High Performance NAG1 Transmission Kit

High Performance NAG1 Transmission Kit


2005-2014 Chrysler LX/LC below 550 rwhp

2006-2013 Jeep SRT8 below 475 rwhp

Porsche w/722.6 auto transmission below 500 rwhp

Mercedes w/ 722.6 auto transmission below 500 rwhp

NAG1 Transmission Kit Includes:

  • Stage II Valve body
  • Mercedes AMG clutches and steels for the problematic clutch packs. Reverse not included.
    • (NOT Chrysler (made in China crap) …these are the real deal.
  • Mercedes gasket and seal kit.
  • Mercedes oil filter.

This kit is meant to be professionally installed. It is NOT a “do it yourself” kit.

Stage II Valve Body Information:

  • Designed by using a fully operational, test NAG1 that monitored and recorded all clutch pressures, torque converter pressures, and torque converter lock up clutch pressures with a Race Pak.
  • The Stage II modified valve body will increase the NAG1 shift pressures.
  • The more aggressively the NAG1 is driven, the firmer the shift.
  • The downshifts are firmer than stock also, but not to the point of being too harsh.


High Performance NAG1 Transmission Kits are in stock and ready for immediate delivery.

Price: $1,850 + core charge

Call 704 451-6332 for shipping details.

Core charge of $150 will be refunded if rebuildable valve body core is received within 30 days of shipping

Note: Core charge waived for Authorized shops

Ready to order the High Performance NAG1 Transmission Kit for your Mopar?
It's never been easier, contact Builder Bill here on the how to order page.