I lost reverse?

Tiny
PARKERGUNS
  • MEMBER
  • 2004 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 44,000 MILES
Have a F150 with 44K mileage that has run flawlessly and transmission worked nicely thur these mileage. Pulled it in the other day to change out the original tranny filter and do a routine fluid exchange. When we pulled it down off the ramps we have LOST REVERSE? It did try to back up and we got the O/D light blinking and then the "Trans Fault" over in the odometer window? All forward gears still working perfectly but NO REVERSE at all? HELP!
Sunday, February 13th, 2011 AT 2:43 PM

4 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Scan for codes as a first step, and you did use Mercon V? Filter change is not required during flush and fill.
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Tuesday, March 23rd, 2021 AT 12:34 PM
Tiny
PARKERGUNS
  • MEMBER
  • 3 POSTS
I have a friend bring a scan tool over this afternoon. What we actually did was drop the fluid and changed the filter then added 4 qts of Mercon III by mistake? We then started it and found out that reverse was not right so shut it off and went and got 14 qts of Mercon V and did a fluid exchange. So after the filter change is was run for 2-3 mins with 4 quarts of Mercon III added to the 9 quarts of original fluid that had 44K on it. Ford people said that wouldnt have anything to do with it imediately slipping and said "just change out ALL the fluid and you will be fine" I did that and it didnt change anything. Reverse is now no existent and just before we pulled it in the truck would pull a mountain in REV?
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Tuesday, March 23rd, 2021 AT 12:34 PM
Tiny
PARKERGUNS
  • MEMBER
  • 3 POSTS
Merlin 2021 thanks for responding so fast. I really appreaciate it as have no idea how much trouble we could be in here after a simple filter change?
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Tuesday, March 23rd, 2021 AT 12:34 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Shift solenoids are on the valve body as is the filter, I would pull the pan, remove the filter and inspect for any pinched wires, also drain out the converter by removing the drain plug on it(if it has one), some don't! Put the truck back together, and put it on a flushing machine, the machine actually cleans the tranny, that's why it's used today! And the Ford manual does say transmission failure can result by using the wrong fluid, but I think after doing as I suggested and reading the codes, you will bo OK.
Post the codes here.
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Tuesday, March 23rd, 2021 AT 12:34 PM

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