C-6 stuck in 3rd

[widegauge]

I have a 1976 ford f-250 2wd 460 w/c-6 I was pulling a car trailer with a reg cab ranger on it for about 7 mil. after I dropped off the ranger and trailer and drove away, I noticed that my tranny was stuck in 3rd. I tried to down shift by hand and nothing and if I floor it, it would act like it was trying to shift, but would make a slight noise, kinda a gurgling sound. but when a speed for third it runs fine, and in rewind it works fine too, just only starts and drives in third.

any thoughts,

thanks.

[rjewkes]

have you checked the vacuum modulator?

[widegauge]

I thought about that but wouldn't that make the tranny shift slow and slip. mine wont shift at all, it is always in 3rd.

[68F250]

Mine did that after not driving it for awhile, turned out the governor on the tailshaft was stuck. Did a fluid change, crossed my fingers, problem gone.

[Jake11]

Get it rolling at idle. Slam it into "park".