No Slipper eliminator is allowed.
BIG BLOCK MUDBOSS
BODIES (SalvasMUDboss)
1.1 1.2 1.3 1.3.1 1.4 - Any minor modification to the MUDboss body must be approved before being allowed
- It is allowed to ‘brace’ the rear traxxas body post mount for more rigidity (can use 2 extra screws only) and ‘brace’ the front portion of
body posts. Front brace can be mounted on chassis or directly bolted on front portion of innerpanel ( https://tinyurl.com/26hjcd2y )
- The optional ‘NEXTGEN’ innerpanel is allowed and must be installed following the procedures posted on facebook/youtube
( https://tinyurl.com/3yjzashs )
- The 2025 NEXTGEN innerpanel must use MUDboss body rear spoiler and have minimum height of 5.5 inches (chassis on ground)
- Traxxas clipless REAR support brace (6940-6967) can be used. Must be installed centered to actual holes in body.
CHASSIS
2.1 - (*) (TRAXXAS HCG 2wd SLASH 12t or BL2S / TRAXXAS MODIFIED-LATE MODEL BL2S / TRAXXAS 2wd VX3 SLASH) ALL
parts from these RTR kits are allowed (unless specified in the following rules)
2.1.1 - (*) ALL OEM components included in previous TRAXXAS chassis kits are allowed, unless specifically notified in the rules
2.2 - Original MFG suspension parts only, no other parts allowed (such as from RPM)
2.3 - Original MFG chassis parts only, no aftermarket hop-ups, no optional aluminium parts
2.4 - Front bumper, right side bumper and front body post brace must be removed
2.4.1 - Left side and rear bumpers can also be removed (if desired) **rear RPM bumper is allowed**
2.5 - TRAXXAS front optional bumper (TRA2735) can be used (angled down)
2.6 - Major alterations to the chassis or modification to drivetrain/suspension components is not allowed
2.7 - Electronics (rx/esc/amb) must be installed within chassis surface (no outside installation)
2.8 - Battery brace can be trimmed to allow different LiPo battery wire configuration
ELECTRONICS
3.1 - (*) Original TRAXXAS 2075 and 2057 servos are allowed
3.2 - TRAXXAS 2075x and 2075r (servos) AND TRAXXAS 2072x (gear set) are allowed as ‘alternative’ parts/servos
3.2.1 - The SAVOX SC-0252MG and SC-0252MGP Digital Servo are allowed, these are an ‘alternative’ servo
3.2.2 - SAVOX gear set (SAVSGSC0251MG) can be used to ‘upgrade’ the TRAXXAS 2075 to metal gears
3.3 - it is allowed to 'pin' the servo saver(white) or bell crank(black)...be advised the 2075 servo gears might get broken under a heavy crash
3.3.1 - original TRAXXAS plastic servo saver/bell crank only (3743 white or 6845X black system) it is allowed to mix the components
(ie.. using black servo horn with white bell crank)
3.3.2 - It is allowed to use a solid (one piece) servo horn (any brand) AND use any servo steering rod (adjustable link ok)
3.4 - 2-cell 7.4v LiPo battery with a maximum of 5200mah and 50c, with external plug only 350 gr max
ADJUSTMENTS
4.1 - (*) TRAXXAS 32p(54-56) and 48p(76-83-86-90) SLASH spur with all transmission parts in place (slipper) , any pinion size
(unless noted in specific class rules)
4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 - Any original Traxxas Slash bearings can be replaced by any type of bearings
4.2.1 - Original bellcrank white plastic bushings CAN be replaced by bearings
- No modifications can be made to the transmission’s case (ie.. to allow a bigger gear ratio)
- The gear cover must be off at all times to allow for visual inspection (CARPET)...and removed if asked (DIRT)
- The only adjustments allowed to the car are those allowed by the original MFG components of the car
- You are allowed to use any original wheel spacer combination (Black, Grey or any combination of both types)
- Transmission functionality rule (motor can not spin while turning slowly one rear wheel a full turn)
- Traxxas SLASH *STEEL* transmission gears only (no modification allowed) (internal plastic transmission gears not allowed)
4.8.1 - (*) MAGNUM 272R transmission or parts ARE allowed, parts 9480A, 9494, 9492 are allowed (272R transmission must remain OEM)
- Adding weight (in any way) is not allowed, wheel balancing is allowed (sole purpose of balancing, not to add weight)
SUSPENSION
5.1 5.2 - (*) TRAXXAS 2WD shocks from kits mentioned in rule 2.1 are allowed (front shocks in front, rears in rear)
- for small OD clip type shocks, Original Rear (TRAXXAS 5858) and Front springs (TRAXXAS 5857) (no LCG kit springs or
aftermarket springs)
5.2.1 - Front springs on small OD clip type shocks may be cut in order to shorten them (no more than 5 round removed on ONE end)
5.3 - (*) if using GTR type shocks, 7461(x) fronts or 7462(x) rears, alternate springs can be used (“SHORT” in front, “XX LONG” in rear)
only these springs can be used in MUDboss with GTR shocks (TRAXXAS 7474-75-76 in front, TRAXXAS 7442-43-46-47-49 in
rear)(NO cutting or modifications allowed on these springs)
5.3.1 - (*) Traxxas white color coded springs specified in rule 5.3 for GTR shocks need to remain white with color codes clearly visible
5.3.2 - Springs that are included in TRAXXAS Modified or Late Model kits are NOT LEGAL (only previously specified springs are legal)
5.4 - The shock’s travel may be shortened with internal shims (ie..fuel tube or solid shims...)
