com transmission Problem

[66tbirdnc]

I recently purchased a 66 with COM ( not C6). Transmission was supposedly rebuilt 10 years ago and not driven much since. i had fluid changed and pan screen cleaned right away. Type F fluid. When warm all is fine, but when first driving for the day ( 50 degrees, not not real cold) transmission resists shifting to 3rd until about 45 MPH. Once it has shifted a few times, shifts at about 38 MPH. Also, when 'cold' like this, will downshift to 2nd while driving along at an even speed. Once the engine temp is up to normal--maybe after 3 miles--shifts up and down fine....and no more downshifting on its own.

Is that enough to tell if it is a vacuum problem, modulator, or worse??

Comments??

thanks

 

[boaterbob]

First you would have to check the vaccum at the trans. Sounds like the seals in the trans are hard when it warms up everthing expands and it shifts. Go to ford transmission forum for good advice on that. Let us know if you resolve the problem. Oh yea sometimes a good trans additive works

 

[tbird5866]

Ford transmission Forum

Boaterbob; give us a link to "Ford Transmission Forum"

 

[boaterbob]

www.network54.com/forum/260730

 

[grossman09]

I know this is an old thread but i have a similar issue but my tranny whistles or screatchea to go into firat when cold. But if i just drive after about a mile or so it has no problems. I was told it could be the modulator? Any ideas..