2001 7.3l Auto O/D light blinking
Hello Gal's/Guy's, I have been a happy owner of a 2001 Ford F-350 Lariat SuperDuty 7.3l Automatic 3 spd O/D crewcab.
I have owned this truck since 2005, this issue arouse in the spring of 2009. This issue happened when not under any stress, 4 passengers, no payload, not towing. I was on a 80 mile trip west of home. One mile from my exit the O/D light started blinking and I lost O/D (4th). No problems with 1st,2nd, or 3rd. I came home and let it cool down over night. I started it and drove down the road, O/D was working and every thing great for the first 5 min. Just after the trans gets up to temp, Again the O/D light, and I loose O/D function. I must park truck and turn it off, restart it and disable the O/D, and it performs without issue. I’ve been driving the truck with this issue going on 4 years. I have a OBDII code reader. When the O/D light comes on have attempted to get OBD codes. There are never any. No check engine light just O/D light on shifter knob flashes, till I pull over and turn the motor off. I disable O/D while in park and it works fine with out O/D. I fix all my vehicle issues, and never take them to the shop.
I’ve read a lot of forum posting’s only a few described this issue, I have seen no fixes as of yet. I’m going to step up my trouble shooting to you now, mabe one of you help me pin point a fix. I don’t think it is a rebuild issue. Because it only effects O/D. There has never been anything bad found at the bottom of the pan. The tranny fluid was stressed/aged but not burnt, it has been changed since the problem first happened. I’m leaning toward a weak Solenoid shifting pak and or weak or sticking valve, this is where it gets me. Why would O/D work while it is cool and then fail 5 min into warmup? Heat/resistance building up in the solenoid pak, causing the O/D solenoid to fail??? In the Solenoid pak?
I'm hoping your sugestions will help me get my mind arround this problem, your suggestions are welcome.
Dave In Albuquerque with out O/D
Last edited by Hatrick; 12-31-2012 at 05:19 AM.