[SLOCOUPE]

I'm getting more intimate with auto transmissions than I want to. Lol

Working on a TH400.

I made the mistake of not checking it before I took apart so I'm not sure what it was before. I checked it with a dial indiacator and it's .042. Best I can tell rear is a few thousands.

Everything is back in it and in the proper places. I used a manual.

Does this need to be tightened up? I'm sure it was like this before. I didn't build the trans originally.

If I do shim it do I shim between forward drum and direct? Or do I shim under he Torrington that sits on the sun gear? What do I shim with? Will a thrust kit come with different thickness shims? Never have done this before. I know I don't want to get too much under the pump for fear of pulling off of the seals.

Thanks for the help.

 

[stuarta]

Thrust washers are in various thicknesses and installed on the pump.

 

[Hutch]

If you don't have a bearing between the hub and direct drum, the only solution is a thicker washer between the hub and forward drum to move the forward drum up to the pump.


Hutch

 

[SLOCOUPE]

Looks like thickest is .117. This won't cause any issues will it?

That will cut my play roughly in half

Where can I buy a bearing to go in between the forward and direct? This would replace the thrust washer that is currently there? Bearing is thicker or do you add shims to it to get what you need?

 

[SLOCOUPE]

Never mind the bearing question. It looks like it requires machining. Out of my league and looks like unnecessary for my application.

Looks like a thicker washer it it.

 

[Hutch]

You have to he careful moving the drum back that you don't cause a sealing ring problem on the pump.


Hutch

 

[SLOCOUPE]

Ok what's the "proper" way to fix this and then how will I be able too without a shit ton of work. Had to be this way when I got it. It only has @3 miles on it but I don't want to be back in it again next week either cause I didn't fix it

Maybe that's why the place that built it left it like this cause they couldn't fix it or didn't want to. Lol

Or is the front thrust not that critical?

 

[camdup]

This is a decent tech article.

http://www.sonnax.com/articles/408-...l-endplay-to-prevent-th400-gear-train-failure

I thought there was also a nice one from Chris at CKP.

 

[Crosley]

the .117 thick washer is a common used washer that I have used for decades. Never had a problem with sealing rings at the pump. If that washer brings the end play into a spec and all else inside the trans assembly was setup correctly. Run it

 

[Hutch]

Our max washer thickness is. 094" . You can check for intermediate shaft erosion where the ledge meets the front hub and where it meets the ring gear.
If that goes well, you can install a bearing between the hub and direct clutch drum, machine to fit. If that is too much, you can install a thicker washer available through Sonnax at the hub to fwd drum location. The last alternative is to use a torrington hardened bearing race which come in. 030" increments between the hub and fwd drum.


Hutch

 

[SLOCOUPE]

Our max washer thickness is. 094" . You can check for intermediate shaft erosion where the ledge meets the front hub and where it meets the ring gear.
If that goes well, you can install a bearing between the hub and direct clutch drum, machine to fit. If that is too much, you can install a thicker washer available through Sonnax at the hub to fwd drum location. The last alternative is to use a torrington hardened bearing race which come in. 030" increments between the hub and fwd drum.


Hutch

Thanks Hutch. I've scrounged a TH400 from a buddy that I can rob parts from. Is there a measurement for the intermediate shaft or is it just a visual thing?

I think for me the Sonnex washer would prob be the easiest if the other shaft isn't any better.

 

[Hutch]

The shafts are all very close in length. Hub erosion is quite common.


Hutch

 

[SLOCOUPE]

OK forgive my ignorance but is this intermediate shaft called something else? I'm looking at a exploded view so what number is it?

Be gentle I'm no trans guy..

 

[Hutch]

It's the shaft that the fwd clutch hub bottoms out on.


Hutch

 

[SLOCOUPE]

Gotcha

Thanks