5.5 - Original shafts in original cylinder (length and type in proper cylinder)
5.6 - Original pistons from kits only, no modifications can be made to them
5.7 - No front bump stop suspension, a single original blue bump stop can be used per rear shock (not mandatory)
5.8 - No shimming allowed (to reduce slop in suspension parts)
5.9 - All suspension parts (such as A-Arms) must remain in original positions it was designed for (no swapping left to right)
DIRT OVAL (BIG BLOCK CLASS) SPECIFIC RULES
8.1 8.2 8.3 8.4 8.5 8.6 - (*) chassis kits from TRAXXAS mentioned in rule 2.1 are allowed
- 2 tire type allowed(no mix)PROLINE #10153-02/03(HOOSIER)AND #10231-03/17(HOTLAP)(oem blue inserts and any SC wheel)
- Tire surface must show “thread Pattern” (no slick tires)
- Race Track may allow tire traction additives
- (*) any ESC in BLINKY mode (ROAR software approved) (ESC must use capacitors configuration it came with)
- ROAR legal 13.5 sensored brushless motor (Stock 13.5/Spec) (approval date is set to September 1st 2026)
http://roarracing.com/approvals/print_brushlessmotors.php
8.6.1 - (*) TRAXXAS BL-2S and VX3 combo brushless systems can be also used (NO MODS ALLOWED TO BL-2S or VX3, MUST REMAIN OEM)
8.7 8.8 - a single 30mm motor fan can be used
- all other rules specified earlier in sections 1-2-3-4-5 stays the same
BODIES (SalvasMUDboss)
1.1 1.2 1.3 1.3.1 1.4 - Any minor modification to the MUDboss body must be approved before being allowed
- It is allowed to ‘brace’ the rear traxxas body post mount for more rigidity (can use 2 extra screws only) and ‘brace’ the front portion of
body posts. Front brace can be mounted on chassis or directly bolted on front portion of innerpanel ( https://tinyurl.com/26hjcd2y )
- The optional ‘NEXTGEN’ innerpanel is allowed and must be installed following the procedures posted on facebook/youtube
( https://tinyurl.com/3yjzashs )
- The 2025 NEXTGEN innerpanel must use MUDboss body rear spoiler and have minimum height of 5.5 inches (chassis on ground)
- Traxxas clipless REAR support brace (6940-6967) can be used. Must be installed centered to actual holes in body.
