Well im looking into the Cummin conversion, and i have no clue where to start, so im gonna ask, is there an adaptor plate out there to bolt up a cummins to my 4L80E??

or would i be better off replaceing the entire drivetrain over and not using my stock trans & T case.

Moved to 4l80E forum

There are adpater plates. But your best bet is with one of those bread trucks. They have a 4 cylinder cummins diesel and there transmission is dimmensionaly the same as the 4l80e. Since the 4bt and the 6bt share the same bellhousing, you can take the 4bt bellhousing and bolt it onto the 6bt. Then bolt the bellhousing to the 4l80e. I'm 99% sure this works. Its a hell of alot cheaper than buying those adapter plates.

Personally I would scrap the 4l80e and put in a 47rh. They came with the 94-98 year Dodge Cummins. If you can find a donor truck in the boneyard somewhere you can pull the whole assembly and save alot on picking parts here and there. 4l80e can be built ot handle the cummins power, but should you go for anything high like 600 or 700 hp that Cummins will rip the 4l80e in half. 47rh can be built to take whatever power that cummins is throwing out. Just for an example- the guys with 1800hp 12V cummins run a full billet 47rh IIRC... Of course this is what I would do. If your just running thecummins with minimal power adders you can get the 4l80e built up a little better from the 6.5 to take the additional power. Best of luck.

Theres a few members in the 6.5 section that have done CUMMINS conversion's, and most all of them have gone the DODGE tranny route. The infamous bread truck adapter puts a 7 degree slant on the engine in those applications which can create clearance issues in the trucks. DESTROKED makes an adapter that will bolt it up straight, but the price will make you think twice. Also the controls for the 4L80E and it's weakness's in stock form normally make the 47RH a more viable option. The 6.5 and ANY OTHER VEHICLES sections is where this one should go for those who have experience in this matter.

he's currently asking about a 4L80E trans adaptor. since thats the precise topic of this thread, it shall remain in the 4L80E forum.

if he so chooses to go a different route, then the OP would be advised to open a NEW thread in the correct area of the forum. since it would have nothing to do with 6.5 engine tech or 4l80e tech at that point, OT/Other Vehicles would be more appropriate forums.

-Peter

he's currently asking about a 4L80E trans adaptor. since thats the precise topic of this thread, it shall remain in the 4L80E forum.

if he so chooses to go a different route, then the OP would be advised to open a NEW thread in the correct area of the forum. since it would have nothing to do with 6.5 engine tech or 4l80e tech at that point, OT/Other Vehicles would be more appropriate forums.

-Peter

I just simply stated where the people with first hand knowledge of this post and frequent is all, nothing more nothing less.I researched this topic before on this forum and those are the sections where I found technical information that would help me. As my sig states I went another direction, but trying to help another member to find the info that he needs.

I just simply stated where the people with first hand knowledge of this post and frequent is all, nothing more nothing less.I researched this topic before on this forum and those are the sections where I found technical information that would help me. As my sig states I went another direction, but trying to help another member to find the info that he needs.

Fair enough, I thought maybe you were taking a shot at the fact that I moved it here.

I can't remember the user name but I do recall seeing a thread on this conversion before. any ideas ferm? a quick PM should help him out a lot!

sorry for the misunderstanding, no harm no foul?

-Peter

JKAUTO has his done with a 47RE in his as he found out how costly the 4L80E was to adapt over to the CUMMINS. I don't remember his name, but there is another member with a black dually that used to post in the 6.5 section that did a conversion as well. And somewhere in the ANY OTHER VEHICLES there is an old post about some members who swapped 4L80E's into there DODGES but were having issues with em holding up.

If you want to run a 4l80, get it from Suncoast. It will survive as there are tons of aftermarket parts for the 4l80-4l85's.
I think most who go with the 47re do it bbecause it's a proven package and bolts right up.

Being moved again, to the Frankenstein Forum

I believe one the guys name was "Cperry" who did the cummins swap right in the middle of the 6.5 forum. Only reaons i remember was cause there where a select few who where leaving smart remarks about it and didn't "appreciate" it being in the 6.5 forum... They don't seem to post here anymore come to think of it...

Anyways it may not hurt to pull him up and find the thread he made. Had pictures and everything and it may be able to shed light on what tranny he used... good luck

http://www.dieselplace.com/forum/showthread.php?t=279711 this one I believe

yup thats it. since he had an NV4500 he was able to just switch the bellhousing and input shaft and it mated right up to the cummins. I don't know if a manual is out of the question, but it may be something to consider if you uestion the life and age of your current 4l80e.

Also, to help you out on your swap: The guys over at 4btswaps.com can be alot of help too. Best sight IMHO for anybody even thinking of doing a cummins swap. Be it a 4bt or a 6bt

Op, keep an eye out on Ebay. I have been looking for the the adapter I saw on there, but dammit i can't find it now.

FWIW, the Grumman (spl?) 2wd Bread Vans in 94-95 had the 4bt Cummins with the 4L80e trans. That is where you can find the adapter plate. I've seen a few, with all the changeover parts, go for around $600 in a no reserve auction.

Ebay user "partsforless83" parts out those bread vans and usually has the adapters every month or so.

If you run the cummins adapter, you will need either tilt the transmission 8 degrees or the engine 8 degrees. I use www.destroked.com (http://www.destroked.com) they have adaptors and motor mounts. Besides, I know the guy who builds their motor mountts:)

If you run the cummins adapter, you will need either tilt the transmission 8 degrees or the engine 8 degrees. I use www.destroked.com (http://www.destroked.com) they have adaptors and motor mounts. Besides, I know the guy who builds their motor mountts:)

lol hows that one of yours holdin up??

I sold that truck to member in OK. He loves it and is planning on a sas soon. I am working on an 05 Silverado Cummins Conversion as we speak.

lol hows that one of yours holdin up??

It's working out well. Now I just need to put the Allison in!

my buddy has a 4bt in a 95 burb with the 4l80e and is gathering all the goodies to go with the dodge trans. just can't get the gm trans to shift to his liking the cummins comes on so low of rpm.

My guess is that he his using the wrong converter, with the stall too high. I would bet he is probably using the stock GM TCM that has the wrong strategy for use with a Cummins.

i agree about the amount of stall on the converter. also the shift points aren't early enough and they hang on to long. i know its all just things . but i agree on using the early dodge trans. would have made alot less issues with the whole thing.

I have a 4BT in a '95 'burb w/4L80 trans. I had to modify the shift tables to make it shift right. It works great with the factory computer. I mounted the rpm sensor from the 6.5L in front of the crank pulley, and welded a throttle cable linkage onto the accel pedal. Been running it over two years now.