• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

w/o taking the xmission out


croatankid

Member
Joined
Jul 3, 2018
Messages
120
Reaction score
5
Points
18
Location
jacksonville, nc
Vehicle Year
1990
Make / Model
ford
Engine Size
4 liter
Transmission
Automatic
My credo
I'll do it myself
I have a a4ld. It needs rebuilding but it's a daily driver. I can lay it up a few days but not long enough to do the whole thing. I want to do what ever I can w/o taking it out. I want to rebuild the valve body, replace the vacuum mod, and replace the servos and filter and install a drain plug. Is there anything else I should do while the pan is off?. .
 


RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,291
Reaction score
8,295
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Not much else you can do

The clutches and bands(brakes) wear out just like clutches and brakes do on manual trans and wheels, just not as fast since they are cooled, well cooler, lol.

Those are the parts that are changed with full rebuild, also main pump

All automatics run on pressure, ATF fluid pressure, the pressure comes from the main pump(front pump) and this pressure is then routed thru the Valve Body.
The Valve body controls where the pressure goes, to engage or disengage clutches, to engage or disengage brakes(bands)
Disengaging a clutch doesn't mean that part of the transmission will stop spinning, thats where the bands(brakes) come in after clutch is disengaged the band clamps on that part to hold it from spinning.

If pressure is low then you get slipping, if low enough then no GO at all
You need 125psi to go forward, 175 to Reverse
This is why reverse is often lost before forward

Pressure is often lost in Valve Body seals and gasket, so a good thing to rebuild to get the most miles from the clutches and bands, but they do eventually wear out.
 

croatankid

Member
Joined
Jul 3, 2018
Messages
120
Reaction score
5
Points
18
Location
jacksonville, nc
Vehicle Year
1990
Make / Model
ford
Engine Size
4 liter
Transmission
Automatic
My credo
I'll do it myself
Thanks for all that good information. Yes, I want to do a complete rebuild. If I do the valve body and the xmission at the same time, and there's a problem, it will be harder to isolate the problem. So I will do one, the VB, and see if it works right, then when I have more time, I will do the whole thing.
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,291
Reaction score
8,295
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Yes, good plan
 

Shran

Junk Collector
TRS Forum Moderator
Supporting Member
Article Contributor
V8 Engine Swap
Solid Axle Swap
Joined
Mar 4, 2008
Messages
8,637
Reaction score
4,703
Points
113
Location
Rapid City SD
Engine Type
V8
Engine Size
5.0
I'm just curious - is something in the trans not working right? I mean... rebuilding the valve body, replacing servos, etc is really more than you need to do if the trans is working fine. If it's a high mileage deal and/or it has some issues then just do a full rebuild... when it goes, you're going to be removing or replacing all of that anyway.

If it's working fine just do a filter and fluid change and install your drain plug, don't fix it if it ain't broke.
 

bobbywalter

TRS Technical Staff
TRS Event Staff
V8 Engine Swap
TRS Technical Advisor
TRS Banner 2012-2015
TRS 20th Anniversary
Ugly Truck of Month
TRS Event Participant
Joined
Aug 9, 2007
Messages
23,470
Reaction score
4,667
Points
113
Location
woodhaven mi
Vehicle Year
1988
Make / Model
FORD mostly
Engine Type
V8
Engine Size
BIGGER
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
sawzall?
Tire Size
33-44
My credo
it is easier to fix and understand than "her"
:shok:


i cant believe that line of thought. the valve body is very susceptible to malfunction from worn torque converter and rotating part wear particles..every time you work on it your taking a chance of janking it up permanently.. vicious cycle.


if your time limited, swapping in a known working unit is the best use of limited time.

or scheduling a bench build date with a known local builder that handles these pieces of crap. they will have it wound out in half a day. so two day turn around on your back is easy to pull off.
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,613
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
or scheduling a bench build date with a known local builder that handles these pieces of crap. they will have it wound out in half a day. so two day turn around on your back is easy to pull off.
Yeah. On a 2wd I could have the trans out and apart in about an hour.

Ask me how I know. :annoyed:
 

croatankid

Member
Joined
Jul 3, 2018
Messages
120
Reaction score
5
Points
18
Location
jacksonville, nc
Vehicle Year
1990
Make / Model
ford
Engine Size
4 liter
Transmission
Automatic
My credo
I'll do it myself
Yes something is wrong with the tranny, I don't know how many miles are on it, it hardly engages in 3rd gear and it makes a rattling sound when I come to a stop. I want to do a complete rebuild but I'm timid about doing all at one time. If I do the VB first and test that, I'll limit the number of places I might screw up. So I want to do some and test it before moving on. It will also limit the time the truck is down at a time though over all it will down longer in the end.
 

Sponsored Ad


Sponsored Ad

Staff online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top