For those who may not have seen this....I guess the GM stock locking type is not approved...
NHRA Accepted Products
Locking Type Dipsticks (Auto Trans)
Manufacturer Phone Number Website
A-1 Performance 360-574-9966
www.a-1perf.com
ATI 877-298-5039
www.atiracing.com
B & M 818-882-6422
www.bmracing.com
BTE 800-626-1828
www.bteracing.com
Coan Racing 765-456-3957
www.coanracing.com
Cope Racing Transmissions 219-374-0100
www.coperacingtrans.com
Hughes Performance 602-257-9591
www.hughesperformance.com
Lokar 877-469-7440
www.lokar.com
Mike's Transmission 661-723-0081
www.mikestransmission.com
Performance Automatic 301-963-8078
www.performanceautomatic.com
TCI Auto 888-776-9824
www.tciauto.com
Trans Dapt Performance 562-921-0404
www.tdperformance.com
Transmission Specialties 610-485-9110
www.transmission-specialties.com