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I have a vibration in my car when accelerating above 100 -120 Kph on passenger side I am assuming its the passenger side axle .Does anybody know if there is a difference between the passenger side and the driver side because my passenger side axle is not the original and i need to know the exact OEM number .
i have changed the front axle with the part # 4D407272 AF but the vibration it is still there from 100 kph + and on . My mechanic said it could be the trans mounts . I have done all 4 wheel balancing and no result with the vibration . so any clue ?
i have changed the front axle with the part # 4D407272 AF but the vibration it is still there from 100 kph + and on . My mechanic said it could be the trans mounts . I have done all 4 wheel balancing and no result with the vibration . so any clue ?
Could still be the tires being out-of-round. Rotate the wheels (front to back) and see if the vibration moves also. A zero cost thing to try first.
In looking at a US market 98 A8q diagram, the 4D0-407-272-AF supercedes to 4D0-407-452-AX, no specs for length are given in etka, can you confirm the # you installed in the car? If you did use an aftermarket, sometimes even when you use the OE # to order it, you can get a mis-boxed one or just plain wrong. We've had that happen here with aftermarket axles and Audi cars, for our employees for example. If this happened to you and you torqued into place an axle that is shorter just slightly than the one you took out, I imagine all kinds of strange things could happen at different speeds.
In looking at a US market 98 A8q diagram, the 4D0-407-272-AF supercedes to 4D0-407-452-AX, no specs for length are given in etka, can you confirm the # you installed in the car? If you did use an aftermarket, sometimes even when you use the OE # to order it, you can get a mis-boxed one or just plain wrong. We've had that happen here with aftermarket axles and Audi cars, for our employees for example. If this happened to you and you torqued into place an axle that is shorter just slightly than the one you took out, I imagine all kinds of strange things could happen at different speeds.
It would have to be SIGNIFICANTLY longer or shorter to be any problem at all, since the inner triple roller joint has a huge length of in/out movement...necessary to accommodate the constantly changing length of the axle while driving, with suspension travel and steering.
In looking at a US market 98 A8q diagram, the 4D0-407-272-AF supercedes to 4D0-407-452-AX, no specs for length are given in etka, can you confirm the # you installed in the car? If you did use an aftermarket, sometimes even when you use the OE # to order it, you can get a mis-boxed one or just plain wrong. We've had that happen here with aftermarket axles and Audi cars, for our employees for example. If this happened to you and you torqued into place an axle that is shorter just slightly than the one you took out, I imagine all kinds of strange things could happen at different speeds.
I installed the axle with part # 4DO407272AF the one that I had on my car was 8D0407271 AX . I have measured them , the one that was installed on my car was shorter by 1.5 Cm. and thinner but nothing changed in my car regarding the vibration I will go and check today the front rims and tires and balanced them once again .I have the original S8 6 Spoke rims model 1998 .
I installed the axle with part # 4DO407272AF the one that I had on my car was 8D0407271 AX . I have measured them , the one that was installed on my car was shorter by 1.5 Cm. and thinner but nothing changed in my car regarding the vibration I will go and check today the front rims and tires and balanced them once again .I have the original S8 6 Spoke rims model 1998 .
How did you measure? With both joints on the shaft, accurate measure is impossible...the inner joint only sits where the rubber boot puts it.
Silverd2 is correct with that. Also the outer joint sits where the boot tells it to as well. There is flexibility in total length, but it's something to check. I couldn't get the 8D0-407-271-AX with or without the A or AX to work for me, plus the odd # 271 indicates left side and the installed shaft ends in 452 indicating right side. I hope that isn't a problem? Then again I can't see that the 8D0407271AX is a good part number anyway. Please check again?
07-29-2014, 03:53 AM
Front Axles Drivers side vs passenger side
