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Discussion Starter #1
I’m a Ford guy and would like to use a Ford tranny in my conversion but I’m worried that i will not be able to find a electric 4speed tranny that will not work good with the low power curve that the 4bt‘a have. I’ve heard that the dodge trannys can be programmed to shift good on the 4bt’s But I’m not really wanting to hear all griping about using dodge parts lol
 

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Not really an automatic specialist but there have been several Fords done on the forum. From all my reading, the best 4 speeds were the E4OD and better yet the 4R100 which came behind diesels. The 5R110W is also a possible. Member A310 is using that one with good results. Adapters are available to mate any of those to a Cummins. It's just not exactly cheap. For example, Destroked has adapter plates for $795, flex plates for $625, and the starter for $179. That's $1599 to adapt the transmission to the engine. Then you need an outboard controller which will range from $649 to $949 depending on brand. There will also be some sensors needed and a torque converter with around a 1300 RPM stall. You'd be looking at near $3000 just to install the transmission. Should you have a Cummins with the small block Ford adapter it is possible to use that and either the Cummins flex plate setup or a better aftermarket unit made by member RubeBonet. The Ford 4 speeds were available in the small block bolt pattern. Most of the automatics we see are the Dodge ones mainly because of cost and ease of adapting. The Allison 1000 also came behind the 4bt and that's another possible. The Allison 2000 and 3000 series were often found in medium duty trucks. Is this a 4wd? That can complicate things sometimes.
 

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Big, I'm currently working on a trans swap in my 07 expedition. When I did the 4bt conversion roughly 6 years ago I went with the m5r2 manual trans. Many creature comforts still didn't work after hours of work, so I opted to revert back to the original style trans. In with the 6r80!! As far as I know, this trans has never been tested behind a 4bt(this has been a tough row to hoe, btw) No one makes an adapter to connect the 6r80 and cummins, so I had to machine my own. The hunk of aluminum alone was 400$. Had a custom built converter based on a 6.0 made, 800$. And I scored a trans for about 200$. So with other odds and ends im in this for about 1600 so after adding a few other things. The 6r will be tuned with hp tuners programmer. (A310 pointed me in this direction, he loves this programmer) that programmer will also aid in turning off other inputs/outputs that would throw codes. I honestly expect good results with this trans after time working the tuning.

The 6r80 is rated for about 500 torque and has 2 overdrive ratios! And the aftermarket has a lot to offer for this trans.

I dont know what your looking for or what model year fords your thinking of, but another dream I've had is a mechanically injected vt275(v6 powerstroke). If you went with that power plant you could run the 5r110 or 4r100. I've always wanted to build me a mechanical vt275, if you want any details on that P.M. me.

Sorry to ramble on.

Sent from my SM-G970U using Tapatalk
 

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Discussion Starter #4
We’ve done acouple swaps with the zf5 and m50d (we’ve been thru 2 ) I have one with a e40d but I don’t like the way it shifts. I know they make good programmers for the 4r70e but not really sure on the Ford trannys
 

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The 4R70e probably has enough torque capacity to handle a normal 4bt. Max torque is 516 lb ft. One issue you may get into there is the bellhousing. They may be modular instead of small block Ford. The 4R75e which replaced it is a bit stronger at 553 lb ft. Don't know that we've had either of those used behind a Cummins.
 
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