Nag1 Performace TCM Service

NAG1 Performance TCM Flash Service (W5A580 Transmission)

Unlock the full potential of your NAG1 / W5A580 5-speed automatic transmission with N2 Speed’s Performance TCM Flash. The factory transmission calibration is designed for comfort, fuel economy, and broad driver behavior — not for cammed engines, aggressive driving, increased horsepower, or track use. Our custom calibration optimizes shift strategy, torque management, and clutch application to properly support modified Dodge, Chrysler, Jeep, and RAM platforms.

This service is especially beneficial for vehicles with cams, superchargers, headers, gear changes, larger tires, or increased engine torque, where the stock TCM calibration becomes the limiting factor in drivability and performance.

What the N2 Speed Performance TCM Tune Changes

Shift Timing & Speed

• Faster, more decisive gear changes

• Eliminates lazy or drawn-out shifts

• Reduces RPM flare between gears

• Better part-throttle and wide-open-throttle shift response

Torque Management Recalibration

• Removes excessive torque reduction during shifts

• Works correctly with custom PCM tuning

• Prevents throttle closures and power drop during gear changes

Shift Scheduling

• Revised WOT shift RPM

• Correct gear holding under acceleration

• Improved downshift behavior when passing

• Eliminates gear hunting at cruise speeds

Manual / Autostick Mode Improvements

• Faster paddle and shifter response

• Holds selected gear longer

• Removes early forced upshifts

• Much more driver control

Common Problems This Fixes

• Slipping or soft 2-3 / 3-4 shifts after engine modifications

• Transmission “fighting” a performance PCM tune

• Delayed engagement

• Gear hunting at steady throttle

• Rev hang during acceleration

• Poor drivability after installing a supercharger

Supported Vehicles

• Dodge Charger (2006–2014)

• Dodge Challenger (2008–2014)

• Chrysler 300 / 300C

• Jeep Grand Cherokee 5.7 / SRT8 (WK)

• Dodge Magnum

• RAM 1500 (5.7L equipped with NAG1)

(If your vehicle uses the 5-speed W5A580/NAG1, this service applies.)

How the Service Works

1. You ship your TCM to N2 Speed.

2. We read and modify the calibration

3. Custom performance file is written to the module

4. The TCM is returned plug-and-play — no dealer programming required

No VIN relearn or additional setup is needed. Simply install and drive.

Why a TCM Tune Matters

Many customers install a PCM performance tune but leave the transmission stock. The NAG1 transmission is heavily torque-managed from the factory, meaning the TCM actually overrides engine power during shifts. Without recalibrating it, the engine tune cannot deliver its full performance — and in some cases causes clutch wear.

A properly calibrated TCM:

• Protects the transmission

• Makes power feel instant

• Dramatically improves drivability

• Makes the car feel lighter and more responsive

This is one of the most noticeable upgrades you can make to a modified HEMI vehicle.

Professional calibration developed specifically for HEMI performance applications — street, strip, and boosted builds.
Pair this with an N2 Speed PCM custom tune for the best overall results.