Dirt Modifieds


A-Mod B-Mod Sport Mod
Typical HP 575 450 375
Typical Rear-End QC or 9” Ford 9” Ford 9” Ford
Typical Axle Lengths QC=30.50/30.50
9” Ford=28.50/32.50
All Gun-Drilled
9” Ford=28.50/32.50
All Gun-Drilled
9” Ford=28.50/32.50
Solid Axle by Rule
Forward Bite L=1.080” GD
R=1.110” GD
L=1.080” GD
R=1.100” GD
L=.940” Solid
R=.960” Solid
Most Throttle Turn
(bit loose on exit)
L=1.080” GD
R=1.145” GD
L=1.080” GD
R=1.145” GD
L=.940” Solid
R=1.130” Solid
Some Forward Bite
& Throttle Turn
L=1.080” GD
R=1.130” GD
L=1.080” GD
R=1.130” GD
L=.960” Solid
R=1.115” Solid

Best suited track type: Dry-Slick

Best suited track type: Heavy or Tacky

Best suited track type: Starts heavy or tacky getting more dry-slick through the night


Dirt Modified Axles IMCA


Before finalizing your axle diameter choices, please consider the following:
1) Review the information under the “Choose Your Axle Diameter” tab above (or click here) to get an idea of what the different axle diameter combinations will offer in terms of performance, and what you can expect from them.
2) Consider that; the wider the thickness gap (or diameter difference) between the left & right rear axles, the more throttle turn you will have on corner exit.
3) Every Strange Oval axle is made to twist, you will gain some forward drive regardless of what axle diameter you may choose, all of which are thinner than your normal standard diameter axles….There is no wrong choice!

Dirt Modified – Axle Diameter Quick Reference Guide:

IMCA A-Mod Axle Diameter Range:
LR:1.080”, 1.100”, 1.115”, 1.130”
RR:1.080”, 1.100”, 1.115”, 1.130”, 1.145”

IMCA B-Mod & Sport-Mod Axle Diameter Range: (SOLID AXLE By Rule)
LR:0.940” , 0.960” , 1.115”
RR: 0.960” , 1.115” , 1.130”

ISRA B-Mod Axle Diameter Range: (gun-drilled axles are allowed)
LR:1.080”, 1.100”, 1.115”
RR:1.080”, 1.100”, 1.115”, 1.130”

Additional information

Weight 10.0 lbs