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Hi Everyone,

I am looking at the 900i '93 with about 200k km on the clock. It looks like a nice enough car, well maintained and regularly serviced.

However, there is one major issue and that is the gearbox noise. It's not much and you could easily miss it if you don't know what to listen for. Anyway, the noise is there in all gears and it increases with load.

My first thought was pinion bearing, but the mechanic who serviced the car (an independent saab specialists) claims it's the bearing on the right-hand side CV driver.

Now, I am just wondering what is his claim based on - is it possible to differentiate between the noises caused by faulty pinion and driver bearings ?

Furthermore, is there any way for me to confirm that it is the driver bearing that's faulty ?

Any input is appreciated

Cheers
Goran
 

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Goran9000 said:
My first thought was pinion bearing, but the mechanic who serviced the car (an independent saab specialists) claims it's the bearing on the right-hand side CV driver.
Pinion bearings initially make noise only in 5th, later in 4th, then 3rd, then BANG.
- is it possible to differentiate between the noises caused by faulty pinion and driver bearings ?
Pinion bearings make noise only under load in the higher gears.
Furthermore, is there any way for me to confirm that it is the driver bearing that's faulty ?
Listen to it with a stethoscope while it's running on a lift.
 

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If it's inner drivers they usually vibrate under load, CV joints just click on corners. Whines under load suggest gearbox bearings.

Mind you all C900's sound a bit turbine like due to the chain drive transmission, so it could be normal....
 
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