4L80E, front hubs and srw conversion

[bubba]

Hey guys I have a question to throw out. I was thinking of putting a 4L80E behind my cummins (way in the future) and was wondering if anyone has done this or heard of doing it. I had one behind my built twin turbo 6.5 chevy and it made my 518 look like a slush box. Or even a step further with TCI's modified 4L80E to be a six speed. That would be interesting...

Next question, and I didn't know if it went here or not, but one of my aluminum lock-in hubs on the front was turned to scrap dust when the previous owner was pulling out a stuck tractor and he bought two new hubs and sent em with the truck. The only problem is they won't work with the retaining ring that holds em into the hub. Does anybody make a different retaining ring or do I just need to modify them?

And lastly, my truck is a dually and I would like to convert it to single rear wheel. What all is involved? It looks to me like new hubs for the front and I'm home free but I don't know for sure.

Thanks guys!

[oldestof11]

I wanna put one behind a Cummins eventually. You will need the computer from an early 4L80E truck (92-93?) because they are stand-alone. Later ones are integrated into the truck computer. Also, around 96 or 97 they changed the style of plug for the transmission wiring.

[bubba]

TCI makes a standalone TCM for it if nothing else. I know it would be easier to go to a 47RE but every one I've driven or rode on it seems to hunt gears and it appears to cost more to build it up but its probably the same. I wonder if a bell is available for this swap...

[dazedandconfused]

I dont know anything about these guys but may go talk to them and Rossler about the 4l80E myself.
http://www.extremeautomatics.net/4l80estage2-2.aspx
These guys are suppose to have a bolt on Bellhousing that will bolt a 4l80E straight to a Cummins.

[bubba]

1350 hp sounds awesome but how much torque I wonder... and what about the other end? How to hook the tranny to the transfer case?

[dazedandconfused]

How to hook the tranny to the transfer case?

All my trucks are 2wd so it doesn't matter to me.

[bubba]

Yeah but I do so it does matter to me haha... with yours being so light you could probably get by with a BUILT (and I mean BUILT) 200-4R or 4L60. They take a lot less power to turn making your truck faster and get better mpg.

[dazedandconfused]

The 4l80E has trouble staying together with the tq so i doubt I'd run anything less. Rossler rates theirs at 1850hp.

[oldestof11]

Another option for a computer is using the Megasquirt EFI ECU modded to run the 4L80E. You can write your own tunes for shifting and even add in a "manual" option, like flappy paddles.

[bubba]

flappy paddles? hahaha

[turboram]

Ive built 47rh's that can hold way more power than you will put out and shift nice. I wouldn't go through the trouble of converting to a 4l80 those things have trouble holding up to 6.5s!! There are tons of parts to make the dodge tranny hold up to more power

[bubba]

I had one behind a twin turbo 6.5 with just good clutches and bands and it never gave any trouble and I wasn't easy on it either. I'd smoke 35's everytime I came to a stop haha... And I know 47's can be built for it but a 47 never came in my truck either so its gonna need fabrication and lastly I've never liked the way 47's shifted. I have a couple of buddies that have em in their trucks, both built professionally, by different vendors, but they both seem to hunt for gears, short shift and stuff. The only thing consistent about it is that its inconsistent. But thats just my two cents.

[DodgeFreak]

I just built one for my cousin (stock clutches with shift kit) and it doesn't hunt for gears. it took me a few trys to get it to shift how i wanted but if its hunting for gears the valve body isn't set up right.

[ellis93]

I just built one for my cousin (stock clutches with shift kit) and it doesn't hunt for gears. it took me a few trys to get it to shift how i wanted but if its hunting for gears the valve body isn't set up right.

Or cable adjustment is wrong, gov issues on rh models/sticky weights/worn housing.

4l80s can take some power,big block street burner power, but I'd doubt you'd have it hold up to the Cummins. Saying that it held up behind a 6.5 so it should behind a Cummins is like saying an orange tastes just like liver. The power bands is way off between the to engines,really that's the only similarity between the two, they're engines and that's it. In top form I think the 6.5 produced 300ft pounds of torque at like 1700RPMs,that Cummins has that off idle.

[bubba]

Read it again. It was a twin turbo 6.5 that dyno'd over 500 hp at the wheels. A little north of 800 ft lbs. So your orange does taste like liver if you try and put it that way.