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Big Tex - If your motor is running properly, with correct fuel delivery, the pump adjustments listed in this thread will make a big improvement. My 923A2 has the full rack travel turned all the way out, and a few turns of pre-boost fuel added as well. The truck moves pretty well, and not...

For those of you who have installed new GSK's, have you considered using a better harmonic balancer? Only reason is that I remember seeing notes in the parts catalog that the OEM balancer was for 2100 RPM or lower.

CSM Davis - You are correct about the intake caps. I removed what I thought was a different design to find it was only an additional screen as you described. Thanks for setting me straight. Took the truck for a quick ride with the cap removed. No more sucking sound through the screen...

The intake piping and air filter canister look like they should flow pretty well. What would an acceptable pressure (vac) reading be post filter, before compressor inlet?

I turned up the full fuel / rack travel with good results. I noticed the sound of air rushing through the mushroom cap intake screen on my m923A2 when the motor was wound up under load. There is not a lot of surface area for the air to enter. My 931A2 tractor has a different shape inlet cap...