[littlemanjoe]

SECTION 11A: STOCK CARS, DRIVETRAIN: 2, TRANSMISSION, AUTOMATIC
(Page 7) (02/25/2025)
Any model transmission, same make as car, with a maximum of three forward speeds
(unless OEM equipped with more than three forward speeds). O.D. gear not required,
reverse permitted. Transmission case must be OEM or aftermarket OEM replica from a
standard, automotive application as found in the Official NHRA Stock Car Classification
Guide. Aftermarket case must meet SFI Spec. 4.1. NHRA-accepted adapter plates
permitted. Modifications to shifting patterns are permitted, provided full shift pattern is
retained. Full shift pattern must include park and reverse. Any gear change must occur
as a result of an internal function of the transmission or from direct action by the driver.
Lockup converter permitted if OEM-equipped with lockup converter and OEM
transmission is used. Otherwise, lockup converters prohibited. Electronic transmission
controls for the electric shifting of automatic transmissions to shift via internal function of
the valve body only permitted in computer-controlled vehicles only; may shift by RPM or
time only, wires for line lock, wheel speed, driveshaft speed or GPS signal prohibited.
Otherwise, any gear change must occur as a result of an internal function of the
transmission or from direct action by the driver. Pneumatic, electric, etc. controls in all
noncomputer-controlled electronic fuel-injected vehicles prohibited. The use of air
assisted or electric shifter is prohibited in all Stock applications.

Beginning January 1,
2026, RPM-activated pneumatic, electric shifters permitted. Deepened stock or
aftermarket transmission oil pans permitted. Drilling of transmission case or rear of
engine block to adapt incompatible units prohibited. Functional neutral safety switch
mandatory. Transmission brake prohibited. Tailshaft modifications for bushing
replacement, or NHRA-accepted aftermarket tailshaft, permitted. Any car running
quicker than 10.99 must be equipped with a transmission shield meeting SFI Spec 4.1