Well I'm about to drop in my completed gearset and I have an Extra thrust bearing. It's mentioned no where else in the book so I'm hoping someone can scan a copy of page 79 because mine's blank.

I'm thinking it goes on top of the forward housing to ride against the center support but I'm not sure and I don't know rightside up anyways.

Any help would be super highly appreciated.

 

There is one that goes on the face of the forward housing. When your completed "gearset" is in position to be installed, rightside up will be facing toward the front of the transmission. The bearing fits inside the completed assembly below the rings on the face of the forward housing.

 

Awesome, thanks RacerX. I found a pic in this thread to help too:

Ford 4R100 Transmission rebuild / Disassembly pictures..

Could you help with an aircheck question? In this picture:

if i blow air in the black arrows' hole it comes out the red rainbow arrows' hole. If I blow air in the blue arrows' hole it leaks down slowly. The OD and L/R holes seem to hold air till I let it out but these ones leak down. Is that bad?

 

Not if you get a thump from the port with blue arrow and definitely replaced all rings. Rings are controlled leaks. If you blow air in the port with the black arrow, a controlled leak could allow a small amount of air to come out the port with red arrow. A large amount of air coming out would be bad.


During actual transmission operation, pressurized fluid is entering those ports simultaneously, which is totally different than air blown in one port only.

All the best,
Racer
Product research and development consultant to the automotive industry.
Certified specialist on automotive electronic control systems, diesel and gasoline engines, custom transmission, powertrain and engine builder.

 

That's awesome. I replaced every thing and there is definite movement in there

 

Black arrow is the intermediate lube, it should leak.

Blue arrow is the forward clutch, it should have a good thump with minimal leak.

Red arrow is the direct clutch, it should have a good thump with minimal leak.

If you are going to pull it back apart you might want to air check the drums on the center support.

 

All is well.

You should notice the same movement or get a thump when applying air in the port with red arrow as jk080 said. It probably won't be a good thump in either blue or red ports because your not building a stock transmission. A good thump requires more piston travel. The more a piston travels than it needs to, the faster it and it's seal will wear.

The other air checks you mentioned don't have ring seals air can leak past, they should seem to hold air or have a thump.

There is an error on the air check locations on page 40 in some, possibly all ATSG 4R100 manuals. I have checked the ATSG 4R100 "Revised Edition" and it has the error on page 40. As jk080 said the port with black arrow is lube, air should pass through it freely. On page 40 ATSG shows the lube port (black arrow in photo) as Intermediate Clutch. ATSG doesn't identify the actual air check location for the Intermediate Clutch at all in their 4R100 manual "Revised Edition New Updates and Changes Included".

Refer to your mini manual that came in the gasket set. The correct air check locations are shown for all clutches on the page titled "Air tests and passages".

We use a high temperature material in race only builds instead of ring seals. By design, fluid will make them expand and seal tight in the hottest heat. They expand very little in compressed air however, making air checks difficult. A larger volume of air will leak past them. With a well trained ear, a very slight thump can be heard during the rush of air if all is well. tjbeggs has them in his Racer X Transmission.