[sks72107]

I've decided to go another route on my 07 expedition. I've been rolling with a m5r2 trans for the last 5 years and 35k miles and something in the clutch system is not good. I also haven't been able to get 4x4, or cruise control working. So its time to change it up. I'm going with a 6r80 trans which is quite proven in the gasser world. So I have a few questions, I doubt the trans has been put behind a 4bt yet. Ill be machining the adapter plate myself. My current power is probably 225hp...assuming 450tq. The trans is easily rated for this from the 5.4.

Should I use a stock converter to get a baseline for how it will run? Will a stock HD flexplate be good for this application? Will a 5.4 starter start a 4bt?

Trans will be tuned with hp tuner.

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[Kubotaswapper]

I make the adapter for a 6r80 to mate behind a Kubota v2203.

Us shift make a controller for the 6r80 and currently beta testing a 10r80 controller.


I want to build a v2203/10r80 and swap into a jku.

I am following.

Find someone to build you a low stall converter. The stock gas unit is to high.

There is an aftermarket gear reduction mini starter available for the 6r80

 

[edpruss]

Converter needs to be taylored to torque curve of 4bt, not gasser. Needs to be able to provide adequate operating system pressure at that RPM, otherwise will not clamp bands properly and will fail.

Ed in Co.

 

[char1355]

The 6R80 has a maximum torque input of 590 lb ft. so it would handle the torque. Main issue might be finding a torque converter compatible with a 4bt. Destroked probably already had an adapter plate that should work and may have a flex plate as well. Their adapters use the Ford 6.0 diesel starter. You'd need to check with them on that. That transmission comes mated to small diesels in the Ranger truck line but doubt those have torque peaks the same as Cummins 4bt.

 

[sks72107]

Ok. Thanks guys. I'll be sure to get a proper stall speed on whatever converter I go with. Ill be calling destroked tomorrow to see if they have an adapter plate for this, I prefer to machine my own parts, so if I buy my own adapter it'll feel like sacrilege.....but time is important for this build. Did some research, and it looks like the target stall for the 4bt is approximately 1400-1600 ish rpm?

Detroked flex plates are really expensive, this I think ill make myself.

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[sks72107]

Just spoke with destroked and the woman I talked to claimed they don't make an adapter for the 6r80, but not going to lie she didn't sound very educated on transmission adaptes when that is what they speciality in.

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[char1355]

On the stall speed for a torque converter, most guys shoot for 1300 RPM. Full torque for a 4bt come on around 1700-1800 RPM.

 

[sks72107]

Talked to my converter builder tonight and he think he can build what I need for pretty reasonable. After that I can take a good look at the adapter thickness. Still not set on what flex plate as that kinda converter dependent. And the starter is kinda flex plate dependent.

Anyone know a common power rating on a 4bt starter? Would love to use a more compact starter cause space is so tight. I found that a typical 5.4 starter is about 160ft/lb tq.

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[Kubotaswapper]

Talked to my converter builder tonight and he think he can build what I need for pretty reasonable. After that I can take a good look at the adapter thickness. Still not set on what flex plate as that kinda converter dependent. And the starter is kinda flex plate dependent.

Anyone know a common power rating on a 4bt starter? Would love to use a more compact starter cause space is so tight. I found that a typical 5.4 starter is about 160ft/lb tq.

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There are gear reduction mini starter options for the 5.0/5.4l, not sure on ft lbs though.

 

[Vern]

I make the adapter for a 6r80 to mate behind a Kubota v2203.

Us shift make a controller for the 6r80 and currently beta testing a 10r80 controller.


I want to build a v2203/10r80 and swap into a jku.

I am following.

Find someone to build you a low stall converter. The stock gas unit is to high.

There is an aftermarket gear reduction mini starter available for the 6r80

How are these transmissions holding up behind the kubota? I am looking at using a 6r80 from the diesel ford ranger here in Australia behind an isuzu 4bd1t, but not sure on the longevity of the tranny. The torque pulses are whats worrying me.

