Converter Slipping?

Next time you make a hard run on the highway in OD with converter locked, try to see exactly what RPM equates to 65MPH or 70MPH. You can enter your rear-end gear ratio into the MPH vs RPM calculator and see exactly where the RPM should be at 65MPH or 70MPH. If something is slipping, obviously you'll see higher RPM than the calculated RPM.

My calculation shows your non-corrected speedometer should show 80 MPH at 2500 RPM.

Or you can check at a slower speed, 65 MPH should be really close to 2000 RPM. If you're seeing 2100 RPM at 60MPH or 2600 RPM at 80MPH, you definitely have slippage in either the tranny or the torque converter.
 
thanks a lot. I took a drive with one of my buddies that has a cummins that makes 665hp/1200+TQ and he said it is nothing to worry about. I will try that next time i am on the highway.
 
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