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Yeah the Bluefire dongle seems to be a good option for basic monitoring. Note that for some strange reason they don't make it compatible with the 24v J1939 powered port on our trucks so you have to either modify your plug or add a second interface plug that's 12v so it doesn't damage their...

Well..... you can't. Not *legally* without paying for it anyway. And it's prohibitively expensive. The military has a somewhat reduced functionality version of CAT ET that doesn't require registration, etc but getting a copy typically involves offline methods due to size and potential for...

I woudn't think so - if the sensors are damaged the TCM is going to detect open/shorted circuit, or not see the RPM pulse. I can't envision a scenario where the sensor would read but at a shifted frequency resulting in inaccurate readings but not throw off the slip detection algorithm in the...

@MatthewWBailey - How sure are you of the accuracy of your tach? Isn't it running off the VR? Just trying to reconcile a seemingly functional truck, no codes present, and the stall test results. :unsure: CAT ET or any J1939 setup will read the tach from the ECM also.

Ideally - but it's locked in every gear except 1 and 2 - did they pick some absurd stall rating? Because mil-spec? IDK but if his trans was slipping I would think there would be codes stored.

What is the stall speed rating of the torque converter? I can hookup CAT ET to my truck and do a stall speed test. Stall speeds are not a hard number - they are subject to engine performance also. I know the TC has a 1.9:1 effective reduction when fully loaded (stalled)...... although I wouldn't...