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Q: Does the "rear anti-lock brake" light and tranny not shifting into overdrive? on 1990 Ford F-250

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I have a 1990 F-250 4x4 7.3l diesel with E4OD tranny. Transmission no longer shifts into overdrive. Anti-lock rear brake light turned on the same time the tranny failed. Could this be related to the PCM? Transmission works well in all other gears, just no overdrive. What else might prevent it going into overdrive?
Thank you in advance for any help.

Bob
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