2 to 3 HARD shift. - Ford Powerstroke Diesel Forum
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Old 07-09-2014, 09:35 AM
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2 to 3 HARD shift.

Hi guys. 97 F-250 with the E4od. Abs light is on and when accelerating at a normal speed the trannie shifts into 3rd very hard but if accelerating slow it will shift just fine. My abs light is on and ive checked all fuses. My speedo works. It gets a little jumpy when i reach about 70 mph. I feel like my problem is related to the abs but i have no idea what it is. Ive also checked th VSS in the rear. Any help would be nice!
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Old 07-09-2014, 08:09 PM
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It is related. The transmission shifts rely on the speed signal. The most common issue is the VSS, start by cleaning it then replacing it. The next most common issue is the PSOM (programmable speedometer/odometer). The VSS signal goes to the PSOM and RABS then to the PCM to control the transmission. Beyond that check the wires from the VSS to the PCM and RABS then pull the cover off the diff and check the teeth in the tone ring.
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