1996 F-150 Transmission Slips First 5 Minutes

Firt thing to check in that sort of situation is fluid level. If that's fine, when was the last time the fluid and filter was changed? If its been more than 50,000 miles, do it.

That said, sluggishness when cold can be a symptom of aging/shrinking seals inside an automatic. Probably just a plugged filter, but it could be more.

Slipping when it is cold often means that the line pressure is lower than it should be and that can be a result of fluid which is too viscous or has not been changed recently, plugged filter, dirty valve body parts, deteriorated rings or seals, and a worn pump.

When I took some transmission classes years ago, the instructor said always suspect the front pump when this sort of behavior was noticed. But, as Steve posted, other things can affect it too.

Have you serviced it recently? A service and adjust (if it is one that has adjustable bands) might be money well spent.

Hi. Thank you for your reply. I don't know how long it has been since the fluid anf filter was changed. I think I have put about 10 - 15,000 miles on it since I got it. I have the filter, just haven't got around to trying it yet. I am glad to NOT hear that a filter change wouldn't help it, and that it is shot.

Is it just the fluid being cold that does it?

Thanks.

Hi. Thank you for your reply. I will try to change the oil and filter, then see how it goes. I am hoping it is just old gunky oil causing the problem, but I wanted to ask some people who know a lot about them.

Thank you.

I think it has more to do with the fact that the lip seals on the clutch pistons get hard and stiff when cold and won't seal against their cylinders as well.

Hi. Thanks again for the information. I appreciate it.