![]() Both old and new computers have same recomended calibration code. ![]() Is says it might be possible to fix my tranny problem and eliminate the blinking light error code by replacing my F5TF-ARC computer with a later design, model F5PF-BRA. I downloaded a couple Ford TSB's off the adddata website and am a bit confused regarding the Ford TSB article 98-5-1 dtd 03/16/98. Figuring the intermediate servo band is not being properly applied I have replaced a hard rubber seal intermediate servo piston and seal but it has not helped. I did a stall test per ATSG and it passed the required spec rpm range (not over speeding or going under) in all shift lever positions. 3/4 Od light flashes and error code readout with analog vom gives me a code 646 (2nd gear ratio problem). I am getting a delayed tranny shift from 1st to 2nd and no engine braking when in manual 2nd. ![]() I have a 95 Ford Explorer, 4.0L, 2wd, with 4R55E tranny, with non reprogramable EEC-IV computer part number F5TF-12A650-ARC having calibration code 5-58B-R10.
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