I have a 1999 Ford F250 Superduty and it will not go forward. Reverse works fine. I checked the transmission fluid and it was full. I dropped the pan and found the transmission fluid looked brand new and the pan was extremely clean. I have had this truck for a year and had no problems. I noticed the transmission slipping a little in first when I left for work, but all the rest of the forward gears were fine. Next time I had to stop and restart in first, I found I had no forward gears only reverse.
I believe that reverse is operated by a brake band. So it seems to be stuck. It is operated by a piston, and the seal could have swelled and caused too much friction. But you could loosen up the adjustor so that it is disengaged, in order to get forward gears again. Perhaps you can force the piston to retract as well, once you drop the pan again.
5,184 views
Usually answered in minutes!
When the transmission warms up the forward and reverse gears stop working. You can cycle the key switch on and off 3 times and the transmission will start to work again. What I think is going on is that I have a stuck solenoid in the valve body. I have changed the filters and fluid and did put mercon sp back in.
I Think I Would Start By Going Through The Valve Body, Sounds Like Something May Be Going South. Start By Checking Your Line Pressure At The Trans. Test Port, Screw In Pressure Tester. Call Dealer & Ask What the Normal Pressure Should Be, I Know It Is Not A High Pressure Line, So Don't Expect A Real High Pressure. If That Checks Out, I Would Pull The Valvebody Down, Take A Tiny Screwdriver & StartPushing Or Moving The Piston Valve Back & Forth To See If You Have Sticking Valvebody Pistons. Spry Them Down With WD40, That Works The Best For Me When I Rebuild Them. Look For Any Sign Of Scaring Or Wear. Could Also Be Electrical Since You Said You Turned It On & Off Then It Worked Fine. Try Unplugging The Electrical Connectors & Plug Them Back In. Maybe PCM Crapped Out, May Have To Pay To Have It Diagnosed, You Could Spend A Small Fortune Throwin' Parts At It.
×