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I wish I could be more specific, but there are about 120 different reasons for the flashing OD light.
Also no Vacuum lines on that transmission.
Vehicle speed sensor is located in the rear axle (TOP)
To test for a faulty programmable speedometer/odometer module (PSOM), unplug the vehicle speed sensor located in the rear axle and recheck for the driveability symptom to be present when moving away from a stop. If the symptom is no longer present, the PSOM located in the cluster assembly is the cause of the condition. The PSOM converts the analog vehicle speed sensor signal into a digital signal and sends it on to the powertrain control module (PCM) for a vehicle speed input. When the PCM receives this erratic indication from the PSOM, it generally calculates vehicle speed above 100 MPH and cuts out an injector bank and locks the converter. This causes the stall or surge type condition to avoid vehicle overspeed. If the vehicle speed sensor (VSS) in the rear axle were causing an erratic input, the vehicle operator would notice the ABS or RABS warning light would also illuminate as the PSOM and the ABS module are fed the VSS signal in parallel with the PCM. The PSOM assembly contains the speedometer and odometer.
It doesn't matter if you clear the codes if there is a problem the codes will return in a short amount of time .
Try above test may help you narrow down your problem or even nail it.