1991 Ford F150 shifting problems
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Look at the Door Jamb sticker if it is still on the truck. Use this for reference: Ford Door Sticker Decoder .: Articles
If you have a transmission code "E" you have an E4OD. If it is Trans. Code "T" you have an AOD. Yes I realize the decoder says Trans. Code "T" is listed as 4 speed automatic for a Ranger, but my Ford Service Manual states that T is an AOD in F-series trucks.
If the door jamb stick is gone you can refer to this: Ford Transmission Spotter's Guide .: Articles
I also see you previously stated your truck had a 351W, that by default should make your transmission an E4OD.
If you have a transmission code "E" you have an E4OD. If it is Trans. Code "T" you have an AOD. Yes I realize the decoder says Trans. Code "T" is listed as 4 speed automatic for a Ranger, but my Ford Service Manual states that T is an AOD in F-series trucks.
If the door jamb stick is gone you can refer to this: Ford Transmission Spotter's Guide .: Articles
I also see you previously stated your truck had a 351W, that by default should make your transmission an E4OD.
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Warm up the engine and transmission then do this: Ford Fuel Injection » How To Run a Self-Test
or purchase one of these: Amazon.com: Equus 3145 Ford Digital Code Reader: Automotive
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