Please email any and all technical and rule questions regarding any of the SWMMRA rules to tech@swmmra.org.
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| TIRES |
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33” maximum DOT tire ~ Sized by physical measurement. |
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Must be a mud tire (no straight tread tires). |
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No cutting or grooving. |
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No paddle tires. |
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| ENGINE |
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Gasoline only ~ No strokers allowed. |
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No blowers, alcohol or nitrous allowed. Specialty race fuels and E85 are allowed. |
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Must be factory OEM rotating assemblies including rods, pistons, crankshafts and their components. Must be corporate matching and available for that truck, that year. |
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Factory OEM ignition only. |
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No electric fuel pumps. |
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Maximum engine size, 368 cubic inches ~ No trans brakes. |
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No fuel injection OEM or AFTERMARKET. |
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Intake manifold must be OEM cast iron available for that make and year of truck, or an aluminum EDELBROCK PERFORMER low rise only. NO other brand names and no other makes of EDELBROCK. |
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Absolutely NO PORTING of heads or intake allowed. |
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Carb swaps allowed, vacuum secondary ~ single pump only. |
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Open headers allowed, bottom exit only. |
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Must run a steady 17 inches of engine manifold vacuum (minimum) at 800 RPM’s for 30 seconds. No vacuum pumps or equipment that will produce vacuum. |
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OEM stalls (not to exceed 1800 rpm’s). |
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Must have fan shroud. |
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Must have vacuum line routed to front or side of engine bay for easy access by tech personnel. |
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| BODY |
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Complete body required, corp. matching, make & model. |
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Rear seats & tailgate may be removed ~ No gutting hoods. |
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Must have 2 operable doors ~ Complete bumpers required. |
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Body and interior must be completely intact. |
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Head scoops allowed ~ Must be rear-facing ~ No isolation trays or plumbing allowed which isolate the air cleaner from the engine compartment or to the bottom of the hood. |
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Must have factory front bumper. Tube bumper allowed in the rear. |
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Tilt front hood allowed. No gutting of the hood. No removing the components from under the hood or the engine compartment. Hood must be operable. |
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| FRAME AND SUSPENSION |
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Total body and suspension lift not to exceed four (4) inches. |
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Must be factory suspension ~ Axle swaps allowed. |
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Must have factory OEM unmodified frame. |
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Must be factory transfer case for that year. |
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Driver must sit in stock location. |
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Tow hooks required, front and rear. |
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Must be corp. match transfer case. |
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Fuel cells allowed but factory tank must remain mounted in factory location. |
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Factory OEM suspension three full length leaf springs minimum allowed. |
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| SAFETY |
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Must meet all safety requirements. ~ Fire extinguisher. |
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Brake Locks Recommended on manual trans. Equip. Trucks. |