Line Lock - front or rear??

• Computer: Prohibited unless stock OEM equipment. See general regulations 9:1.
• Data Recorders: Prohibited. See general regulations 9:2 & 9:10.
• Delay Boxes: Prohibited.
• Transbrake: Prohibited.
• Line lock: Four-wheel line lock prohibited. Two-wheel line lock permitted on non-drive wheels only.
• Automated Shifter: Prohibited unless OEM equipped.
• Throttle Control: Throttle must be manually operated by the driver’s foot. Electronics, pneumatics, hydraulics or any other device may in no way affect the throttle operation. A deadstop under the carburetor or gas pedal is permitted. Throttle timers, counters prohibited.
• Ignition: Stutter boxes prohibited. Single stage (high side only) rev limiters permitted. Starting line rev limiter prohibited. Two or more step rev limiter prohibited, any other rpm limiting devices, legal unto themselves but altered or installed in so as to function as a down-track rpm controller prohibited. Crank trigger system prohibited, unless OEM distributorless ignition.
• Switches & Buttons: All switches and/or buttons must be NHRA accepted standard mechanical connection type. Infrared lasers, retinal scan, fingerprint, light source or other non-mechanical type switch prohibited.
• Tow vehicles: Prohibited.
• Exhaust: Muffler(s) required.

I found this for bracket cars. NHRA