42RH / A-500 in a Duster with pictures.

dartjack said

Couple of quick questions. What kind of shift improvement did you do?(brand) Did you change the 1-2 shift spring to raise it up to 2-3 rpm?

Click to expand...

I did what was in the kit, generally speaking the only way to raise the shift points is by shimming the throttle valve (if I recall correct) and making custom governor weights. The weights are different than 904/727.

Fairly sure I used a Transgo SK-TFOD-JR Shift Kit with a few other tweaks.