Rebuilt transmission won't shift right

[Bronc937]

This is long winded so I apologize.....

I'm just finishing the build on my '77, with a C4, and during test drives it won't shift up into third. I thought it was the kickdown linkage so I disconnected it. No up shift. Then I checked to make sure I was making good vacuum at the manifold for the modulator and good pull. Also checked fluid level too.

Here's the funny part... It won't shift up in drive but when I put the lever in "2", it shifts up to third. What the (bleep)!!!

I figured it was probably the valve body so I took it back to the shop that rebuilt the whole transmission and the mechanic said it checked out fine and suspects I have the kickdown linkage set up wrong. He cited that partial pressure on it causes a malfunction.

Today I put it back together and still the same problem. I'm dying to drive this thing. Please help!


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[Viperwolf1]

There is a valve and pin under the modulator. The valve may be installed backwards.

 

[Bronc937]

I saw that mentioned in a mustang forum. Do I just pull the modulator and turn the pin around? Is there a certain way it should look?


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[Viperwolf1]

I saw that mentioned in a mustang forum. Do I just pull the modulator and turn the pin around? Is there a certain way it should look?


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Remove the modulator. The pin may stick in the modulator. The valve is the thing that needs to be in a specific way. It should go in like this. Pin is between valve and modulator. Be prepared for some fluid to run out.

 

[Bronc937]

Do think would also cause it shift into third when it shows in second? I appreciate your help viper. I knew you'd see this post.


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