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The first thing to remember is that you are driving a truck and not a sports car. The best way to describe it is that once the vehicle had reached operating temperature you accelerate at full throttle until you reach your desired speed. If you are not at full throttle the transmission can and...

Based on this the transmission should be shifting at 1850 for all but the last gear and the last shift should be at 1650

To change the piston you have to remove the trans and disassemble it. If you remove the trans, do not separate it from the torque converter. What is your no load governed rpm? You need to know this in order to correctly drive an allison equipped truck. There are two problems with a lot of...

I have been told that the MT654CR is considered an obsolete transmission by Allison so some of the information about this transmission is not available on the internet like the MT643 and MT653. Once an Allison is locked it should stay locked in those gears. It should not be unlocking by it own...

Have you read the Allison operators manual? The Allison is not like your car automatic. There is a lot of adjustment on these trans but they are best adjusted on the dyno. Do you feel an extra shift where the RPM's only drop about 200? This should be in 4 the gear, if my memory is correct...