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6L80/L98 swapped car, constantly changing between 5th and 6th

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6L80/L98 swapped car, constantly changing between 5th and 6th

Tuning an old Buick with an L98/6L80e combo that constantly cycles between 5th and 6th at 100km/h. 

It happens in a very regular pattern.... roughly 10 seconds in 5th, then 10 seconds in 6th and so on....

No BCM fitted.

Speed sensor reads correctly.

I have made ALL shift tables the same, to eliminate any of those issues..

any ideas??

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