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#1
09-22-2011, 02:30 AM
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knocking from drivetrain under hard acceleration
I have a loud rapid knocking sound from the drivetrain (sounds like from the front) under full throttle from a standing start. its short - maybe 4 or 5 solid knocks as the car moves from a stationary position. No noise at all during rolling acceleration. This occurs with no steering lock on and there's no noises from any of the the CVs when turning - both fronts are refurb items and are in good condition. My indie says he's never heard the sound before. I have just had the following replaced: front caster bushes, diff bush, RHF control arm and had a wheel alignment done. Indie says the suspension is in good shape. I have searched the site as well as I could, and the only things I could find was transfer case chain slipping or a drive shaft bearing failing. Do either of these sound right in my case? has anyone had anything similar? Car is a 2003 4.4i E53 X5 with 143000kms (approx 90,000 miles) cheers David 
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#2
09-25-2011, 09:41 AM
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I just heard a noise as you described too. Transmission?, transfercase? It sounds expensive to me....
__________________
06 x5 3.0 95 318ic gone, not forgotten 99 996 10 Ridgeline, gone 11 Ridgeline 03 z4 3.0
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#3
10-17-2011, 09:59 AM
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Im getting the same noise... Going crazy and losing a lot of $$$ trying to figure out the reason. 4-5 rapid knocks when coming out of 1st / 2nd gear then its gone... Please Please Please let me know what you learn from this.
PS: I was also informed that it may be the integral link. #4 http://www.realoem.com/bmw/showparts.do?model=FA53&mospid=47745&btnr=33_1029& hg=33&fg=30
__________________
 COUNT YOUR BLESSINGS! 
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#4
02-06-2012, 06:03 PM
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Well the problem turned out to be the transfer case chain slipping and jumping teeth. Apparently it had stretched enough for this to happen. this is a very heavy duty chain and takes a pounding from full throttle standing starts as you can imagine.
BMW's cure is a complete new transfer case at A$5000 as it's a non serviceable item. I bought a triplex chain from Automatic, Standard Transmission and Transfer Case Rebuild Kits, Cobra Transmission Parts 1-800-293-1848 in Florida for $300 and had my indie fit it. all up cost was $800.00. just be aware that splitting the casing open means very careful resealing during reassembly as there's no gaskets - just crosshatching on the metal to metal surface. get it wrong and it leaks. Incidentally, the same transfer case is used in Range Rovers and some Jeeps.
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