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4L80 trans swap

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Old Dec 30, 2025 | 07:11 AM
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Default 4L80 trans swap
I have an 81 C3. I am putting in a 4L80 transmission. Has anyone else made this swap and if so what crossmember are you using for it. I really need the help.
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Old Dec 30, 2025 | 08:00 AM
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Originally Posted by Blackvette70
I have an 81 C3. I am putting in a 4L80 transmission. Has anyone else made this swap and if so what crossmember are you using for it. I really need the help.
G-Force makes one

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Old Dec 30, 2025 | 12:28 PM
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Call SST ( Silver Sport Transmissions) great customer service. I used them for a TKO swap.
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Old Dec 30, 2025 | 04:13 PM
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I second G-Force.
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Old Dec 30, 2025 | 04:45 PM
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Just a question. Why a 4L80E which is fairly large instead of a well built 4L60E? Big HP engine?
I did a LS1/4L60E swap on my 71 C3. Zero tunnel mods.
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