Jeep Nag1 transmission tuning issue.

[Crawlex]

Hey everyone,

I have a 2016 wrangler JK with an aftermarket motor and transmission swap. The drivetrain is a MOPAR crate 5.7 hemi paired with a NAG1, I have no idea if the shop that installed the motor did any tuning on the transmission or not...

The issue i am having is mostly in 4-lo, the engine revs to the moon before it shifts. So I began using the manual bump shift feature but the transmission wont allow me to bump shift over 3rd gear at all.

I don't know much about transmissions, and I did call a local shop but for what they wanted to do a custom tune I thought It might be worth trying to handle this myself.

Does this sound like an issue I might be able to handle with an HP tuner and help from this community?

Thanks!

[TransGo Robert]

For some reason the computer is not getting the signal that the transfer case is in low range.