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6l90 into 2017 Regular Cab Silverado


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It's not plug and play. The TCM inside the 6L90e is not programmed to your computer, so it wouldn't ever work.

 

Just build the 6L80e, put in a better torque converter and tune the transmission. It will handle a lot of power.

 

You'd be doing the same things to the 6L90e, adding better clutches and parts and a new torque converter.

 

If you decide to get a different used 6L80e to build or a new unit, both would need to be flashed with a GM tool with your VIN and matching operating systems so both the PCM and TCM jive together.

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