4L80 Conversion

Drivetrain discussion including Transmission, Differential, Driveshaft, and related items.
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Joshua27
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Joined: Mon Aug 19, 2019 10:14 pm

4L80 Conversion

Post by Joshua27 » Sat Nov 30, 2019 7:35 pm

Has anyone done a 4L80 conversion on a PPV to date? I am in the process of doing it right now. Just have some questions on driveshaft if anyone has.

Ilikemtb999
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Joined: Thu Feb 07, 2019 5:49 am

Re: 4L80 Conversion

Post by Ilikemtb999 » Sat Nov 30, 2019 8:50 pm

Just curious, why?

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kevink
Posts: 426
Joined: Sun Aug 09, 2015 5:55 pm

Re: 4L80 Conversion

Post by kevink » Sun Dec 01, 2019 12:13 am

Ilikemtb999 wrote:
Sat Nov 30, 2019 8:50 pm
Just curious, why?
It's a much stronger transmission, you can have a transbrake, the tuning is probably easier (I stay away from only the most basic 6L80 tuning), a lot of high powered don't need the crazy-low first gear ratio of the 6L80, and they're cheaper.
Last edited by kevink on Sun Dec 01, 2019 12:27 am, edited 1 time in total.
2011 9C3: 11.48 @118.

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kevink
Posts: 426
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Re: 4L80 Conversion

Post by kevink » Sun Dec 01, 2019 12:16 am

Joshua27 wrote:
Sat Nov 30, 2019 7:35 pm
Has anyone done a 4L80 conversion on a PPV to date? I am in the process of doing it right now. Just have some questions on driveshaft if anyone has.
I know plenty of G8 guys and SS guys have done it. Did you have to beat the tunnel or make any other permanent mods to make it fit?
2011 9C3: 11.48 @118.

Joshua27
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Joined: Mon Aug 19, 2019 10:14 pm

Re: 4L80 Conversion

Post by Joshua27 » Thu Dec 19, 2019 2:09 am

I haven’t gotten to fitting it in the car yet. The block is at the machine shop right now. When I get it back and together it will be going in. Looks like the drivers side tunnel might need to be dented a little for electrical plugs. Oh and the reason I am doing the 4L80 conversion is because they are much stronger much cheaper to build handle more power. I blew my 6L80 and to have one built is close to $5,000 for the rwhp I will have. I had a 4L80 with a fresh rebuild and shift kit and 3,500 stall. Only other mod I know of will be my driveshaft going to make it a one piece.

Capeasy
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Joined: Thu Aug 08, 2019 2:16 am
Location: Downey, CA.

Re: 4L80 Conversion

Post by Capeasy » Sat Dec 28, 2019 9:38 pm

How much power were you putting out that took out the 6L80?
Walt (AKA:Capeasy) So. Cal.
2013 Caprice 9C1,Huron white, 99K, Blackbear tune, Spectra CAI, 3.45 Diff, deep trans pan. BlackWidow Venom exhaust,Granatelli oval cutouts, Doug
Thorley tri-Y headers, Pedders coilovers,Tower brace,

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