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Old 09-28-2015, 07:47 PM   #15
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Originally Posted by tjdonahoe View Post
the newer cummins are quiet,the conversion cost would be prohibitive in my view.....
...
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Old 09-29-2015, 08:35 AM   #16
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Mel, while you have the tranny out go ahead and pull the engine and drop a cummins back in it's place...

Humm??? Maybe it's time to pull the diesel trigger! I'd use 12 valve Cummins if I did. No computer, can re-program the 4L80e TCI for a diesel. Just put it in, hook up the throttle, fuel line, starter... Now don't that sound easy! I've got a notebook with all the 'what is needed' written in it somewhere around here.

Some years back I had every intention of doing a diesel. Almost bought a school bus. Went and looked that this school bus with money in pocket. As I looked at it and measured to see if it'd fit, I got cold feet and went home w/o. Think that was about the time I put the TBI system on the 454 and MPG went from 4 to 7.

I think I'm dreaming again.
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Old 09-29-2015, 08:40 AM   #17
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........... everything gets really quiet..... birds stop singing, the TV sound has to be turned right up, and everyone seems to be talking to you in very low tones, even though they look like they are shouting.
All I need to do is take my hearing aids out and all the above is true.
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Old 09-29-2015, 09:18 AM   #18
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Humm??? Maybe it's time to pull the diesel trigger! I'd use 12 valve Cummins if I did. No computer, can re-program the 4L80e TCI for a diesel. Just put it in, hook up the throttle, fuel line, starter... Now don't that sound easy!
There are some knock-on effects. Mainly rear axle ratio. 4.56:1 as opposed to usually something like 3.5 or 3.73:1 for most diesel trucks. You are removing an engine that likes to run at 2800 to 3500 rpm and inserting one that really prefers to be around the 2000 to 2500 rpm mark.

Then there is that gasoline-powered generator.......
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Old 09-29-2015, 09:34 AM   #19
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Not to mention all the little things like accessories including power Steering pump, AC compressor and alternator that have to be sourced/adapted. Like most jobs like this... It looks simple till you dig a little deeper into it. It's one reason a lot of "projects" get scrapped before they're completed.

I've thought about an 8.1L conversion in mine. Then I woke up and realized it just isn't going to happen. If I can find the right 345 Classic I might reconsider.
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Old 09-29-2015, 10:20 AM   #20
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...... and a vacuum pump, if you have the vacuum operated HVAC controls, which I think you would.
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Old 09-29-2015, 01:02 PM   #21
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...... and a vacuum pump, if you have the vacuum operated HVAC controls, which I think you would.
Yep, lots of vacuum needed and none from a diesel.
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Old 09-29-2015, 03:30 PM   #22
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my '03 7.3L is quieter since doing the fuel lines and some other mods.. even the wife noticed when we were driving around and I had not said a word.
I've got a 2000 F250 SD with the 7.3L.

Care to share what mods you made?!
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Old 09-30-2015, 05:21 PM   #23
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Originally Posted by Punch View Post
There are some knock-on effects. Mainly rear axle ratio. 4.56:1 as opposed to usually something like 3.5 or 3.73:1 for most diesel trucks. You are removing an engine that likes to run at 2800 to 3500 rpm and inserting one that really prefers to be around the 2000 to 2500 rpm mark.

Then there is that gasoline-powered generator.......

Well maybe, maybe not. I run about 2600 rpm at 70 in overdrive w/torque converter locked. 2600's not too bad to run a cummins at. 4.10/1 would be a better match, but not needed.
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Old 09-30-2015, 05:35 PM   #24
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...... and a vacuum pump, if you have the vacuum operated HVAC controls, which I think you would.
Get it from a Dodge and it will have a vacuum pump on it. My 2001 Dodge diesel does.

Maybe I need to start looking at craigslist for something '96-97.:<)

Now that's Crazy Mel talking.... But what is on craigslist????? Drat :<( Nothing. Maybe next time.

I've got the fever now!
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Old 10-05-2015, 10:06 PM   #25
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I doubt whether your tranny would be able to handle the torque of the Cummins engine. As well, gas engines typically red line at 5K. The '94 LY I used to have red lined at 2.5K.
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Old 10-05-2015, 10:22 PM   #26
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454 to cummins

It will work, but there are a lot of details that will have to be worked out, a lot of them.

Sometimes a fix in one place will lead to a new issue, but for a person who is dedicated to seeing it through, and willing to buy the parts that will make the swap reliable, it can be made rock solid.


Brevi tempore!
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Old 10-11-2015, 11:45 AM   #27
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...... and a vacuum pump, if you have the vacuum operated HVAC controls, which I think you would.
Mine doesnt have a vacuum pump on the engine. They use a little electric pump and a baseball sized reservoir to run the HVAC controls. I does have an air compresser for the airbags and brakes.
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Old 10-11-2015, 11:57 AM   #28
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Id find an engine/transmission combination. The Allison MD3060 is a real nice option. 4th gear is 1:1 fifth is 0.75:1 and sixth is 0.65:1. I believe the rear end is 4.10.

The Cummins ECM is built into the engine and very easy to interface with vs the computers they typically use gas cars and trucks which are integrated into the vehicle. They can be like doing a brain transplant. The Allison controller is also pretty easy to transplant. I can be done.
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