Transmission shifting on 2000 Ford F-350 Super Duty

Truck has 145,000miles on it. Lately it will not shift into overdrive when you first start out, after setting all night. When you drive approx. 3 to 4 miles it shifts to overdrive and acts right the rest of day. Next morning same thing over again.

by in Pearland, TX on January 04, 2011
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2 answers 6 comments
ANSWER by , January 06, 2011
You could have an issue with a valve sticking and the valvebody would need to be updated. If the O/d light flashes at you then that usually indicates an electrical issue. I see that your in Pearland, if you head into the Houston area during the day then I would recomend stoping by one of my locations and we will diagnose the issue for free.
COMMENT by , January 06, 2011
OK thanks
ANSWER by , January 04, 2011
when was the last time you had it serviced? it sounds like the valve body may be an issue. did the overdrive light come on and flash?? roy
COMMENT by , January 04, 2011
Thanks, trans has not been serviced. Truck was in Arceauex Ford in New Iberia. The Overdrive switch and shift stick were replaced. They thought this would solve the problem. Didn't, but before I take it back I wanted to see if someone had an idea of what else to look for.
COMMENT by , January 04, 2011
there is a valve body modifier that you can add to see if it frees up the valves. worth a try. otherwise, they are going to reccomend replacing the unit. Roy
COMMENT by , January 04, 2011
Roy, Is the valve body modifier a additive or a part ? Don
COMMENT by , January 04, 2011
it an additive that you can get at a parts store. if not, any trans shop will have it as they use it when re building units. Roy
COMMENT by , January 04, 2011
OK thanks, This has been a lot of help, I'll let you know how this works out Don