Rotate tires to see if noise moves.
Testimonial: "Ok, I put it on jack stands, set the brake, started it, put it in drive (it's automatic) the noise is coming from the RF axle I will change it, have 1 question is there a bearing in the trans where the axle goes in? Thanks for the help Robert"
There are differential bearings. I've never heard an axle "roar". With it in the air, listen for noise with stethescope. (long screwdriver works) See which end of axle noise comes from. If it is from the trans, diff bearings or output shaft bearing could be bad. Don't rule out the wheel bearing, new bearings can be bad. You said the noise gets louder on decel, that could definately be a diff. bearing. Wheel bearing noise changes when turning wheel. Make sure it is safe when under car, jack stands secure, jack still in place, wheels slid under car. Shake car, it should feel stable. Be safe.
I'm guessing output shaft bearing and differential bearings are the same thing
do you have to pull the trans to get this bearing out or can remove it when you remove the drive axle. I"ve work my cars since I got my first one in 65, just not good at diagnosing the newer ones
These are internal transaxle bearings.
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I'd check the exhaust by the back of the engine. The gasket that connects the catalytic converter to the tail pipes could have come loose. If you have a power lowering problem going uphill this will be the cause too. If it is an automatic transmission you will have a irregular shifting pattern as well. Good Luck, hope this helps.
You can feel which side it comes from. I can. Bearings or CV axles. Bearings will make a louder or softer sound left to right. CV axles will make a constant sound, no matter which way you turn. Replace the CV axle/s
Testimonial: "has new bearings on both front, cv joints appear to be good on the spindle end don't know about where it goes into trans Thanks for the help Robert"
To check CV joints. You have to pull them out from the vehicle. Move them around and check for flat/rough spots on both ends. Most likely the bear/wheel side. If you fell roughness then this will cause vibration/noise. Depending on how bad it is . On the spindle end of the axle, if you feel any roughness spinning at any angle by hand. The axle needs replaced. It will cause a vibration at all speeds, mostly felt at higher speeds. Inner part of the axle is harder to detect going down the road. But is easy by hand. Again the cv axle should be smooth at any angle by hand.
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