Whirring/whining noise from rear trans-axle

Provided that this is a rear-wheel drive vehicle, there are a number of things which can make noise when you accelerate. Most are due to excess clearance in moving parts. This means some parts are worn out.

On the outside, the U-joint next to the rear differential can be worn and make noise. Inside the differential, usually a pinion bearing(carrier bearing) can make a noise like a whine or growl depending on the gap.

Now in the axle tube, the axle shafts have a bearing on each wheel. Like any bearing, when they wear out, noise usually indicates failure.

When Torque is applied on acceleration, the parts shift creating noise. If you have a Limited Slip Differential, there are clutch plates which have a material which can wear out. These types of rear ends also need a special Additive to make the parts work. Sometimes you get a clatter when the additive is low.

Have the U-joint checked first as it is the only external part to check. The rest will need disassembly.

Please rate my info.

you would only experience problems from the diff if there was a substantial increase in torque from the different engine as there would be less than 10% difference in torque ratings , Any noise from the diff would be naturally occurring from wear or oil
diff noises indicating bearing problems are a whine on drive or coasting , an growl on deceleration and a harmonic whine or growl when the vehicle is held at steady speed Other than those indications , I would be more inclined to suspect wheel bearings and brake associated noises
wheel bearings are normally more pronounced on cornering

You may want to check into a recall!! If the problem occurs during accleration between 20-40 mph, Call your local dealer.

The bearings usually make a kind of rumbling sound, whining usually is gears that are not set up right. They would have to have your differential out in order to replace all of the bearings, if that is the case you need to get it back to whoever did the work and have them make it right. You should get it back to them before any major damage occurs.

It sounds like you differential gear noise by your description.

Flush torque converter and tranny flush. If you suspect that's the noise. Pump transmission

It's the fuel pump and they do that.

check for vacuum leak

Sounds like youi may have a few serious problems going on to have that kind of back lash occuring at higher speeds. I have experiance with low spped clunks on Bronkos and your type of vech being a car dealer. One you might try for low speed clunk on take off and braking at stop likts just completeing a stop? Pull the drive shaft and lubricate the splin - two check your leaf springs for weakness and wore bushings - take a look at your shocks - three u bolts holding springs to rear axle housing may be letting the axle housing actually dip or tweak or all those thing in combination - now you may have some serious slop in the pig - transfer case may be causing that clunk - as far as high spped clunk and activity you have a serous problem and you just might drop the transferr case have an accident fliping over..............Mike South Bend Indiana don't just keep driving and making problem worst...........

damage is possible if driveshaft does not have room for movement and slams in transmission. sounds like your pump is going bad