Rear differential whine?

[rowhard]

Joe, I'll be honest, it could be as simple as a backlash adjustment that you can eliminate with shimming. BUT, it takes special tools for measuring and knowing what the heck your doing. Yes, any mechanic with the training, tools and spec's could do it, just finding one that would do it. Most just want to replace something, not repair it. And yes that is the name we call it. The British I believe call the ring gear a crown gear, can't remember what the call the pinion gear off hand.

[rowhard]

Joe, I'll be honest, it could be as simple as a backlash adjustment that you can eliminate with shimming. BUT, it takes special tools for measuring and knowing what the heck your doing. Yes, any mechanic with the training, tools and spec's could do it, just finding one that would do it. Most just want to replace something, not repair it. And yes that is the name we call it. The British I believe call the ring gear a crown gear, can't remember what the call the pinion gear off hand. If you have the workshop manual downloaded into your home computer, it starts on page 334

[Joe Isuzu]

Thanks as always rowhard. Now, I'll be honest. There ain't no way I'm messing with this thing myself
Shoot, this is one of the few parts on a car I have no idea where it's located. I'm certainly now going to try and fiddle with it solo. Appreciate the encouragement but the tranny job was enough for me for the time being.
I will have to deal with the TOD fluid change though sometime this month. I did everything else it seems except that one.
OK, let's see how things go with the Isuzu place. The last time I had them check for the roar the mechanic said he didn't hear anything abnormal. Sorry, there's a definite roar under throttle at certain speeds. I hope we don't play this game again...

[jetz86]

Konichiwa from Japan.

I have an automatic 3.1 litre VX I have the same problems with a clunking sound when going from Park into Reverse/Drive also travelling at a low speed the engine sounds like it's revving out! The whine sound only seems to occur when the VX is in low gear then subsides after. Is this normal? Or should I be checking the UV joint and dif oils?

Any advice appreciated

Jetz

[LittleBeast]

Gear Noise
Gear noise (whine) is audible from 32 to 89 kmlh (20 to 55 mph) under four driving conditions.

1. Driving under acceleration or heavy pull.

2. Driving under load or under constant speed - -

3. When using enough throttle to keep the vehicle from driving the engine while the vehicle slows down gradually (engine still pulls slightly).

4, When coasting with the vehicle in gear and the throttle closed. The gear noise is usually more noticeable between 48 and 64 km/h (30 and 40 mph) and 80 and 89 km/h (50 and 55 mph).



Bearing Noise
Bad bearings generally produce a rough growl or grating sound, rather than the whine typical of gear noise. Bearing noise frequently “wow-wows” at bearing rpm, indicating a bad pinion or rear axle side bearing. This noise can be confused with rear wheel bearing noise.



Rear Wheel Bearing Noise
Rear wheel bearing noise continues to be heard while coasting at low speed with transmission in neutral.
Noise may diminish by gentle braking. Jack up the rear wheels, spin them by hand and listen for noise at
the hubs. Replace any faulty wheel bearings.



Knock At Low Speeds
Low speed knock can be caused by worn universal joints or a side gear hub counter bore in the cage that is worn oversize. Inspect and replace universal joints or cage and side gears as required.



Backlash Clunk
Excessive clunk on acceleration and deceleration can be caused by a worn rear axle pinion shaft, a worn cage, excessive clearance between the axle and the side gear splines, excessive clearance between the side gear hub and the counterbore in the cage, worn pinion and side gear teeth, worn thrust washers, or excessive drive pinion and ring gear backlash. Remove worn parts and replace as required. Select close-fitting parts when possible. Adjust pinion and ring gear backlash.
MY2000 Isuzu VehiCROSS Workshop Manual Page 1


*****Just to let you know I simply printed the part in discussion and then scaned it into my computer using a Text converter, I didn't think it would be that easy but it was.*****

[LittleBeast]

So I either have:
-bad pinion
-bad rear axle side bearing
-worn rear axle pinion shaft
-worn cage
-excessive clearance between the axle and the side gear splines
-excessive clearance between the side gear hub and the counterbore in the cage
-worn pinion and side gear teeth
-worn thrust washers
OR
-excessive drive pinion and ring backlash

oh that really helps, I don't even know what half of those things are!!!!! LOL
Mine is not that bad and certainly only happens when I get OFF the throttle, so I might live with it for a while. We will see. Any thoughts?