Transmission advice - saga continues

Sorry I haven't replied ...

The proper complete procedure will (incl FULL DIAGNOSTIC SEQUENCE) will be found in the FORD WSM or most likely the separate TRANSMISSION MANUAL.

You have to have that info.
 

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I do have it - I mentioned I've gone thru A-F (pressure regulation) now from the troubleshooting section in the manual and just posted pressure results.

I'd be curious what folks think of the results. If max pressure is a little high in Dr and a little low in Reverse, will bending the internal tab fix that or does that suggest clutch isn't handling pressure correctly?
 
delco1946 said:
I do have it - I mentioned I've gone thru A-F (pressure regulation) now from the troubleshooting section in the manual and just posted pressure results.

I'd be curious what folks think of the results. If max pressure is a little high in Dr and a little low in Reverse, will bending the internal tab fix that or does that suggest clutch isn't handling pressure correctly?
Click to expand...

OK, let me try this one more time ...

Ran the pressure test. Gauge needle bounces all over the place ( antique) but followed procedure. Numbers seem close considering the throttle lever has a slight bend, not to mention doing this on my back in the street.

In reverse, right around 63-65 psi at 0 degrees. Pressure rise at 3.5 degrees. Max pressure was lower than spec at around 150-160, which is slightly low.

Forward (Dr): again 65psi at 0 degrees. Pressure rise again at 3.5 degrees. Max pressure at 12 ish degrees at 160 psi, slightly high.

So, basically it seems to have passed the pressure test? Or do this numbers suggest something wrong?
Click to expand...

1st off, you are going to need a QUALITY PRESSURE GAUGE.

You are going to take a reading as the WSM suggests. If the pressure cannot be adjusted as per SPEC, you go into the DIAGNOSTIC CHART as to why.

This is your first step. If proper pressure can be obtained, then you go through a service procedure, adjust the bands and at the minimum a fluid/filter service. When you drop that pan, what lies on the bottom will indicate if the trans can be saved. The TRANS may be cooked.

And again, you are going to have to ID the TRANS as it may not be the one that came through assembly and the calibrations may be different.
 
AND ...

The TV LINKAGE has to be the correct setup for the trans as it was assembled. If the car had an engine and/or trans swap, the linkage must match the setup, if that makes sense.

Also any worn/damaged linkages must be repaired as needed.

You are now returned to normal programming...
 
Bumping this…

I’ve gone through the steps outlined in the manual. I have the right manual. The manual does not describe my situation.

My pressurize rise is exactly as it ought to be however, the Maximum pressure seems to be incorrect. Pressures are not high enough in reverse and too high and drive. All my linkages, throttle, control, rod, etc. have been adjusted to spec. The manual does not describe the situation at all or what the next steps would be to try and address this. Has anyone experienced a similar condition?
 
Bands lock the drums and clutch pack pistons pressure up and hold the pack disks. Internal leakage can happen but another thing is problematic build up of clutch packs with non stock type plates. The originals were metal on metal but some modern replacements are metal on composition type plates and some plates had fit problems. A good trans tech will pay attention to fit of the stacks and make sure they fit and function. The old ones have two pumps and at least the main pump needs to have good fit and function to get good pressure. All control pressure comes from the throttle actuated TV valve. It adds more pressure with more throttle but it generally operates well with proper adjustment. A person needs a good pressure gauge set up to get them right.

If a particular circuit such at the reverse circuit is leaking then the pressure will be low in that action. A person needs to study what pack is locked and what drum is locked and look for leaks or other issues that are there. I think part of reverse happen through the planetary so it has to be right as well.

Any trans tech can figure it out over time but you need a smart one that can figure out where the problems may be by good test methods and keen observations.
 
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