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- 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
- 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
- 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)
- Gear ratios and /or Chip rule may be announced track to trackwithout notice.
- Specific race gear rules not listed here will be on the entry blank
- Tracks 3/8 mile or smaller the final drive cannot exceed 6.25
- Tracks greater than 3/8 mile and less then a mile final drive
cannot exceed 5.25
- NHIS 3.73 Max Final Drive unless listed different on entry blank
