Type U which I believe is 4R70W

145,000 mile

Rebuild a 110-115,000 or so. Fluid clear and full, no leaks

The problem is that when I shift from park to drive or from reverse to drive the forward gear is selected. I can feel it "catch" but not as strong as normal maybe could be described as soft

When accelerate I get a noticeable delay when going forward and then solid engagement.

Once that has passed the transmission operates normally; no delay from a stop and all up shifts and down shifts seem normal

Pretty repeatable. No check engine

What do you think? Thanks

 

When did this begin to show itself?

Mark Kovolsky will most likely appear so---he's kinda magical that way---but I'm wondering if the rebuilder didn't attend to or replace typical rebuild parts? If the fluid level is full and its the right type something inside the trans needs further attention.

 

I can't add much to that.

If you want to troubleshoot it, get a 0-350 PSI gauge with a 1/8" NPT thread. Insert it in the test port on the driver's side of the trans. Make sure you have a long enough hose that you can see what the pressure is doing when it's not acting right.

 

Just started in the last week

I will get a gauge and get back with you

 

Ordered a gauge and some fittings. They should arrive next week

As air will be trapped in the set up once connected, will I have "bleed" the air out to get a correct reading?

Let me know

 

No, you don't need to bleed air.

 

The gauge is 0- 300 PSI

Let me know what you think

The operation was fine until about the 4 minute mark on the video

I put it in reverse and then back to drive and it took about 30 seconds to get going

 

What do I think? I think I can't read the gauge. Nice drive around, but the scenery wasn't much. I heard what sounded like you moving the shift lever. If you could have said what gear you had it in this MIGHT have made some sense. All I got out of this is that you drove around.

Try this: Zoom in on the gauge so that we can see the numbers. Start with the trans in P. Move it to R, and say so. Move it to N and say so, repeating all the way to 1.

Go back to R. Hold the brake down with your left foot while pushing the go pedal to the floor. DO NOT HOLD IT ON THE FLOOR MORE THAN 5 SECONDS. Then put it in N and hold the engine speed at high idle for at least 30 seconds. This gets the hot fluid out of the torque converter.

Go back to D. Hold the brake down with your left foot while pushing the go pedal to the floor. DO NOT HOLD IT ON THE FLOOR MORE THAN 5 SECONDS. Then put it in N and hold the engine speed at high idle for at least 30 seconds. This gets the hot fluid out of the torque converter.

Go back to 2. Hold the brake down with your left foot while pushing the go pedal to the floor. DO NOT HOLD IT ON THE FLOOR MORE THAN 5 SECONDS. Then put it in N and hold the engine speed at high idle for at least 30 seconds. This gets the hot fluid out of the torque converter.

Go back to 1. Hold the brake down with your left foot while pushing the go pedal to the floor. DO NOT HOLD IT ON THE FLOOR MORE THAN 5 SECONDS. Then put it in N and hold the engine speed at high idle for at least 30 seconds. This gets the hot fluid out of the torque converter.

 

I will give if a go and let you know

 

Hopefully this is less scenic and more usefull

 

Your pressures are low. At idle it should be 50-75 PSI.

The reasons could be internal leakage, a bad electronic pressure control (EPC) solenoid, or a worn pump.

 

Mark

Thanks for the quick response

All pressures are low?

Or mainly the pressure at idle?

Is the pump a gear pump, positive displacement?

Changing the solenoid is in my skill set

What are my chances?

 

Mark

Thanks for the quick response

All pressures are low?

Or mainly the pressure at idle?

Is the pump a gear pump, positive displacement?

Changing the solenoid is in my skill set

What are my chances?

 

I could only tell at idle. Those were low. Mostly you didn't hold stall long enough to know what the pressures are. And I haven't found a 4R70W pressure schedule.

Yes.

Just barely above zero.

 

Mark;

Using that attached I think only my WOT stall on 2 is low and that could be from not holding it long enough as you mentioned.




I will try I again this weekend