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C3 Transmission not stock???? HELP

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Old Aug 26, 2021 | 07:27 PM
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Default C3 Transmission not stock???? HELP

I recently bought a 1969 427 390HP. I can tell the transmission in the car is not the original 4 speed muncie but I have no idea what transmission this car has in it. It seems to be cast iron and not aluminum like a Muncie. Would anyone from these photos be able to tell me what it has in it?






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Old Aug 26, 2021 | 08:06 PM
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Zoom in a bit closer. I think we will be able to identify it from the cast iron composition.

Or you could take a photo of the plate that the shift levers pass through.

This is all I got for the code: http://corvettec3.ca/trans.htm

Last edited by Bikespace; Aug 26, 2021 at 08:08 PM.
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Old Aug 26, 2021 | 08:52 PM
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The shape of the transmission may help too. Take some pictures from further out. Maybe somebody here will recognize it.
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Old Aug 27, 2021 | 06:59 AM
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Guessing a Saginaw or Borg-Warner, take a picture of the side cover and post it here.
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Old Aug 29, 2021 | 08:01 AM
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that number is 3925656....its a muncie from a 78 or 79. ITs an economy model. just found this from another thread and remembeered your post about a cast iron muncie
http://www.hunt4cleanair.net/Articles/fourspeeds.pdf

Last edited by Rescue Rogers; Aug 29, 2021 at 08:05 AM.
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Old Aug 29, 2021 | 08:04 AM
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Originally Posted by MikeyMike33
I recently bought a 1969 427 390HP. I can tell the transmission in the car is not the original 4 speed muncie but I have no idea what transmission this car has in it. It seems to be cast iron and not aluminum like a Muncie. Would anyone from these photos be able to tell me what it has in it?

thats what those 2 numbers look like to me
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