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ZF Automatic Transmission flush 1990 740 700 1990

Quick question or two;
Have you checked the fluid level using the "process" while the engine is running? (shift slowly from P to 1, then back to P)
Will it shift to 4th if you let up a little on the throttle?

Either one of those might suggest that your trans is just low on fluid. My 740t would act as you described, when I finally changed the fluid and filter it was still glitter free.

Also, the harder I drove it, the smoother it shifted as it got past 4k.






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