Strength in Bending
Note: Values greater than one indicate an improvement in bending strength. For example, the stock housing
with a sleeve is 1.35 times as strong when compared to the stock housing without a sleeve.
Stock JK Axle 2.5” OD x 0.25” = 1.0
Stock JK Axle with 2.0" OD x 0.25" sleeve on inside of tube = 1.35
Dynatrac JK Trail Series – Stock JK Pumpkin with re-tube to 2.75" OD x 0.375" = 1.79
Dynatrac ProRock 44 Standard Axle Tube 3.0" OD x 0.3125" = 2.13
Dynatrac ProRock 44 Extreme Duty Axle Tube 3.0" OD x 0.5" = 2.82
Weight
Note: Values greater than one correspond to an increase in weight. The ratios below show that the sleeve is
one of the heaviest options.
Stock JK Axle 2.5” OD x 0.25” = 1.0
Stock JK Axle with 2.0" OD x 0.25" sleeve on inside = 1.78
Dynatrac JK Trail Series Axle Housing Tube 2.75" OD x 0.375" = 1.58
Dynatrac ProRock 44 Standard Axle Tube 3.0" OD x 0.3125" = 1.49
Dynatrac ProRock 44 Extreme Duty Axle Tube 3.0" OD x 0.5" = 2.22
Strength Per Pound Ratio
Note: This metric compares the strength improvement to the weight increase. Obviously, adding strength will
add weight, however, not every pound added leads to the same improvement in strength. Strength is a
combination of material properties and geometry in this case. Adding material to the outside of the axle tube
will result in a greater improvement of strength for the same weight of material added.
Stock JK = 1.0
Stock JK with sleeve = 0.76
Dynatrac Trail Series JK Axle = 1.13
Dynatrac ProRock 44 Standard Axle Tube = 1.43
Dynatrac ProRock 44 Extreme Duty Axle Tube = 1.27