• Housing
  • Quick Change Rear Ends allowed...locked only (effective Jan 1 2017)
    (we reserve the right to refuse use of any rear end component with out reason)
    • All Trucks with a  quick change must use a chip-able MSD box
    • Claiming Rule: $2000
      • By any approved team owner or series.
        • Claiming owner must have competed in at least 70% of races in last calendar year.
    • Steel axle tubes only.
    • Quick change must use spool. (Locked rears only)
      • No torque dividing differentials
    • Must have bolt on rear cover.
    • Safety hubs (floater) allowed.
    • Steel solid axles only. No gun drilled.
    • Additional components
      • must be steel with the exception of
        • axle caps
        • one piece drive flange.
    • One inch inspection hole required in housings.
    • No cambered rear ends.
    • Distance from center of rear end housing to the rear hubs left and right must be within one inch in length
  • OEM rear ends must be stock steel
    (we reserve the right to refuse use of any rear end component with out reason)
    • Distance from center of rear end housing to the rear hubs left and right must be within one inch in length.
       
• OEM Ring and pinions
  • Any readily off the shelf available gears allowed
  • No custom ground or lightened gears
  • C-clip eliminators are optional
  • Welded spider gears or mini spool may be used if the original pin and carrier are maintained.
  • No ratchet, limited slip, torque bias, aluminum spool, or aluminum center sections permitted.
     
• Axels
  • Full floating rear axle permitted
  • Heavy duty aftermarket axles allowed
  • Steel only
  • May not be gun drilled
     
• Upper Control Arms
  • Adjustable upper control arms allowed
  • Must mount in stock mounting holes
  • Heim joints allowed
     
• Lower Control Arms
  • Adjustable lower control arms allowed
  • Must mount in stock mounting holes
  • Heim joints allowed
     
• Restrictive devices
  • No devices that limit or restrict rear suspension travel are allowed
  • Bump stops not allowed
  • Coil Spring binding not allowed
  • Chains to raise rear end are allowed
    • Must allow frame rail to raise 3 inches before rear tire is raised
       
• Gear Ratios  (Subject to change as needed)
  • A/B/C/D/S
    • Gear ratios and or Chip rule will be announced track to track.
    • Tracks 3/8 mile or smaller   the final drive cannot exceed 6.25
    • Tracks greater than 3/8mile and less then a mile final drive
      cannot exceed 5.25