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Excursion + Cummins 12 valve + Allison 1000

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How long have your conversion taken everyone? I am trying to get an estimated time line. I am looking at a 2003 cummins in my garage.



I been bouncing between projects. 1970 suburban, wanted to put a cummins in it. kept my diesel, sold the truck,



Corrado g60 to TDI conversion, almost done.



Now I have a crappy v10 excursion. Cant wait to get a diesel in it.



2wd v10 excursion to cummins 4wd.



Good luck with all your conversions
 
For those with info on the excursion, a question. I was looking around ebay and other places for where prices are on the gas excursions. Are all the excursions the same as far as the running gear?



I'd guess there is a difference in springs and stuff but what about the axles. The prices for the 5. 4 liter gassers are really low followed by the V10 of course.
 
The most obvious differences would be 4x4 vs 2x4. Same transmission (4R100) & rear end for the most part. Not sure what the rear ends are, Sterling 10. 25 or 10. 5, but gears will change based on engine. I believe all diesels 7. 3 or 6. 0 have 3. 73s. V-10s are likely to have 4. 10s, probably the same for a 5. 4. I think the pickups were the only ones with the option of 4. 30 gears. Too low if you're looking to swap in a diesel anyway.



I believe the 2002 up Excursions replaced the Dana 50 front axle with the Dana 60. I think the 2001 engines swapped over to powedered metal rods in the diesels, which are less reliable for major power upgrades. The Dana 50 shares most of the outers with the 60 but has a smaller ring gear. If you swap in a Cummins & wheel it hard off road, you may be better off with a 60.



Leaf springs will have different codes for each engine. Heavier the engine, heavier the springs. All 4x4 Excursions have awful suspension. Very little travel before hitting the front bump stops. Rear springs are weak & many suffer from too much body lean & axle wrap. In other words, your most likely going to want to upgrade the suspension no matter what.



If you plan to swap to a diesel, remember that a gas engine will not have the hydroboost brake system. Cost wise, if you can get a truck for under 10 grand, it is probably worth it if you don't mind making allot of changes. The diesels can rarely be had for around $15k, but it can happen.



Even though the 4R100 is way stronger than a 47 or 48RE, some are toast in less than 30,000 miles. It would be wise to throw in a really good torque converter & shift kit, no matter what the engine, drivetrain, tires, mileage, etc.
 
So are most folks doing conversions ditching or keeping the Cummins computer? Is it easier to get cruise, grid heaters & guages by matching up wiring harnesses or is it best to get rid of both vehicle computers & just splice the Ford gauges into the Cummins sensors?

Thanks,

Matt
 
I ditched the 12V computer because the engine doesnt really rely on it to run. I still have the V10 computer in my ford but it isnt needed for the engine to run. I spliced my ford gauges into the cummins sensors. I use the ford cruise control and moved it to the driver side fender along with the grid heaters. The grid heaters take some fancy wiring but if you have ever wired solenoids before it shouldnt be that hard to figure out. I use 2 push buttons for the grid heaters and another push button to start.



One question I have for others is how did you connect your throttle cable and cruise control cable up to the throttle on the P7100 injection pump. Mine works but Im not totally satisfied with it long term. Any ideas out there??



Chad
 
Matt, I haven't forgotten about you. . I've got a list of parts together that I think you'll need but man this is going to get expensive. The little details are what are going to cost the most.
 
I am very intrested to see how your going to wire this engine in. Will you be using your stock guage panal? I am looking at jeep swaps, and these wiring harnesses are troublesome to firgure out. In my case I would be using a mechanically controlled engine so things sould be easy to puzzle through. Any photos of your set up. Good luck, the cummins is miles ahead of the ford or gm diesels in my mind.
 
Pcs?

I haven't heard back from anyone about using an Allison 1000. Frankly, the new GM 6L80 sounds like a much stronger transmission, & i believe it will be able to be run with a manual automatic valve body, possibly able to ditch the computer. But i don't know that for certain.



