Having an issue with a T42/E38 combo in a VZ SS sedan A4 L76, just changed diff gears from 3.07 to 3.91, recalibrated in E38, using H0101, the speedo cal changes in the T42 tune had no effect so I left them stock. H0101 is now at 37812 up from around 28000. The speedo calculator takes into account H0104 which is not in the L76/e38 os. It appears the formula works for the LS1 os.

Anyway on the dyno the speedo stops working at 160km/h and shifts to OD prematurely, if I hold it in third it is fine, all shift points elsewhere fine.

Anyone seen this before?

cheers

Joel