Thread: C-6 Movement Issues

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Hi, I'll try and explain this as best i can, if i miss anything, let me know.

I've got a late 60's or early/mid 70's C-6 hooked up to a 68 Ford 390 BB. I bought the engine, tranny, and married t-case (the gear driven one, i think its the np205). Though I bought them from teh same person, I bought them seperately.

I had a NP435 with a divorced NP205 in there (factory 77 Highboy F-250). Loved the combo, But for mud racing, I needed an auto. So i bought the tranny from my buddy. He hadnt touched it, save for taking the slap shifter that was on it. I put on a B&M Z-gate on it, adjust it well, and shifted perfectly.

Now, This is the tranny/t-case that came off of the motor, So i figured everything would be hunky-dory, right?

Well, i guess i was wrong. Bolted it on, got the engine warmed up (engine was freshly rebuilt as a spare), and shifted out of park. Engine died. Started her back up, and QUICKLY went to neutral. Went to First and it just went PUT PUT put PUT *dead*. It's getting plenty of vaccuum to its valve thing, but thats only needed for Drive, right? Not reverse or First/Second?

If i punch it AS or BEFORE i shift, it will go into the gear i choose, and move no faster than 3-4 MPH, and never more than 1000-1250 RPM.

The t-case is in Hi-Lock (full time), And i only have 4.11 gears. I'm going to assume it's the transmission, since the engine is in perfect condition (mechanic verified), and the rear/front and t-case were rebuilt at the same time.


Anyone have any ideas? Thank you very much!
Dave

Dave I'm not sure about yours But I know some of those were electronic.
I don't remember what year they switched though.
I've got a freind that know all about them, so let me call him tomarrow,
and see what he says might be the problem.
I had problems myself with the married tranys and T - cases.
I ended up with a divorced set up.
FMX and old dodge gear drive T - case behind that, no more problems after that.
Kurt

This is very true, I never though of that. Thank you.

Are there any diagnostic tests i can perform? Or signs to look for that might indicate what the problem is?

Or should i just take it out and take it to my local shop?

My freind seems to think the trany is bad he thinks it's a sprage. Kurt