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12-11-2021, 03:03 PM | #1 |
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Join Date: Aug 2020
Posts: 442
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289 K-Code Automatic Transmission
Does anyone have a K-code/w C4 automatic? If so, at what rpm are your WOT shifts?
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12-11-2021, 06:15 PM | #2 |
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Join Date: Oct 2014
Location: NE Iowa
Posts: 1,664
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Re: 289 K-Code Automatic Transmission
Wish I could answer your question. Will follow to see if someone posts. The K codes have a special governor listed in the parts book. I tried to order one back in the day but was unavailable.
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12-11-2021, 08:08 PM | #3 |
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Join Date: May 2010
Location: The Inland Empire of Washington State
Posts: 368
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Re: 289 K-Code Automatic Transmission
I had a '66 K Mustang with a C4 years ago, at WOT it went to about 4800 rpms. Today you can get a governor kit for a C4 that includes a housing, springs and weights at Dynamic Racing Transmissions
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12-11-2021, 11:39 PM | #4 |
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Join Date: Aug 2020
Posts: 442
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Re: 289 K-Code Automatic Transmission
Thanks, Craig.
I've been communicating with Matt (Dynamic Racing Transmissions) regarding their governor kit. It comes with 3 weights-11.5 grams, 12 grams, and 12.5 grams. The 12-gram weight provides WOT upshift at approximately 5800. Each .5 grams change will move the rpm up/down 200. Matt said that springs aren't included because they're not necessary. The housing normally comes with 12g weight installed, but you can request that the 11.5/12.5 be installed in the "Comments" section of the order form. |
12-12-2021, 07:59 AM | #5 |
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Join Date: Mar 2012
Location: Ohio
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Re: 289 K-Code Automatic Transmission
Isn't a K usually a first generation mustang? 5,800 RPM is a lot. Especially in a car as light as that. So does the 1/2 gram more move the shift point up (higher RPM), or down?
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12-12-2021, 12:29 PM | #6 |
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Re: 289 K-Code Automatic Transmission
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12-12-2021, 01:07 PM | #7 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,436
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Re: 289 K-Code Automatic Transmission
With springs being the same tension, it takes a lighter weight longer to react than a heavier one. Folks that sell governor mod kits likely just furnish them with new springs to insure proper operation as long as the springs are the correct tension or compression as originally intended.
Folks loved to put different torque converters and B&M shift kits in there back in the day. Most were wanting better street performance but some were drag racing with them for sure. |
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