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So what is hard about it and how many have you done?
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Duramax vs Cummins HMMWV Conversions
- Thread starter erasedhammer
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Done, also 4X4nuts is making duplicate posts
goobie
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This is when I was finishing up the swap. Got @40k miles on it since then, No regrets
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Do you have any more photos of the conversion? if so please post!!
Also what trans and transfer case did you use? Was that a mechanical Cummins or common rail?
goobie
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I made an album on Facebook BUT I have since been evicted from Facebook. I will start with uploading pictures
duramax is the easier of the two swaps. I went the cummins route because i have seen a lot more cummins engines with 800k+ miles than a duramax. i have been making a living as a mechanic for over 35 years, I have owned my mechanic shop for 21 years. I always prefer to work on a cummins than a duramax just from a simplicity standpoint.
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What makes it more difficult than a Dmax conversion, is that an Allison trans?
goobie
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2006 the civilian H1 Alpha came with a duramax , So the mounts and brackets are available. All the Cummins mounts are custom made. That is one reason it is more difficult.
Yes 6 speed allison
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I was not aware anything was available, I believe all those parts have been sold, there also would be no cross member because the Alpha used the 4L80 trans.
There is however some adapter plates to adapt the Dmax to the original motor mounts but some other mods need to be made as the engine sits higher on those adapters, they come from some guys that are sticking Dmax motors in old chevy Impalas
What transfer case is that? that is an interesting looking adapter.
Also how are you controlling the Allison, that is a mechanical 6BT yes?
goobie
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The 2006 H1 alpha had a 5 speed allison. The transfer case is an modified humvee 242 , it has a clocking ring to get the angle right for front driveshaft. The alison TCM is in one of the pictures, it is mounted in the battery box under the seat. 6BT with mechanical P pump.I was not aware anything was available, I believe all those parts have been sold, there also would be no cross member because the Alpha used the 4L80 trans.
There is however some adapter plates to adapt the Dmax to the original motor mounts but some other mods need to be made as the engine sits higher on those adapters, they come from some guys that are sticking Dmax motors in old chevy Impalas
What transfer case is that? that is an interesting looking adapter.
Also how are you controlling the Allison, that is a mechanical 6BT yes?
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So the TCM does not require any information from a ECM? was it originally driven by a mechanical engine?
I was led to believe the GM TCM needed the ECM to work, I have communication between the ECM/TCM and the TCCM, I love the shift on the fly transfer case and am dang glad I did not install the mechanical transfer case I had bought because I thought it would be easier and no doubt it would have
What gear ratio diffs do you have?
VERY nice build
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PM sent
goobie
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The 242 is a mechanical transfer case. Alison TCM does Not need much to be "stand alone" . I'll include more details and were i got stuff from in the new threadSo the TCM does not require any information from a ECM? was it originally driven by a mechanical engine?
I was led to believe the GM TCM needed the ECM to work, I have communication between the ECM/TCM and the TCCM, I love the shift on the fly transfer case and am dang glad I did not install the mechanical transfer case I had bought because I thought it would be easier and no doubt it would have
What gear ratio diffs do you have?
VERY nice build
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deadlydayne
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What electric fan/shroud combo did you use?
I have an ECV so my rad is a little bigger, but I've been lookin for an electric fan setup for it for some time and everyone recommends the Lincoln Mark VIII/ Ford Taurus.
Also in regards to the electrical, did you convert the whole V to 12 volt or did you keep it 24 volt?
goobie
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Sorry for late response, I used a 2 speed cooling fan from 1999 ford crown victoria. Get a Good one , the dorman Chinese junk quit after 2 years. i got a motorcraft replacement.
i changed the entire truck to 12 volt , because it is easier to find 12 volt parts on a road trip. I am starting a post that will have a lot more in depth details about things i did to mine. I'll link it to yopu when i get it figured out
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deadlydayne
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No problems. I used your photo in a Google image result and found the crown Vic was the best match. I ended up going to a wrench apart and found one and threw it in mine. Since my truck is an ECV though, it only covers about half of my rad. If I have cooling issues in the Texas heat this summer I’ll find something else but currently it’s working. Currently trying to figure out what to do about my wipers and AC setup. I rewired my truck to 12volt as well and those are the final items that need changed for me.