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In Reply to: Re: transmission clunk posted by David Falkner on December 25, 2001 at 22:06:53:
1. Drain the fluid from the transmission pan (about four quarts)
2. Add three quarts of your favourite synthetic transmission fluid (Mobil 1) plus one quart of Trans X transmission cleaner.
3. Drive the car for 1000 miles then repeat steps 1 and 2 above.
4. Repeat step 3 for a total of 10 fluid changes.
5. On change 10, replace the transmission filter.
After 2 or 3 changes, you will notice that the transmission shifts are significantly smoother. I think that the cause of the problem is a partially restricted fluid passage or a sticking valve. The Trans X fluid seems to loosen up the restriction and free up the sticky valve.
Regards
Alex
My '89 735i does the same thing on the 2-3 shift but the 1-2 and 3-4 shifts are smooth. It doesn't always do it and it's frustrating. Anybody have a clue about this?
Thanks.
My 88 735i has a life long recurring trans prob. Rather than shifting smoothly, the car shifts with a clunk. This coincides with the gas mileage gauge failing. i.e. the needle wanders. It behaves exactly like a vacuum leak but I'm told that this is an electronic issue. The prob.
comes and goes sometimes in the same day. Does anyone know what part is failing and how I might prevent it from failing in the future?
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