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Q:

my truck runs normally in reverse, but slo to go in forward gears,OD is flashing on 2002 Ford F-250 Super Duty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
7.3 liter diesel, auto trans
(2) Answers
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The overdrive light flashing means the TCM (transmission control module) has detected a problem and is setting a trouble code(s). Your symptom of being sluggish in forward gears suggests the module has shut down the operation of the shift solenoids and your truck is in failsafe mode, so you are starting out in third gear. You need to pull the codes from the TCM and have the problem diagnosed.
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