No forward gears, - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 02-25-2010, 05:53 PM Thread Starter
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No forward gears,

Have a 2001 F250, loses all forward gears every now and then, let it sit overnight and it will move, don't think it needs a rebuild, it stopped moving forward on me, then next day it moved i drove from ne kentucky to nw ohio and back pulling a trailer, no problems, but lost all forward again, reverse works fine, any ideas???
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post #2 of 8 Old 02-25-2010, 05:57 PM
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fluid?? check all fuses.

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post #3 of 8 Old 02-27-2010, 03:58 AM
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could be a broken return spring in the fwd clutch drum. Sometimes it will also cause a lockup in reverse.
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post #4 of 8 Old 02-27-2010, 11:57 AM Thread Starter
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fluid is fine, fuses good, i was suggested to try changing the fulid and filter?? also been told maybe the tc was bad
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post #5 of 8 Old 03-20-2010, 02:03 PM
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Quote:
Originally Posted by thb2008 View Post
Have a 2001 F250, loses all forward gears every now and then, let it sit overnight and it will move, don't think it needs a rebuild, it stopped moving forward on me, then next day it moved i drove from ne kentucky to nw ohio and back pulling a trailer, no problems, but lost all forward again, reverse works fine, any ideas???
sounds just like mine, you need to start reading about the 2001 model with the mechanical diode. it's a sort of sprag gear but ford cheaped out and didn't design this one very well. my 2001 did the same thing turns out it was the diode. the trans had to be rebuilt. usually you will experience loss of 3rd gear, but occassionaly it messes everything up. maybe this isn't your situation but total loss of forward gears is not going to be electrical. these trans do use electrical solenoids but mainly to control sequence smoothness and timing. i have never read or seen an electrical prob stop all gears, these trans are hydraulic not electric. maybe none of this fits your bill but someone on this board will know.
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post #6 of 8 Old 03-20-2010, 02:14 PM
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Welcome to my world !! This happend to me twice and it was a tc failure that contaminated the trans. The morning driving will end soon and you will need a rebuild. If you can get to a trusted Trans Mech do it so you can get confirmation.
So I got away from the OEM trans and got a built one with a HD TC .

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post #7 of 8 Old 03-20-2010, 04:00 PM
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The diodecan fail 2 ways. If it locks up, you'll have 2nd gear starts and bindup on 2-3 shift. Shortly after that , it will burn out 3rd.
If it breaks into, you have no 2nd and shortly after that you loose 3rd from 3rd trying to slow eng down from a first to 3rd shift.
I think you have a center bearing comeing apart. This allows the fwd drum to wobble in the center support where fwd clutches are fed from. You will eventually loose all fwd gears all the time.
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post #8 of 8 Old 08-28-2015, 09:56 AM
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I have a 1995 f250 7.3l powerstroke, from a stop light I lost drive (2-3 gear) no hook up at all, as if I was in neutral.... I then shifted manually down to first and the trans engaged, brought up to second gear and nothing... back down to first it grabed I brought the rpms up and shifted it to second and it grabbed, pulled over parked it, reverse worked fine started off to autozone to check trans fluid and it worked fine, I read somewhere about tail lights being near or on the same circuit as the trans? is that true? and doess that seem like my case?
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