TH400 winter upgrades

[turbobitt]

Been working real hard this fall to help raise some money for winter upgrades. Been wanting to try a 2.10:1 gear set for some time and also decided to take some rotating weight out with the 7075 aluminum forward and direct drums.

So far it looks to be a 12.5lb rotating weight savings between the drums and gear set.
AG


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[turbobitt]

Have the aluminum drums just about all set up for install. Found out nothing is ever a direct drop in. Had to fab up some spacers and support bushing for my direct drum stabilizer.

Was also a little board and looking to make some improvements on the valve body side. One thing I noticed is that the manual valve looks a little too restrictive for me when installed in the bore so I made some modifications I'll be testing this spring.

So far my switchable stall is still working great and making a few more refinements that required me to make up a new valve body. May have some more pictures coming soon.
AG.

 

[pacecarta]

cool stuff

 

[turbobitt]

This is the completed valve body. This is simply a modified CK trans brake with my switchable stall modifications. The aggressive filling of the passages is really not necessary but I prefer to do it to remove any chance of cross leaks and eliminate dead volume to quicken up the response and shifts. I also been testing a new center support with a larger apply piston and found the extra volume required to fill it during a shift needed the passage feeding it to be opened up some.

I know it sounds like a broken record but Chris has been working on his TH400 book and dedicated to finishing it soon. The valve body modifications will be detailed in there to make the switchable stall.
AG.

 

[fastblackracing]

Looks very nice tubobitt, does this change second gear ratio or does it stay the same? I always wondered about a glide in one of these cars, but my car is too much of a street car to do it. Some time ago when my car was high tens, I was having a second gear start issue with the 200r4, and the car only lost a tenth in the sixty foot and got me to thinking.

 

[turbobitt]

Looks very nice tubobitt, does this change second gear ratio or does it stay the same? I always wondered about a glide in one of these cars, but my car is too much of a street car to do it. Some time ago when my car was high tens, I was having a second gear start issue with the 200r4, and the car only lost a tenth in the sixty foot and got me to thinking.

The 2.10 planetary changes second gear from 1.48 to 1.40 and first from 2.48 to 2.10. My thought is in a heavy car a glide may be a little to much. For me I'm getting consistent wheel spin shortly after launch and believe this will help and also allow me to leave much harder. The converter will work much harder in first gear and generate more heat but that won't be a problem.
AG.

 

[chris718]

The 2.10 planetary changes second gear from 1.48 to 1.40 and first from 2.48 to 2.10. My thought is in a heavy car a glide may be a little to much. For me I'm getting consistent wheel spin shortly after launch and believe this will help and also allow me to leave much harder. The converter will work much harder in first gear and generate more heat but that won't be a problem.
AG.

Maybe you should turn down the boost. LOL.It is funny how I have looked at that manual valve for years and never saw the restriction.I believe that will be an improvement as well as the .028" orifice feed of int . oil to the direct clutch passage.

 

[turbobitt]

Maybe you should turn down the boost. LOL.It is funny how I have looked at that manual valve for years and never saw the restriction.I believe that will be an improvement as well as the .028" orifice feed of int . oil to the direct clutch passage.

Chris,
Please call me when you have a chance. I would like to know if you really think that's a good idea and if so what feed orifice to start with. My only concern is that while the T-brake is applied there will be an oil bleed into the intermediate circuit and back out the manual valve and may be to much demand on the T-brake oil supply passages to make up.
While studying this concept, I notice that the case gasket side had holes for this but none of the separator plates of VB gasket side had mating holes. It has me curious.

And I almost forgot, Thanks for being a great supplier and helping me out with the parts.

AG.

 

[turbobitt]

This is another picture of the manual valve in third. The oil must flow from the top passages(Forward), through the cube passage(Intermediate) and around the valve cut features and into the lower 3rd supply passage. As restrictive as this may look, the cube area was milled out to remove the casting draft and improve flow. I took this one step further and measured the actual manual valve position when installed in the case in each gear and inspected the position on the bench to get a visual on the connetions. I probably can make some small improvements but at this point I'm done making chips.
AG.