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78 C6 Manual Shift Question

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Jul 18, 2016 | 11:38 AM

#1

MRStace84

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78 C6 Manual Shift Question

A friend of mine has a 1978 Ford Bronco with the C6 Tranny. With the tranny manually shifted into 1st gear, and the motor reaches somewhere around 5,000 rpm, the transmission will shift into second even with it manually shifted into 1st. This is truck is a off road only mud bogging truck and having it shift into 2nd while in the middle of a deep bit is not desirable. I have been told that this is something that these transmissions do. A feature to protect the motor from excessive rpms. My question is if there is a way that I can disable this, and force the transmission to stay in 1st gear when manually shifted into first? We did unhook the vacuum going to the modulator on the tranny, but it still shifted.

Thanks

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Jul 18, 2016 | 11:47 AM

#2

ManfredVonRichtofen

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From: SE Georgia

Quote:

Originally Posted by MRStace84

A friend of mine has a 1978 Ford Bronco with the C6 Tranny. With the tranny manually shifted into 1st gear, and the motor reaches somewhere around 5,000 rpm, the transmission will shift into second even with it manually shifted into 1st. This is truck is a off road only mud bogging truck and having it shift into 2nd while in the middle of a deep bit is not desirable. I have been told that this is something that these transmissions do. A feature to protect the motor from excessive rpms. My question is if there is a way that I can disable this, and force the transmission to stay in 1st gear when manually shifted into first? We did unhook the vacuum going to the modulator on the tranny, but it still shifted.

Thanks

Manual valve body is one thing you can do.

Then msd ignition with rev limiter

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Jul 18, 2016 | 09:08 PM

#3

MRStace84

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One possible culprit that we have learned is that this is happening because the kick down rod is not connected. Going to connect it and see what happens.

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Old

Jul 18, 2016 | 10:27 PM

#4

ManfredVonRichtofen

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From: SE Georgia

Quote:

Originally Posted by MRStace84

One porssible culprit that we have learned is that this is happening because the kick down rod is not connected. Going to connect it and see what happens.

Thats true. That needs to be hooked up...so when you stomp on it..it switches gears like it is suppose to

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