6l90 into 2017 Regular Cab Silverado

[LTChuy]

Has anyone put a 6l90 instead of the 6l80 these trucks come with, was curious if it’s plug and play or? Also what can I do to beef up the 6l90 before putting it on, any info is appreciated

[CamGTP]

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.

[LTChuy]

Normally it would make sense to just go ahead and rebuild the 80 but I already had the 90 laying around so I guess the real question is could I just have the 90 flashed with my vin? 

[pokismoki]

if you go 6L90 is would look at the Isuzu NPR 4500 HD I don't belive it uses a TCC in the converter. mucho beefier and might have a forged billet tailshaft, I'm still collecting data on it

Edited August 31, 2021 by pokismoki