Mike - I've used the B&M, Transgo and now the TCI which along with their servo kit has been the best in a C4 for me. If you have had to drill the sheet metal divider in the control valve, you may not be able to use that one for another supplier's kit, C4 or AOD

This gadget:

TCI High Performance Servo Kits 523005 - SummitRacing.com , an AOD version is 10 bucks more

(Holy c@#p that gadget got expensive, I paid around $70)

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