1. Do the SRT and automatic NA have the same transmission?
   
2. The service manual says we have the "NAG1" (New Automatic Gearbox, version 1) transmission. Was there ever a "NAG2?"

 

To the best of my knowledge:

No, and yes.

The NA should be W 5 A 330 (330 NM torque input) Output spider will have three arms. Uses six hole flex disk.

SRT should be W 5 A 580 (580 NM torque input) Output spider will have four arms. Uses eight hole flex disk.

NAG 1 is the 722.6 five speed.
NAG 2 is the 722.9 seven speed.

 

Thanks for the quick reply. I didn't see where they called out the difference between the NA and SRT transmissions in the SRT service manual. Maybe I just missed it.

Do you know if MB is still making the NAG1 transmission or is it obsolete?

 

Sorry for the late reply. 722.6/NAG1 still in production.

And the V6 and V8 versions use different gear ratios.