4L80 modulator
Thread Starter
Registered User
Joined: Dec 2015
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4L80 modulator Having problems with my 4L80 transmission. Mechanic friend said to disconnect the modulator and shift it manual.
I concerned that this will not work or will damage my transmission.
Any input will be appreciated.
I concerned that this will not work or will damage my transmission.
Any input will be appreciated.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I don't believe there is such as thing as a 4L80, they are all electronically controlled 4L80E.
If you have a "modulator" that means the electronic valve body was replaced with an aftermarket vacuum controlled one for manual shifting. Since it appears you have automatic shifting, you don't have a "modulator". However I might be missing or misunderstanding something.
Therefore, why not tell us exactly what you have - vehicle, year, and mods, etc.
If you have a "modulator" that means the electronic valve body was replaced with an aftermarket vacuum controlled one for manual shifting. Since it appears you have automatic shifting, you don't have a "modulator". However I might be missing or misunderstanding something.
Therefore, why not tell us exactly what you have - vehicle, year, and mods, etc.
Staging Lane
Joined: Jul 2012
Posts: 58
Likes: 2
You can add a vacuum 48-mod kit to any 4l80E and still retain electronic automatic shifts. To have manual control on a 4l80e, you can wire it up internally to do so or, you can buy an external manual control box to achieve this.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
