Usage of a NAG-1 Transmission behind a SL6

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Hamhock

Hamhock

Official Guess Tester
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The NAG-1 Getrag built automatic transmission.
Coupled with a proper ration rear axle, it can take the torque, stock configuration, and the gearing ... the gearing isnt bad at all:


  • 1st Gear - 3.59:1
  • 2nd Gear - 2.19:1
  • 3rd Gear - 1.41:1
  • 4th Gear - 1.00:1
  • 5th gear - 0 .83:1
  • Reverse - 3.16:1
And there are stand alone controllers available. Reasonably priced in junkyards.
Also there are shift kits , shifters, and manual valve bodies .

Opinions?
 
Have you figured how to bolt it to a slant? How would the torque converter attach to the flexplate? Rear mount? Need to cut tranny tunnel? Even a Magnum tranny in an A-body requires cutting the tunnel.
 
BillGrissom said:
Have you figured how to bolt it to a slant? How would the torque converter attach to the flexplate? Rear mount? Need to cut tranny tunnel? Even a Magnum tranny in an A-body requires cutting the tunnel.
Click to expand...


No, I have not done this personally. However, I am sure that an adapter plate would be easy enough. I need to research this but I have good information that the NAG-1 MAY bolt on. Please, dont hold me to this. I need to find out more.

The NAG- is pretty big compared to early MoPAr automatics. I am sure there would have to be some surgery to the floorpan.

For your SAC:
http://www.powertraincontrolsolutions.com/dealers.php


For your manual valve body and other bits:
http://paramountperformanceproducts.com/
 
Check out the new hemi forum. Or post your questions in there I'm sure someone will chime in and answer all your questions.

Aj
 
There are certainly EASIER units to transplant in. I had thought about a 6 speed manual but .. alas... I am getting older and all that shifting... nah.

So I think that I am going for an automatic. What would you gentlemen recommend so that there is a nice Overdrive for highway mileage?
 
Maybe look into gear vendors. I know its $$$ but I like the idea of still using the factory type trans. Just my .02

Aj
 
Hamhock said:
There are certainly EASIER units to transplant in. I had thought about a 6 speed manual but .. alas... I am getting older and all that shifting... nah.

So I think that I am going for an automatic. What would you gentlemen recommend so that there is a nice Overdrive for highway mileage?
Click to expand...

The t56 six speed has almost the same gearing as a 833. So if you never shift to 5 and 6 it will drive pretty much the same. But the .5:1 top gear gives you a whole lot of rpm drop even with a steep rear gear.

There are zero easy options for a overdrive slant six automatic. Every choice has its drawback and require some fabrication skills. If highway mileage is what you are after you could get one of the wide ratio 904 transmissions and put a 2.45 rear axle in it. Taller rear tires is another choice that will get you some more mpg and less acceleration. Remember tire and gear swaps will change your speedo and odo accuracy.

And the nag requires wheel speed sensors to properly shift. You might be able to get away with just a driveshaft speed sensor, but i do not know for certain.
 
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