CHASSIS
2.1 - (*) (TRAXXAS HCG 2wd SLASH 12t or BL2S / TRAXXAS MODIFIED-LATE MODEL BL2S / TRAXXAS 2wd VX3 SLASH) ALL
parts from these RTR kits are allowed (unless specified in the following rules)
2.1.1 - (*) ALL OEM components included in previous TRAXXAS chassis kits are allowed, unless specifically notified in the rules
2.2 - Original MFG suspension parts only, no other parts allowed (such as from RPM)
2.3 - Original MFG chassis parts only, no aftermarket hop-ups, no optional aluminium parts
2.4 - Front bumper, right side bumper and front body post brace must be removed
2.4.1 - Left side and rear bumpers can also be removed (if desired) **rear RPM bumper is allowed**
2.5 - TRAXXAS front optional bumper (TRA2735) can be used (angled down)
2.6 - Major alterations to the chassis or modification to drivetrain/suspension components is not allowed
2.7 - Electronics (rx/esc/amb) must be installed within chassis surface (no outside installation)
2.8 - Battery brace can be trimmed to allow different LiPo battery wire configuration
ELECTRONICS
3.1 - (*) Original TRAXXAS 2075 and 2057 servos are allowed
3.2 - TRAXXAS 2075x and 2075r (servos) AND TRAXXAS 2072x (gear set) are allowed as ‘alternative’ parts/servos
3.2.1 - The SAVOX SC-0252MG and SC-0252MGP Digital Servo are allowed, these are an ‘alternative’ servo
3.2.2 - SAVOX gear set (SAVSGSC0251MG) can be used to ‘upgrade’ the TRAXXAS 2075 to metal gears
3.3 - it is allowed to 'pin' the servo saver(white) or bell crank(black)...be advised the 2075 servo gears might get broken under a heavy crash
3.3.1 - original TRAXXAS plastic servo saver/bell crank only (3743 white or 6845X black system) it is allowed to mix the components
(ie.. using black servo horn with white bell crank)
3.3.2 - It is allowed to use a solid (one piece) servo horn (any brand) AND use any servo steering rod (adjustable link ok)
3.4 - 2-cell 7.4v LiPo battery with a maximum of 5200mah and 50c, with external plug only 350 gr max
ADJUSTMENTS
4.1 - (*) TRAXXAS 32p(54-56) and 48p(76-83-86-90) SLASH spur with all transmission parts in place (slipper) , any pinion size
(unless noted in specific class rules)
4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 - Any original Traxxas Slash bearings can be replaced by any type of bearings
4.2.1 - Original bellcrank white plastic bushings CAN be replaced by bearings
- No modifications can be made to the transmission’s case (ie.. to allow a bigger gear ratio)
- The gear cover must be off at all times to allow for visual inspection (CARPET)...and removed if asked (DIRT)
- The only adjustments allowed to the car are those allowed by the original MFG components of the car
- You are allowed to use any original wheel spacer combination (Black, Grey or any combination of both types)
- Transmission functionality rule (motor can not spin while turning slowly one rear wheel a full turn)
- Traxxas SLASH *STEEL* transmission gears only (no modification allowed) (internal plastic transmission gears not allowed)
4.8.1 - (*) MAGNUM 272R transmission or parts ARE allowed, parts 9480A, 9494, 9492 are allowed (272R transmission must remain OEM)
- Adding weight (in any way) is not allowed, wheel balancing is allowed (sole purpose of balancing, not to add weight)
SUSPENSION
5.1 5.2 - (*) TRAXXAS 2WD shocks from kits mentioned in rule 2.1 are allowed (front shocks in front, rears in rear)
- for small OD clip type shocks, Original Rear (TRAXXAS 5858) and Front springs (TRAXXAS 5857) (no LCG kit springs or
aftermarket springs)
5.2.1 - Front springs on small OD clip type shocks may be cut in order to shorten them (no more than 5 round removed on ONE end)
5.3 - (*) if using GTR type shocks, 7461(x) fronts or 7462(x) rears, alternate springs can be used (“SHORT” in front, “XX LONG” in rear)
only these springs can be used in MUDboss with GTR shocks (TRAXXAS 7474-75-76 in front, TRAXXAS 7442-43-46-47-49 in
rear)(NO cutting or modifications allowed on these springs)
5.3.1 - (*) Traxxas white color coded springs specified in rule 5.3 for GTR shocks need to remain white with color codes clearly visible
5.3.2 - Springs that are included in TRAXXAS Modified or Late Model kits are NOT LEGAL (only previously specified springs are legal)
5.4 - The shock’s travel may be shortened with internal shims (ie..fuel tube or solid shims...)
5.5 - Original shafts in original cylinder (length and type in proper cylinder)
5.6 - Original pistons from kits only, no modifications can be made to them
5.7 - No front bump stop suspension, a single original blue bump stop can be used per rear shock (not mandatory)
5.8 - No shimming allowed (to reduce slop in suspension parts)
5.9 - All suspension parts (such as A-Arms) must remain in original positions it was designed for (no swapping left to right)
DIRT OVAL (SPORTSMAN CLASS) SPECIFIC RULES
7.1 7.2 - (*) chassis kits from TRAXXAS mentioned in rule 2.1 are allowed
- any original TRAXXAS SLASH rubber tire/wheel/inserts (BFG / KUMHO / SPEC) any wheel combination of the SAME TIRE TYPE
(ie..4 fronts, 4 rears, 3 front 1 rear…) *“S1” compound ALLOWED where tracks allow tire additives*
7.3 - Race Track may allow tire traction additives
7.4 - Tire surface must show “thread Pattern” (no slick tires on any portion of it)
7.4.1 - You may use a bead of “CA” type glue or ‘’tape’’ to the RIGHT FRONT tire side wall to reduce the car’s aggressiveness
7.5 - (*) TRAXXAS XL5 12t brushed motor / BL2S combo / VX3 combo. ALL these can be used as motor/esc combo (not allowed to mix
any combo) (NO PHYSICAL MODS ALLOWED TO MOTOR, MUST REMAIN AS OEM)
7.5.1 - (*) a LOW FIXED gear ratio (for 32 and 48 pitch) with these different motor/esc combos must be set so similar performance be achieved
(to be set individually for each combos by racetracks)
7.6 - all other rules specified earlier in sections 1-2-3-4-5 stays the same
"SPONSORED MEANS YOU RECEIVED ANY DISCOUNT OR HELP FROM ANY COMPANIES, CHAISSIS,BODIES,ELECTRONICS,TIRES ECT"
This class is a Ready To Run Box Stock Class. You must run the kit as it comes out of the box and this includes the radio. No Upgrades at all.
