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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

reverse gear problem

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Old May 12, 2026 | 11:54 AM
  #1  
philippe de marseille's Avatar
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reverse gear problem

My 1992 F-150 5.8 with automatic transmission "slips" when I shift into reverse.
There's no problem going forward, but when shifting into reverse, I have to accelerate for it to start moving backward.
Does anyone have any ideas?
The oil level is fine.
Thanks
 
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Old May 12, 2026 | 11:56 AM
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Which auto trans do you have?
 
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Old May 12, 2026 | 02:36 PM
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aod box
 
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Old May 12, 2026 | 08:02 PM
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Ford did not put the AOD behind the 351W in a truck so was it swapped in by you or someone else? What is the transmission code on the driver’s side B pillar?
 
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Old May 14, 2026 | 06:54 AM
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The best thing would be for me to provide you with a photo of the plate on the box.

 
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Old May 14, 2026 | 01:45 PM
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or you could look at the pan and match it up to a transmission ID chart easily found on the internet. This is one I got by searching for Ford transmission ID chart…


 
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Old May 14, 2026 | 04:10 PM
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it's a E4OD
 
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Old May 14, 2026 | 04:24 PM
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There are feedbolts between the valve body and the case. If they loosen, they can cause this. If they are tight, about the only other way this could happen is a damaged reverse clutch.


 
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Old May 15, 2026 | 01:39 AM
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Thank you for your reply; I'll take this opportunity to replace the filter.
How many liters of oil should I order, and what type?
 
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Old May 15, 2026 | 08:25 AM
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Get 8. It may not use all of those, but sometimes they do,
 
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Old May 15, 2026 | 08:34 AM
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If I were to change the fluid in my transmission, I would drain the converter. I believe the factory converters had a drain plug [my 95 did]. I am not a fan of mixing old and new fluid and do what I can to prevent that. I swear, mine took about 16 quarts or more.

If you elect to dive deep in the transmission, what are you going to do when the plate gasket tears? I would have a new one. I would also know exactly where all the ***** should be when they fall out.
 
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