise. Did anyone get that resolved? If you've seen my posts, you know I've recently done both the trannsmission fluid change and front/rear axle fluid changes, but the roar is still there. The VX is not lifted, doesn't have oversized tires and the roar is definitely from the rear.

[nfpgasmask]

I have had a roaring noise that comes from my rear end for a while now. And no, not from eating too many beans.

The problem I have though, is after I start up, I hear a weird roaring/groaning sound that seems to come from the rear end, and then goes away after a few seconds. I can't imagine what the noise could be. I plan to do my diff fluids soon, so I will see if that sound goes away then.

Bart

[LittleBeast]

Ever since I lifted I get a weird whine/roar from my driveline somewhere sounds like it is from the rear, but I only get it when I let off the gas over 55 mph or so, does not happen at lower speeds, does not happen when accelerating..... My dad seems to think it might be vibrations from the crazy tread pattern on the new tires, but I remember noticing it after the lift before the tires went on, I thought it was simply wind going underneath the VX different than normal, sorry no help, but I experience this kinda. Could this be from changing to full synthetic diff fluid? Do we need thicker fluids?

[kodiak]

The rear dif does require limited slip dif fluid. At least that’s what they charge me for when I get it serviced.
But you probably have a locker.

[tomdietrying]

Check your U-Joint. My vehicle would would rattle and shimmey when I got to higher speeds. I took it to an ex-Izusu dealer. The mechanic said it was my tires separating from the tread. I then took it to three different Discount Tires to have them check the tires. They said it wasn't the tire, but it was out of balance. After getting their top of the line wheel balance, the problem was still there. I then took it to a Izusu dealer which is still in business. He took it for a drive, it rattled, he let off the gas, and then there was no more rattle. He said........"yep, that's a bad U-Joint.

He changed the U-Joint, and it mhas been the smoothest drive my VX has ever had. Check that out......that my be it.

Peace.
Tom
012009

[Joe Isuzu]

good suggestions, I know it's likely not tire related as I had this issue when I first got the VX, then I replaced all 4 tires in the hopes of quieting the noise (which, once again I thought was tire roar) and still had the noise, I've also rotated the tires since I replaced them
Just a reminder, I only get it on throttle and it goes away when I lift off the throttle, also, it only happens at highway speeds

[Kenny]

I got the same noise after the lift. I think it's just the driveshaft + thin floor. I also notice it more with the skid plates on - they probably reflect the sound back.

Check your fluid levels - replace axle oil if its been a while - as well as the TOD case.

Check the U-joints (see if there's any play in the drive shaft when you try to turn it by hand...)

Check your emergency brake tension

Check the rear rotors - discs for corrosion


Check the inside of the rear rotors for a loose drum pad (E-brake) or worn pad.

If all else, maybe rear bearings....

Also, meet up with a fellow VXer and try their ride to see if it's they have same noise....

Good Luck.