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#1 |
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Join Date: Feb 2018
Location: West Layfayette
Posts: 125
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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 Last edited by littlemanjoe; 03-04-2025 at 09:06 PM. |
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#2 |
Senior Member
Join Date: Dec 2002
Posts: 916
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I used the Turbo Action E shift in my LS1 stocker 25 years ago. Made the 1 - 2 shift perfect every time. I think NHRA did this so everyone would have the same level racing world. The pre 97 cars never had the advantage of this. Use it if you want, don't if you want. Dyno
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