The J-Mod is the best thing you can do to your 4r70w transmission, besides adding Mercon V and a cooler.
There is information about it, in the Tech Articles Section. Look in the Transmissions
area. Read "Transmissions 101", plus A-Trains "Shifty Business".
The increased intake sound sounds a bit like a growl on mine. But only when I frog tha gas. I still love the sound it gives. Time for an exahust to get god sound in stereo when standing next to my car.
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