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Message: <blockquote data-quote="e34_lover" data-source="post: 646114" data-attributes="member: 16259">Good idea! Definitely overlooked that part. Part number is 11111318185 if you and I are talking about the same thing. Price is not USD20 though. Its abit more. Clunking is because of the diff not the transmission. The SMG transmission and the manual transmission is exactly the same minus the actuators, pump and bell-housing. Every other part is the same. You can change your SMG gearbox to a manual one with the manual bell-housing. BMW issued a bulletin to the service departments telling them that this is normal and not to change any parts. ""E46 M3 - "Clunk Noise" on Load Reversal MODELE46 M3 with S54 engine SITUATIONCustomer may complain of a drivetrain rattle or knocking noise during a load change, e.g. 1st to 2nd gearshift at low engine speed, coming from the rear axle area. Further drivetrain checks reveal that the right side rear axle output flange appears to have more play (approximately 0.5mm to almost 1mm) when compared to the left side output flange. INFORMATIONThe radial play on the right side rear axle flange is a normal design characteristic of the new M differential lock style rear axle used on E46 M3 models. Therefore an M3 differential should not be replaced due to a difference in play (when comparing left to right side differential output flange play) since this will not eliminate a drivetrain rattle or knocking noise. IMPORTANTIn order to transmit engine torque to the rear wheels instantaneously, without any time lag, the whole M3 power train was designed with maximum torsional rigidity. Consequently, the flywheel mass and its damping capability has been reduced to a minimum. As a result, during an abrupt torque transfer (e.g. 1st to 2nd gearshift at low engine speeds) driver receives an acoustic feedback, which can be interpreted as a "clunking or rattling" noise. This characteristic is common in many high performance vehicles. Activation of the "Sport Mode" offers an additional increase in driving dynamics. As a result, acoustic feedback from the power train may be even more pronounced. The acoustic feedback characteristic is not a symptom of a failure, and does not compromise long-term reliability of drivetrain components (clutch, transmission, differential), nor does it adversely affect performance of the vehicle. WARRANTY INFORMATION"This clunk has left me in a dilemma whether I should install a 3.62 final drive or the whole M diff into my E36. I believe that you have a slight misunderstanding here. The car will gain power if the adjustment is so out that the valve is not seating properly. This will cause compression loss. On the other hand, if the gap is between the shim and camshaft is so large that the valves are not opening fully, less air is entering the combustion chamber (than normal) and less air is going out through the exhaust valves. This is where power is gained. More air = more power, less exhaust restriction (to a limit) = more power. When I talk about gaining power, its regaining horsepower not actually making more power than stock. There is no loss in power from a "tighter" engine because these shims only affect gap between the valves and the camshaft. There is no extra friction that would cause loss of power. The valve spring rates are still the same so the camshafts have to push the valve down with the same amount of force but just that they can now open fully. Agreed!!!</blockquote>

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