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[Kubotaswapper]

Still in the testing stages. And building the vehicles just finished the adapter a couple months back but they should hold up fine. Need to find a low stall converter before we button stuff up

Ken

How are these transmissions holding up behind the kubota? I am looking at using a 6r80 from the diesel ford ranger here in Australia behind an isuzu 4bd1t, but not sure on the longevity of the tranny. The torque pulses are whats worrying me.

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[sks72107]

Project update:

Much time was spent on what combination of parts to go with. Ideally I wanted to start with a dodge/cummins flexplate, as that would bolt to the crank. But due to the large diameter of the dodge flexplate it wouldn't work with the smaller size of the bell housing on the 6r. So after eyeing some dimensions of other parts, ive opted to start with a 6.0 powerstroke flexplate and starter. The 6.0 flex plate just barely fits in the 6r bellhousing....not that that really matters. So I machined out the center section of the 6.0 flexplate and machined a new center section with the cummins crank bolt pattern. Since starting with the 6.0 flexplate, ill also be using the 6.0 base torque converter, as that will mate to that flexplate. Using the 6.0 flexplate will put that starter snuggly against the block.

Since I'm going with essentially a 6.0 converter it will actually stick out of the 6r bell housing because of the size of it. The 6.0 converter will of course get all the proper guts to make it mate to the 6r. My converter guy will hopefully have the converter done next week. So unfortunately because of the converter stick out, my trans to engine adapter will have to be about 3" thick. After I get the converter and everything this week I'll order my block of aluminum to machine the adapter.

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[Kubotaswapper]

A 6.0l torque converter will fit the 6r80?

 

[sks72107]

Alas, no. Hope that's not what I implied. My converter guy is starting with the piece of the 6.0 converter that mates to the 6.0 flexplate.....i believe this will be a forged aftermarket piece. From this he will build it with the proper mating guts that will joint to the 6r. Sorry I'm not up to speed on my converter lingo.

Does that clear it up?

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[Vern]

Alas, no. Hope that's not what I implied. My converter guy is starting with the piece of the 6.0 converter that mates to the 6.0 flexplate.....i believe this will be a forged aftermarket piece. From this he will build it with the proper mating guts that will joint to the 6r. Sorry I'm not up to speed on my converter lingo.

Does that clear it up?

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Are you having a trans built? If so, what mods have been recommended?

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[Kubotaswapper]

Ok yes I get it. On our Kubota adapters we use the stock flexplate, starter and torque converter. The nice thing will be you could also run a 10r80 with your setup when done. Still waiting for that controller to be released though

 

[sks72107]

Are you having a trans built? If so, what mods have been recommended?

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No, im going with a stock trans. I did contemplate a billet input shaft. This trans is rated at i think 490lb torque, and my setup should be right on the brink of that. Nothing ventured, nothing gained.

I plan on using hp tuners to tune the shifting of the 6r.

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[Vern]

No, im going with a stock trans. I did contemplate a billet input shaft. This trans is rated at i think 490lb torque, and my setup should be right on the brink of that. Nothing ventured, nothing gained.

I plan on using hp tuners to tune the shifting of the 6r.

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Cool, will be interested to see how it holds up.
590lb, or 800nm.
My concern is it lets go when i am in the outback (Australia), i would be putting out similar power with my 4bd1t, 120kw at the wheels. But the torque pulses of the big 4 cylinder is what worries me


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[sks72107]

Finally got my converter done. As I said its based on a 6.0 powerstroke converter with off the shelf guts from sonnax to have all the trans input shafts to mate with the 6r trans. Guy said it should be good for more power than what I'm making. Looking forward to getting my metal bought for the engine to trans adapter. I think the thinnest plate i can start with is 2.5" thick. Hoping to order my metal early next week and start maching next saturday. Here's some pics of the converter.

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[Snuggletough]

That is a seriously strange way of doing what you want.

That flexplate center thing you machined looks iffy. What is up with the big oops groove cut into the face? Are you a machinist or a hobby guy with a lathe and a mill?

When flexplates fail it's usually in the high stress area right where you put your weld. Welds done by hand are a bit iffy for stuff like this. Flexplates are rather intolerant of thickness changes like that. By design, it flexes, and flexes differently depending on load and line pressure (converter is basically a metal balloon).

Hope it works, but you have gone down a misguided rabbit hole IMO.