Shock Oil, Pinion Gear, Diff fluid. Additional front body mounting such as velcro, extra body post to secure nose of body is allowed.
"SPONSORED MEANS YOU RECEIVED ANY DISCOUNT OR HELP FROM ANY COMPANIES, CHAISSIS,BODIES,ELECTRONICS,TIRES ECT"
This class is a Ready To Run Box Stock Class. You must run the kit as it comes out of the box and this includes the radio.
Shock Oil, Pinion Gear, Diff fluid.
"SPONSORED MEANS YOU RECEIVED ANY DISCOUNT OR HELP FROM ANY COMPANIES, CHAISSIS,BODIES,ELECTRONICS,TIRES ECT"
LOSI LATE MODEL RTR
RTR ONLY
Car has to be ran the way it came in the box.
No carbon fiber anything.
No aluminum upgrades.
Stock servo and esc.
Stock tires and wheels.
Stock springs in stock locations. Orange rear. Purple in front. Colors has to be visible.
Stock 84 tooth spur gear
Losi Latemodel body only. Stock or clear body with your personal wrap design or custom painted is allowed.No other bodies allowed.
Only changes allowed will be shock oils, gear diff fluid, radio, can change ball cups to the TLR heavy duty cups only, and pinion gear.
No modifications to chassis, motor plate, body, spoiler or spoiler caps.
No cage pieces can be removed such as bars, driver compartment, or body braces.
Body can not be bent, folded or modified in any way to direct air.
No additional weight allowed.
Any 2s hard case battery with any battery ends. Bullet ends are ok.
Stock hexes only. No aftermarket aluminum ones allowed.
You can punch holes in tire and or wheel.
You can have your own wrap installed.
Latemodel wheels only. No sprint wheels allowed.
You can run soft or super soft Losi tires.
BATTERY:
2 Cell HARD CASE Lipos. Do not need to be ROAR approved. 8.40 max voltage at Tech Inspection. If 8.45 or highter, you will not be allowed to race that round.
NO GYRO OR DRIVING DEVICES ALLOWED IN ANY CLASS.
TIRES: WHITZ WIDE OPEN

FRONT - #WRP-WD-F-SS (Super Soft) #WRP-WD-F-S (Front Soft), #WRP-WD-F-M (Front Medium) MUST USE INCLUDED INSERTS

REAR- #WRP-WD-R-SS (Super Soft) #WRP-WD-R-S (Soft Rear), #WRP-WD-R-M (Medium Rear) MUST USE INCLUDED INSERTS
SIDEWALL STIFFNERS ARE NOT ALLOWED
DODC RULES APPLY- CLICK HERE TO GO TO DIRT OVAL.COM FOR RULES
BATTERY:
2 Cell HARD CASE Lipos. Do not need to be ROAR approved. 8.40 max voltage at Tech Inspection. If 8.45 or highter, you will not be allowed to race that round.
MOTOR and ESC:
13.5 ROAR APPROVED "SPEC" MOTOR
ROAR APPROVED ESC in BLINKY MODE.
NO GYRO OR DRIVING DEVICE ALLOWED IN ANY CLASS.
TIRES: WHITZ WIDE OPEN- You are allowed to use any of the compounds listed below.
*** SIDEWALL STIFFNERS ARE NOT ALLOWED ***

FRONT - #WRP-WD-F-SS (Super Soft) #WRP-WD-F-S (Front Soft), #WRP-WD-F-M (Front Medium) MUST USE INCLUDED INSERTS

REAR- #WRP-WD-R-SS (Super Soft) #WRP-WD-R-S (Soft Rear), #WRP-WD-R-M (Medium Rear) MUST USE INCLUDED INSERTS
SIDEWALL STIFFNERS ARE NOT ALLOWED