Transmission slipping?

The transmission will slip out of gear 1 to 3 times or so if I attempt to drive the vehicle when it is cold and I have not let it warm up for 5- 10 minutes prior. It is fine if I do let it warm up before driving.

I read on another site that I might want to look at a flush and filter change. However, it warned that if the vehicle had high mileage and had not been properly maintained, doing this would actually make it worse as the transmission was relying on the dirty fluid and metal shavings as a better grip on the worn internal gears and putting new, slick, fluid in could cause complete failure.

What are your thoughts on this please? The vehicle has not been properly maintained.

I checked the fluid level and looks to be fine. I can almost guarantee that the fluid has never been drained and replaced. I bought this used. Should I just have a fluid & filter replacement done?

Would a fluid flush at a oil change place work as well?

Have had the tranny checked by asi mech 2, one was a tranny mech, tests showed nothing wrong, tranny tech said the seals might be going bad causing fluid to leak into electronic, but it doesn't show any leakage when I check the gauage, none on ground. When it gets the od light flashes so we turn it off before we drive. Sometimes when its been driving for a while it want to slip at take off. The engine runs great so we're sure its not that. Could the coolant lines to transmission be plugged not letting it cool causing all this problems.

We had one done and they said it was fine

They ran the test said everything was ok, this was done 3 weeks ago

They ran a temp check said when transmission got hot the tranny cooler stayed cool

We were told by a friend who knows cars that we should drain and change the screen, I know our coolant has never been flushed in the radiator, could that be causing some of the problems. The tranny screen was changed 7 or 8 yrs ago

After driving a couple of miles the OverDrive Off light comes on and will not tuurn off with switch. The transmission appears to begin 'slipping' at that time. I have checked and trans fluid is full.
Any idea's?

My transmission does not engage immediately when shifting into drive, neither from park to drive or reverse to drive. I can shift to 2 or 1 and it will engage and then move to D, however, the direct shift to D only will work if I press the accellerator heavily and then it will jerk into forward. It also has begun to grind and/or slowly shift one into D as it goes into higher speeds. Any suggestions or thoughts?

Thank you for the reply. Yes it generally works as normal once I shift to D from 2, although lately it seems to be not a smooth shift as I increase speed. Do you suppose I need to get a rebuilt transmission or any other suggestions?

Thank you for the reply. Yes it generally works as normal once I shift to D from 2, although lately it seems to be not a smooth shift as I increase speed. Do you suppose I need to get a rebuilt transmission or any other suggestions?