Do i really need 5 or 6 speeds? What i'm thinking is that BTS can build the 4R100 to stand up to incredible amounts of power & abuse. Probably stronger than any of my other options. As long as it is programmed to shift into & stay in overdrive early, that should be satisfactory.



The 12 valve Cummins is built for low end grunt work, not to wind high, right? So if i get my shifts out of the way early on, i should be able to take advantage of the best fuel economy for cruising at mid speeds of say 40 mph & up. 3. 73 gears & 35" tires. I'm not a lead footed driver, even as much as i love big power. These days, i'm after fuel economy & reliability.



Baumann has a less expensive kit, but i came across a company called Powertrain Control Solutions, or, PCS. They offer electronic controls for most transmissions & engines, even harnesses. Would even control an overdrive like Gear Vendors. They will have a kit to control an Allison shortly, far cheaper i suspect than purchasing from Allison. It seems to be the most powerful transmission controller out there, would give me complete control with a laptop.



The other option is to simply control the shifts with a computer chip in the Ford ECU. In theory this should work but i haven't heard of anyone actually doing this. Most folks i've asked have left the factory ECU in place. Does anyone know if it will still be needed for the PATS system on a 7. 3 Excursion going to a '94 12 valve? Hopefully the 7. 3 will sell quickly, but i imagine the buyer would want the ECU as well.



The PCS kit requires a TPS. I'm pretty sure i can use Cummins parts for an auto transmission TPS mounted to the engine where the fuel pedal linkage will connect. I've been told to use a Ford Excursion gas truck fuel pedal & linkage to run the transmission. Fordcummins told me to use a gas Ex cruise control servo as well to hook up the cruise.



It is comforting to know that everything is doable. If i can't get everything working, speedometer, tach, etc, at least i know i can always make my own dash with custom gauges.



My Dana 50 & Sterling 10. 25 are coming out soon. Gonna try a wild 2006 coil conversion. Front 60, rear posi 10. 5. Used a plasma to cut everything out yeterday. Just had a wheel bearing go out on my 50, hope to get it swapped soon. I think i already found a buyer for my tires & wheels, but i'll still have the axles to sell.



I'm liking the idea of keeping the Cummins clutch & fan. I like engines mounted further back just for better vehicle balance. Since it is all mechanical, i'll keep it as low as possible for a good center of gravity. That should be better for the rear driveshaft angle too. May have to change the front driveshaft to something longer & stronger. The new axles use flanges instead of yokes at the axles. Most likely i'll just have to slide my crossmembers back a few inches, maybe make some minor adjustments.



If anyone has any advice or experience with these transmission control options i'd appreciate the advice. I'm not really interested in a Dodge transmission. I figure it is not only easier to keep my 4R100/NV273, but inately stronger as well. If i really feel the need for more gear later on, i can save up for a Gear Vendors down the road. 30% overdrive is still ballpark of the new 6 speeds by about 10%.
 
I have a 2002 ford excursion with the 5. 4l v8 4x4. I would like to use the existing transmission after having it built. The cost difference between building the trannys seems the same it just is expensive for the adapter to connect the cummins to the ford transmission. The adapter to connect the dodge transmission to the ford t-case seems alot cheaper. I won't be doing my swap till next fall. I will be curious to see some results.
 
Hi JR,

Thanks for the picture. Do you have more you can post? Most of the conversions i've seen pics of move both batteries to the driver's side. Did you relocate your vacuum collector? What did you do for a fan & shroud? Some say with an intercooler the Cummins will be fine with just an electric fan. Others say the Cummins needs as much cooling as possible, must run the clutch fan with shroud. Is the 6th valve cover still removeable on these trucks? Which transmission did you run behind it?



ISh,

I get what you mean about saving cost with the Dodge transmission. The 4R100 is, however, much stronger out of the box so i believe it more capable of lasting behind a Cummins. You'll spend about a grand just for the Cummins/Ford adapter & stand alone transmission controller. I'm not yet certain which transmission i will use. I just want to get it right the first & only time.



--Matt
 
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