How hard would it be to make a 4l80e work behind the cummins? I've been told already that it would need an adapter to bolt up. Are these easy to come across or are they pretty rare. I just thought they would bolt up easy due to the fact chevy and dodge used the same nv4500 tranny, so I thought they would all have the same bolt pattern including the 4l80e. Just thinking about other options with the tranny. Thanks

 

The adaptor would be easy to find. Old fritolay and bread box vans with 4bts had gm trannys behind them often. I think it would be a good tranny behind the cummins. You would probably need a standalone controller for it depending on what year tranny it is.

 

the 4l80e will hold neary 800rwhp/800rwtq with just a shift kit installed. Parish ran his turbo 6.0 into 10's with a stock plus shift kit 4L80E. The gearing is close too, so there is minimal rpm drop between gears.

 

So the early 4l80e's don't need electronics to control them? It seems like more people would run these things as strong as they are. Sounds like it would be much cheaper than building a dodge trans.

 

Ill send my brother to this thread....he's a former chevy mechanic so he can detail on this one.

 

They can be made uberstout without too much trouble, as is they are pretty stout, they run them in the vans with the dmax (or did before the 6l80e showed up). They do need a stand alone controller (tci makes one as well as several other companies, google is your friend here.) but those controllers are kinda pricey. I love the 4l80 but i am partial to gm auto transmissions, as i feel they shift better, and are more durable and better designed than dodges, but i digress. I think the 80 would be good behind the ctd, but it can get pretty pricey to get one in there, the adapters are out there, but for some reason they tend to fetch a premium over the dodge and sae adapters. Also you would need a transmission with the classic gm bellhousing
(regular small block/big block) not one for a gen 3 engine as they have a different pattern. (although the later ones do have a removeable bell housing. I'm sure your completely confused now, but i tried to answer some questions. Good luck.

 

Thats why I pay you the big bucks to do my mechanic work ............

 

What would one do for an appropriate low stall TC? I bet a one of would be $$$$.

 

Well they put the 4l80e behind the 6.5 and like my bro mentioned the duramax in vans, so I would imagine one of those tc would work.

 

Lots of useful information! Thank you very much! This is something I may start collecting parts for now so when the time comes that the 518 craps out I will have something to take its place. Sounds like it would be something a little different also.

 

If my brother ever decides what he wants to do with his ol red 93gmc flatbed, his 4l80e may see power through a cummins.

 

There's people that make low stall converters for it, i came across them while surfing the web a while back, but i can't remember where. However some local transmission shops can custom build a converter to your specs, and some of them are real good at it too. There's one local around here that does a great job on custome converters from what i understand.

 

I for one would like to know how a 4l80e could be contoled? I have one in a 91 6.5L Suburban, and it went into limp mode.... 4L80E use "duty cycles" to control shift, as well as a RPM, VSS, and TPS signal. The ECM is out I think, SES on, won't code out anything? Would love a 4L80E for a Cummings switch. Any GM tranny gurus out here? Let me know.... Artie

 

#CGM. Cummins 4BT / 6BT to a Chevy 4L80E / 700R4 / 4L60E / TH400 transmission, billet aluminum transmission adapter and billet steel flexplate. Fits 2002 back, 2003 up available. We have a computer to control a 4L80E / 4L60E transmission. This Cummins adapter and flexplate Combo Kit is light years ahead of the used adapters on the market that don't fit correctly.

This adapter uses a 6 liter Ford Power Stroke starter. If your Cummins engine has a standard transmission flywheel now your flywheel bolts will be too long for the new automatic transmission flexplate. You will need new shorter flexplate bolts.

Other Cummins Adapters

http://www.transmissionsone.com/