High Performance NAG1 Transmission Kit

High Performance NAG1 Transmission Kit

For LX & LC below 550 rwhp

For Jeep SRT8 below 475 whp

NAG1 Transmission Kit Includes:

  • Stage II Valve body
  • Mercedes AMG clutches and steels
    • (NOT Chrysler (made in China crap)  or aftermarket)…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 all clutch pressures, torque converter pressures, and torque converter lock up clutch pressures all with accurate analog gauges.
  • 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 $500 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.