4L80 Conversion
4L80 Conversion
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.
Re: 4L80 Conversion
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 Sat Nov 30, 2019 6:27 pm, edited 1 time in total.
2011 9C3: 11.48 @118.
Re: 4L80 Conversion
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.
Re: 4L80 Conversion
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.
Re: 4L80 Conversion
How much power were you putting out that took out the 6L80?
Walt (AKA:Capeasy) So. Cal.
2013 Caprice 9C1,Huron white, Blackbear tune, DOD Delete, Texas Speed stage 2 cam with all the goodies, Circle D 258 mm converter, 3200 stall. Spectra CAI, 3.45 Diff, deep trans pan. BlackWidow Venom exhaust,Granatelli oval cutouts, Doug Thorley tri-Y headers, Pedders coilovers,Tower brace, Widend OE. rear wheels to 10" wide with 295 Nitto's
2013 Caprice 9C1,Huron white, Blackbear tune, DOD Delete, Texas Speed stage 2 cam with all the goodies, Circle D 258 mm converter, 3200 stall. Spectra CAI, 3.45 Diff, deep trans pan. BlackWidow Venom exhaust,Granatelli oval cutouts, Doug Thorley tri-Y headers, Pedders coilovers,Tower brace, Widend OE. rear wheels to 10" wide with 295 Nitto's