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Arrington Performance HEMI NAG1 Stage I - Modified Valve Body LX / Challenger

Weight:20.0 lbs
Installation Skill Rating:
Arrington Performance
Base Price: $850.00
Price with Options: $850.00

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Arrington Stage I Valve Body 

Let your HEMI transmission preform the way it should of straight from the factory. Arrington Performance NAG1 Stage I Valve Body allows your HEMI transmission, on your LX or Challenger, to shift firmer and quicker. Not only will the Arrington Valve Body upgrade remove shift lag, speed up shifts, and give your vehicle a sporty feel, but it will also increase clutch life. After you upgrade to a Stage 1 valve you will notice a that the more aggressively you drive, the firmer the shifts will engage. Since downshifts firmer than stock car will be more responsive when accelerating. Yet, during normal driving the unit lets the transmission engage smoothly. 

Core Charge

A $400 Refundable Core charge is required (no core charge if installed at Arrington).

  • The Stage I modified valve body increases shift pressures
  • More aggressive driving gives you a Firmer Shift
  • Firm but not harsh downshifts
  • The downshifts are firmer than stock, but not to the point of being too harsh.
  • Quicker and Harder Shifts 
  • Increases clutch life
  • Preform the way it should of from the factory
  • Removes shift lag
  • Sports car enthusiasts that want to feel the shift
  • Full One Year Warranty - No matter the power applied!
  • Stage I Valve body
  • Dodge Challenger 5.7L & 6.1L LC 2008 to 2010 (Up to 450 RWHP)
  • Chrysler 300 5.7L & 6.1L LX 2005 to 2010 (Up to 450 RWHP)
  • Dodge Charger 5.7L & 6.1L LX 2006 to 2010 (Up to 450 RWHP)
  • Dodge Magnum 5.7L & 6.1L LX 2005 to 2010 (Up to 450 RWHP)
  • Jeep SRT8 6.1L 2006-2010 (Up to 400 AWDHP)
What Is A Valve Body?

The valve body is the control center of the automatic transmission. It contains a maze of channels and passages that direct hydraulic fluid to the numerous valves which then activate the appropriate clutch pack or band servo to smoothly shift to the appropriate gear for each driving situation. Each of the many valves in the valve body has a specific purpose and is named for that function. For example the 2-3 shift valve activates the 2nd gear to 3rd gear up-shift or the 3-2 shift timing valve which determines when a downshift should occur.The most important valve, and the one that you have direct control over is the manual valve. The manual valve is directly connected to the gear shift handle and covers and uncovers various passages depending on what position the gear shift is placed in. When you place the gear shift in Drive, for instance, the manual valve directs fluid to the clutch pack(s) that activates 1st gear. It also sets up to monitor vehicle speed and throttle position so that it can determine the optimal time and the force for the 1 - 2 shift. On computer controlled transmissions, you will also have electrical solenoids that are mounted in the valve body to direct fluid to the appropriate clutch packs or bands under computer control to more precisely control shift points.

Arrington Performance Stage I Valve Body Install Guide
Dodge, Chrysler, or Jeep NAG1 Valve Body Removal:

1. Move selector lever to position park

2. Raise vehicle.

3. To disconnect 13-pin plug connector (1)

(a). Rotate the bayonet lock of the adapter plug (2) counter-clockwise.



4. Using a 7mm socket, loosen the adapter plug bolt (9) and remove from the adapter plug (10) from the transmission housing. The 2 Black O-rings should be on this adapter. Many times one of the O-rings will stick in the valve body. Remove it and install it back on the plastic adapter piece.

5. Detach oil pan (5).

6. Remove oil filter (4).


7. Unscrew 10 Torx socket bolts (3) and remove valve body.


Swap Top Electrical Connector Plate on NAG1 Valve Body:

8. Remove the 3 small bolts & retainers that hold the solenoids down. Note one bolt is shorter.

9. Remove solenoids...noting locations.

10. The solenoid at the bottom left (converter solenoid) sometimes needs a bit of wiggling to remove.


Unsnapping the electrical connector plate (dipstick side)

11. On the electrical connector side, push the plastic tab toward the long plastic dip stick guide. The plastic pin will pop right out of the steel plate.


Unsnapping the electrical connector plate (slide piston side):

12. Rotate the temperature sensor SLIGHTLY counterclockwise to release the tab from the steel plate.

If your electrical connector looks like this on the underside of the electrical connector plate, your NAG1 is in BAD shape. Valve_Body_Install_image5101

13. Reverse procedure to install the electrical plate.

14. It will simply clip into position.

15. Re-install the solenoids. Reference above photo for locations, actually they can not be installed in the incorrect position, they won't fit.

16. To install Use the same torque (71 in. lbs.) as all the other torx bolts.

HEMI NAG1 Valve Body Install:

1. Position the valve body in the transmission.

2. Insert selector valve (1) in driver of detent plate (2).

3. Reread #2

4. When installing the valve body in the transmission, the plastic part of the selector valve (1) must engage in the driver of the detent plate (2).
5. Install the Trox socket bolts (3) and torque to 71 in lbs (NOT FOOT LBS).

6. Install a new oil filter (4).

7. Install oil pan (5) and torque the pan bolts to 71 in lbs (NOT FOOT LBS).

8. Install the adapter plug (10) into the transmission housing and just SNUG the tiny bolt with a 7mm socket.

9. Check the two O-rings on plug connector (1). They must be BLACK or they will leak.

10. Replace O-rings and connector if necessary from the dealer.

11. Install the plug connector (8) into the adapter plug (10). Turn bayonet lock of adapter plug (10) clockwise to connect plug connector (8).

12. Fill the transmission with ATF+4. It will take approximately 4 quarts +/-.

13. Check the fluid level, it should be approximately 65mm up on a test dipstick (or anything that bottoms on the pan such as a very long clear zip tie) after about 1/2 hour or so of driving.

14. Enjoy the new feel of your HEMI transmission!

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