1990 f150 automatic with overdrive shifts only at high rpms

Shifts fine when cold, but when it warms up it shifts only at high rpms and after second gear it jumps into overdrive. and if you get into it when its in overdrive the transmission would act like its in neutral then it will kick in 3rd gear then jump back in overdrive. what is the problem

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fordexpert

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Posted on Feb 18, 2018

fordexpert

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Kinda sounds like it works when fluid is thick and not after it warms up. If it has been awhile since trans fluid and filter were changed it is the most simple thing to change. The torque converter is a big pump, it may be going and not providing enough pressure. This could be checked on most transmissions by a shop expert. Sometimes pressure can be adjusted externally.

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Anonymous

1 Answer
Posted on Apr 15, 2009

SOURCE: f150 transmission neutralizes when shifts to overdrive

I have that exact same truck and transmission and My Transmission did the exact same thing about a year ago and there was some kind of snap ring inside the transmission that broke. I originally thought it had to be an electirical problem because the truck shifted fine until OD or if i turned OD off. The 4r70w is a light transmission and i would suggest you have a shift kit put in and they make a heavier kit to beef it up.. Sorry its probably not the new you were looking for.

Anonymous

202 Answers
Posted on May 27, 2009

SOURCE: 1990 f150 transmission up shift to early

Sounds like the passing gear cable is out of adjustment. Get a shop manual and see what the specs are on how to adjust it properly. It is a pretty simple fix.

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