PTO Output Shaft // Wildcat XX


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PTO Output Shaft // Wildcat XX

We have found that a vast majority of the cab noise if coming from the clutch area.  The primary source of the excess noise has been traced down to crankshaft PTO output shaft. This is a bolt-on part with internal splines that mate to external splines on the crankshaft, and the stock shaft has excessive tolerances that cause extra noise, vibration, and harmonics.  Our output shaft is a higher quality part built with tighter tolerances to cut down on the noise, and it reduces the vibrations and harmonics that lead to clutch button fatigue and failure. 

- Sound level reduction at shoulder level in the cab with the Speedwerx PTO shaft- 

1500 RPM:  -4dB or 37% reduction

2500 RPM:  -5dB or 44% reduction

4500 RPM:  -1dB or 11% reduction (wind noise has an effect on the dB meter at this speed)


- Speedwerx PTO Output Shaft Combined With Clutch Intake Kit-

1500 RPM: -5dB or 44% reduction

2500 RPM: -6dB or 50 % reduction

4500 RPM: -2 dB or 21% reduction (wind noise has an effect at this speed)


Note:  Sound Pressure Level as measured on an Electronic Decibel Meter is not a linear scale- 6db lower represents a 50% reduction in the sound pressure level. Likewise, a 6dB increase represents a 100% increase or doubling of the sound pressure level.

Our own ears perceive sound differently than an electronic decibel meter- in addition to the objective factor of sound pressure level as measured on a dB meter, subjective factors like the frequency or pitch, and duration or time of exposure to the sounds are part of what affect our perception of loudness. The number differences recorded on the dB meter may not look like a big change if you think in terms of a linear scale, and video recorded on a GoPro and played back on poor quality speakers on your phone or computer cannot accurately reproduce what you hear with your own ears, but in the video you can definitely hear a some of the change that makes it much more pleasant sounding in the cab with the new output shaft installed, and the hoses help reduce the overall sound level even further. The dB meter starts to pick up wind noise at the 10-12mph speeds seen around 4500rpm but it cannot sense the same changes in frequency or pitch that your ears can- it’s more easily heard in the GoPro videos at the slow crawling speeds where we also observe the larger differences on the dB meter, but there is still benefits to having these parts installed at higher speeds and RPM’s.


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These items are intended for closed-course competition only. Alternation of emissions-related components can constitute violation of federal and/or state laws. Substantial fines and penalties can result if used for other than closed-course competition use.