how strong is a stock 4L80? the application is a 2000 camaro gettin a 408 and in a year and a half (depending on bills being paid off) gettin a whipple 3.3 twin screw only running 8-10 PSI

 

Depends on the builder. One of the Ohio boys have been in the 7's with one.

 

a stock one meaning from GM performance parts, not built by someone

 

stone stock, maybe 500hp. transgo -2 kit 750hp. Same with a good build on stock hard parts, the input shaft is the first to go.

 

ok thanks for your input any others?

 

i rebuilt mine myself, no new hard parts, just good clutches, new bushings, couple minor updated bushings, and a TCI HD-2 kit, been in over a year now, made a few passes with the Procharged 403, makes 617 RWHP, had the pan off a couple times, no burnt crap anywhere
i use a 10" FTI converter

 

I've heard 800 from another forum member, just do the transgo 2 kit til it breaks.

 

slow67's post is correct.

500 is the limit on a stock one due to the apply area of the 3rd gear clutches.

The TransGo HD-2 Kit fixes this, or a good rebuild using the proper methods.

The next issue becomes the stock input shaft. It's USUALLY good for about 750-800 lb/ft of torque.
Some break behind stock 6.0Ls in towing applications, others live at 1000 HP.

A turbo car is easier on parts, N2O car is harder, so that fudges the numbers around.

You should replace the forward hub at the same time as the input shaft.
It is advisable to use both if using a transbrake.

 

i'm making my thread a favorite on my page lol

 

Wanted to add some questions in instead of making a new thread on the same topic hope ya don't mind. Ive searched and went through about ten pages of threads, some say use the alto clutches and kolene steels some say they are junk and to use the stock replacements from borg warner. So i don't know which to believe haha. Building mine to go behind a turbo 5.3l if that matters.

 

Alto reds are "OK".
They are marginally better than a stock tan Borg Warner clutch in a TH400, TH350, 4L80E application.
They seem to have SLIGHTLY better resistance to heat/slipping, but if they ever flare, they are DONE.
This is based on plenty of experience with the 200-4R's.
The 4L60E builders here can relate their experiences with them in the 3-4 pack of a 700/4L60E and the Alto Power Pack most of us tried when it was new.

You want to use a carbon graphite based clutch plate. Good shifting characteristics with excellent heat resistance.

 

I have a low mileage one Im planning to put in my turbo malibu, I also have a core I plan to have built... Im looking into convertors now...

 

don't mind at all! info always helps everyone out!!!

 

You know of a brand/company that sells a rebuild kit with those carbon graphite based clutch plates? Or who sells them individually? Thanks

 

also intrested

 

Only as good as the person who puts it together. I just had a fully built 80 take a dump after maybe 200miles...