White98Z

iTrader: (3)

I have a Th350 with vig 3600 in the car right now with rev valvebody and love it but i can not get over about 20 miles with out it geting to hot. I dont drive it very much at all but when people are meating up and i cant get there becuse of tranny getting hot.I need lock up. So what i am asking how strong are the 4l80E And what all is involved it getting one to work. Or is there anyother options for me to go to.

1a-play

iTrader: (9)

I have one in my 98ss - not to bad to get it in there

White98Z

iTrader: (3)

How much power can they hold up to?

parish8

iTrader: (6)

Alot!!

i have a stock 4l80e other than a shift kit and ran a best of 10.91 and weigh 4700lbs.

jxaxsxoxn

iTrader: (2)

I got one in my 5500+ pound dually thats rated to tow up to 10,000 pounds. It only has about 400 something foot pounds of torque. That trans would hold up better in a lighter vehicle even if it had twice the power.
The only drawbacks to using a 4L80E in your car would be the electronics. You could get a stand alone computer to shift it but they are expensive (close to $1000), or you could get a TransGo shift kit that converts it from electronic shift to full manual shift and no computer, Not sure if it retains lock up.
Plus a 3600 converter for a 4L80E is going to run over $1000 too.
And for a general idea a core 4L80E thats not guaranteed rebuildable goes for $300-$400. Around here anyway, compared to $40 for th400's, 700R4's etc.
So a built one (or even rebuilt stock) is going to cost close to $2000+.
The rear gear train is almost identical to a th400 up to '99, in '99 the gears were made a little stronger.
Don't even think of getting a '91 or '92, they are junk. Get a '97 and up, easily identified by the cooler lines, one in front and one towards the middle of the trans, not in the regular location.

White98Z

iTrader: (3)

The price of the converter will be the same is the yank that i use to have in my 4l60e and the overall price of the rebuild should be much more then a 4l60e and after going through so many of them this might be my only way out and still be able to drive the thing everyday(well on the weekends) Why couldnt i just use a wireing harness and computer out of a chevy truck that uses the 6.0 with the 4l80e and cut and splice it to fit.

parish8

iTrader: (6)

if you do the work your self the price of the swap is comparable to a built 4l60e.

my experience is with a built $2000+ 4l60e and a stock 4l80e(+shift kit). the 4l80e is stronger and cost less. a used 4l80e is around $1000 with a 3 month warrenty at a junk yard. then another $1000 or so to get it in. It would be easy to get the tranny into a 1/2ton 2wd truck for $1000 but i am not sure about into a car.

here is a page for a 4wd truck that i put together. it doesn't really apply to you but you might find it interesting. http://www.neufamily.org/4l80e/4l80swap.html

1a-play

iTrader: (9)

I have the full manual conversion from trans go- I have a manual lockup switch for it also. I've run alot of 10's with it and I'm sure more could be handled. the converter was the same price as a good 60e converter

jxaxsxoxn

iTrader: (2)

You might, I have no idea what it takes. I've heard rumors that some earlier diesel trucks use a stand alone computer just for the trans, seems one could be found at a junkyard for cheap. BUT I've asked everywhere online and no one can verify this information and I forgot where online I've read that.

BUT I think (not knowing the specifics of your car) you could use the wiring for the same type of car you have that came with a 4L60E and it will have all the right wires, harnesses and plugs in almost all the right places.
The 4L60E to 4L80E plugs are almost identical except the 60 has two extra wires.
I'd go with that.

White98Z

iTrader: (3)

Well the car was a 6 speed when i got it, then i i swaped it for a 4l60e and wiring harness now i have the 6 speed wiring harness back in it with the th350 so swaping that kind of stuff is no big deal. I mean i could most likley just get the wiring diagrams and figure wish wires are diffrent from the 2 and go from there becuse the computer should be the same between a the 6.0 and the 5.7 and then i could just add those wired in and re pin the plug in if needed. But it would be nice just not to hook up a computer at all and have it all manuel and then switch for lock up if at all possible.

parish8

iTrader: (6)

no idea if this place is any good but you might be interested in their full manual set up. >> http://www.transmissioncenter.net/4L80E.htm

White98Z

iTrader: (3)

Thanks for that web site might just have to get a few things from them. Plus they have the plug in to stick a 4l80e in a 4l60e car.

parish8

iTrader: (6)

go strait to speartech for the harness, it will be alot cheaper. but make sure they can reprogram for ya before you order it. i think i paid $150 for the harness including the reprogram http://www.speartech.com/

you should check out my swap page, this info is on there http://www.neufamily.org/4l80e/4l80swap.html

Aries

if you're gonna do this Jef, then let me know and you can have my old B&M lock up switch.