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Flex disk replacement questions
Just completed a valve job and the car has a lot more power now. This has highlighted another issue - a hard "thunK" when shifting, especially into high gear. The result on shift is distinctly different depending on the situation:
1) Under moderate or heavy acceleration the shift is crisp but no big thunk is apparent. 2) Under very light acceleration, or if you are easing out of the throttle as the trans shifts (like in traffic) you get a BIG thunk from the rear area. 3) similar noise when trans is shifting down but thunk is not as apparent. 4) The noise does not seem to eminate from the front of the driveshaft (tail of the trans), it seems to be in the back near the differential. A few have advised me this is an indication of the need to replace the Flex disk(s). Do you usually need to replace front, rear, or both ? Another thing that has been suggested is differential mounts. If these are worn, would there be any other characteristics to look for? Car seems fine other than this hard "thunk" on shifting.
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Andy_M '98 W140 S320 Black/Black '06 W164 ML500 AMG White/Grey '03 Porsche 986 Midnight Blue/Grey ![]() |
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