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4r100 1-2 shift problems, HELP!!
I have a 12/99 f-350, most mods in sig. If you let the truck idle less than 1-2 mins and take off it will make the 1-2 shift once, after that it will only shift if you lift off the throttle. Sometimes the o.d. light will flash but it only gets a code 1-2 shift malfunction? Does this mean its in the valvebody? I'm lost here, after it warms up you have to be at 20mph and 23-2500rpm and let off the throttle and it will shift. It does have a banks transcommand on it and I have used the bypass plug with no change.
2000 f-350 CCSB
Fabtech 10" with ladder bars
dual fox shocks w/Res
20x12 rockstars wrapped with 40x15.50 toyos
04 lariat leather inside
banks cac, big head wg, compressor wheel
road armor bumpers front and rear