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Old 03-09-2006, 12:32 PM
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4L80 non electronic

OK...So the 4L80-E is an electronically controlled overdrive model of the 3L80 (TH 400), basically. I've seen those transmissions sold as non-electronic, manually shifted units, though. Does that mean that you couldn't just put it in "drive" and go- you have to drop it in 1st, then shift to 2nd, etc.? Would that be the same principle as having an automatic transmission with a manual valve body and a ratchet shifter? So, did GM make any non-electronic heavy duty overdrive transmissions?

I was also wondering- If my current cam requires a stall, say 2500-3000, will I be able to drive at part-throttle, low RPM speeds (like around town) without screwing up my converter? I haven't bought a converter yet, 'cause I'm not sure if I'm going to swap cams. Thanks for any advice you can lend


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Old 03-09-2006, 02:55 PM
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The only way to make a 4L80E shift without the electronics is to install a manual valve body. It requires the electronic control to operate the shifts on its own.

You could install a manual valve body, put it in drive, and go, but you'll only have one gear and it would be drive. You would very shortly destroy the transmission.
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Old 03-09-2006, 03:06 PM
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Here is a link to a fully manual 4L80E trans.

Its shifted manually, 1,2,3,4 and good to a thousand hp! LOL
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