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Air intrusion is easy enough to look for. disconnect the return line at the tank and connect it to a clear hose and run it into the filler pipe. Then you can see any air. Does your primer bulb get firm at all? I did this video up A while back and just uploaded it to youtube last week. I...

Yea, thats the one in the transfer case. I believe it is where vehicle speed is derived. I believe all the other sensors in the trans are used strictly for trans control...

OK, sounds like you are all over it:) Either you are severely HP limited as Coachgeo alluded to, or your governor is limiting your peak engine RPM. You need to tach the engine. Some digital voltmeters will read frequency. With one of these you could read the engine RPM sensor output either at...

Superman where exactly is the sensor on the bottom of the trans? Got a P/N? Allison was a little confusing in their labeling of sensors in the trans. They called them speed sensors when it would have been more appropriate IMO to call them RPM sensors. in the trans would be a goofey place to...

The CTIS controller provides the overspeed light voltage directly to the panel light, so if the light is on it is the CTIS controller causing it. Is your speedometer working/accurate? The CTIS controller shares the speed input from the transmission controller with the speedometer. Below a...