2001 4r100, no gears cold, perfect at operation temperature

[ChrisDomRep]

Hey all, maybe someone can bring me in the right direction.

It started slowly, with a long 1 gear (D) delay after the cold start. Reverse popped in rough.

When the trans gets on operation temperature, it runs and shifts fine. No delays, no harsh shift, everything is fine.

So in the last 6 month I changed the following parts.

Oil,
Filter,
Solenoid pack,
Solenoid pack connector,
Transgo shift improvement Kit,
Transmission range sensor,
Cleaned up accumulator body and so on.

After all, the truck still needs to be at operation temperature, until it shifts right and is drivable.

1 gear comes in between 5 to 10 minutes, reverse takes much longer.

Forscan throws out coast clutch sometimes. Which occurred since the rebuild solenoid pack is in.

One thing is also curious, forscan shows trans fluid temp of -1 to -3 ° c in P, R,N, OD.

When shifted in 2 or 1, or deactivated OD , so in D, trans temp shows up correct.

Trans pressure is jumping between 10 and 150 while selecting.

Rpms are not highered well while shifting to D or R..

I really don't want to drop the Transmission for a rebuilt. Its not worth ot for the old boy i think.

The truck is running great when hot. So whats the issue in cold ?

 

[GaryH]

A transmission might exhibit those symptoms if it was low on fluid. But that's too obvious. So other than that I have no idea.

AI says:

When your Ford Expedition's transmission won't shift until warm, it's
usually due to thickened cold transmission fluid, low fluid levels, or issues with electronic components like shift solenoids, sensors (like the transmission range sensor), or the Transmission Control Module (TCM), often related to sticky valve body parts or failing transmission bands, requiring a fluid check, sensor/solenoid inspection, or potential valve body service to restore proper hydraulic flow

 

[ChrisDomRep]

Hey Gary, thanks for your reply.

The trans never ran on low fluid with me since the last 3 years. It worked perfectly for about 20k miles. The issue started slowly with a delayed , harsh reverse. So I began with an Oil change, which made it a bit better for a few days.

It's not that easy to get parts and good oil here in Dominican Republic.

I'm using atf with the mercon V spec.

Changed the oil and the filter three times, last time when I put the shift improvement kit in. While cleaning up the accumulator and so on, I disassembled all the valves, checked the springs and cleaned up everything.

 

[Fastcar]

This is nothing but a wag. Were it me I'd be looking to finding a trans. for parts and swap out the valve body.

 

[Avian]

24 year old car, in an environment of rust.... I'd drive it til it fails.