Should i get rid of the car if the rear differential needs to be replaced
I have had the pre-certified car two weeks when I heard this humming noice and they had to replace the whole rear differential - I feel like the car is a lemon - I am not happy.
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When you turn and hear a noise it is usually a CV Joint that is going bad. Humming can be a lot of things. Tires wheel bearings, rear end differential etc.
It shouldn't continue to hum. If it does that would indicate that there was mechanical damage due to lack of fluid and the whole differential would have to be replaced.
The Buick Rendezvous has this common problem,it starts with the tube that goes into the top of the differential and allows water to enter,this diff uses a special GM fluid called Versatrack and is expensive,any attempt to use a heavy duty fluid spells disaster.We
stock complete differentials for these vehicles direct from the Magna factory in Austria,they have a RDM unit inside of the housing and no parts sold seperately because there are two valves
that must be set at the factory (temperature and pressure release)
and when the water mixes with the Versatrack fluid and destroys the clutch pack and valve settings.This is where your noise is coming from,our part number for the unit is 740D-1 (it's a OEM unit)
sounds like a bad wheel bearing..if drum brakes,remove drum and center cap from wheel bearing..remove center nut and pull bearing from spindle..replace hub/bearing assembly and center nut..if disc brakes,remove caliper/rotor,and hub/bearing assembly
I would tell the dealer you want your rear differential opened up, checked, and more fluid added. There really is no test they can do other than to pop the cover off the differential.
check the differential fluid in the rear differential. if the fluid is low, add fluid and see if the noise is still there, if the fluid level is ok see if the fluid appears metallic, if it is metallic looking or excessively thick it would be a good idea to have the bearings checked out. i am in the process of rebuilding a front differential on a 98 jeep grand cherokee for the same problem. the bearings inside the differential on the carrier and pinion gear were worn out causing a humming noise. if the wear is excessive the gears might also need to be replaced
This rear end needs to be replaced or re-built. The gears and or bearings are worn/shot. May be able to get a complete rear end from a Junk yard for much less, one in good condition. Good Luck
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