Cummins powered Ford

[deserteagle71]

The Cummins B engine is the only medium-duty diesel engine used in pickups, Ford and Chevy diesels are light-duty engines.
The Cummins B engine is designed for use in garbage trucks, which is considered extreme-duty use. So it's designed much differently than the others built for rapid throttle response.

That Cummins is a great engine. I have two of them but both are in older trucks. If you want to read some horror stories go onto some of the Facebook pages for the new 2500 and 3500 Rams. The electronics problems are killing them and apparently the dealers can't fix them. Also, after so many years of building engines with solid lifters a couple years ago Cummins decided to go to hydraulic lifters - and those are failing at an alarming rate, destroying the engine.

Why I will NOT be buying a new one until they get all their problems figured out!

 

[RayIN]

That Cummins is a great engine. I have two of them but both are in older trucks. If you want to read some horror stories go onto some of the Facebook pages for the new 2500 and 3500 Rams. The electronics problems are killing them and apparently the dealers can't fix them. Also, after so many years of building engines with solid lifters a couple years ago Cummins decided to go to hydraulic lifters - and those are failing at an alarming rate, destroying the engine.

Why I will NOT be buying a new one until they get all their problems figured out!

That's a shame IMO. The B engine used to be a solid 300,000 mile engine in dump trucks.

 

[Paystar]

Theres a lot of Fords running around with Cummins in them, but very few Rams with Powerstrokes lol

Personally I like a GM in my Ford. LOL

And no, it doesn't leak all that oil. It actually doesn't even leave spots on the ground. It's been Krown oil sprayed all it's life for rust prevention and I just haven't washed it.

 

[jyoutz]

I gotta throw the BS flag on that. The ST tires are rated for 65MPH maximum continuous speed.

You get run over on I-40 if you don’t keep up.

 

[Hay Dude]

That Cummins is a great engine. I have two of them but both are in older trucks. If you want to read some horror stories go onto some of the Facebook pages for the new 2500 and 3500 Rams. The electronics problems are killing them and apparently the dealers can't fix them. Also, after so many years of building engines with solid lifters a couple years ago Cummins decided to go to hydraulic lifters - and those are failing at an alarming rate, destroying the engine.

Why I will NOT be buying a new one until they get all their problems figured out!

Ford, too. Pretty sure GM still using pushrod with solid lifters on the LP5, but I just read pages of problems they are having with oil starvation.
I agree hydraulic lifters is a step backwards, but they think it’s a step forward.

Overall, I can’t believe in 2026, none of them really seem to be able to get it right, and when they do, they move onto something else for either HP wars or improved fuel economy.

 

[Paystar]

Ford, too. Pretty sure GM still using pushrod with solid lifters on the LP5, but I just read pages of problems they are having with oil starvation.
I agree hydraulic lifters is a step backwards, but they think it’s a step forward.

Overall, I can’t believe in 2026, none of them really seem to be able to get it right, and when they do, they move onto something else for either HP wars or improved fuel economy.

I think the problem is the suppliers they all source their parts from, because every single manufacturer is having cam and lifter issues.

 

[TMGT]

I gotta throw the BS flag on that. The ST tires are rated for 65MPH maximum continuous speed.

You know you can buy ST tires with 80+mph speed ratings?

I don't drive that fast towing so I have tires rated for 75mph on my gooseneck trailer and 68mph on my dump trailer (it doesn't take trips on the highway anyways).

 

[ruffdog]

That Cummins is a great engine. I have two of them but both are in older trucks. If you want to read some horror stories go onto some of the Facebook pages for the new 2500 and 3500 Rams. The electronics problems are killing them and apparently the dealers can't fix them. Also, after so many years of building engines with solid lifters a couple years ago Cummins decided to go to hydraulic lifters - and those are failing at an alarming rate, destroying the engine.

Why I will NOT be buying a new one until they get all their problems figured out!

This is an interesting video on the new gen 6 Cummins. They have a used engine they are tearing down to see the differences of the new one. Towards the end they weigh the different blocks and they are close except the much lighter gen 5 CGI block. Also, the older ones were made in Brazil, gen 5 in Mexico, and the new gen 6 is from China.

 

[Hay Dude]

The Cummins B engine is the only medium-duty diesel engine used in pickups, Ford and Chevy diesels are light-duty engines.
The Cummins B engine is designed for use in garbage trucks, which is considered extreme-duty use. So it's designed much differently than the others built for rapid throttle response.

The 6.7L Cummins is also used in Ag tractors.
Pretty much says it all.

 

[QRTRHRS]

I put the "killer dowel pin" tab on my 97' 5.9. I had 350k on it when I sold it after loosing 5th gear again. As long as I ran about 1/2 qt low on the oil, it used very little.

There used to be someone on the TDR that had put an 8.3 in a Ford. He had heavily modified the frame to hold that weight.

 

[Dunno]

Why Stroke it when you can Ram it?

A good friend of mine has a deleted 3500 dually Ram. The recirculation and clogged exhausts kill the engine and mileage. Have you ever seen inside one of the cats on those trucks - the honeycomb mesh is so fine I doubt you could even breathe through one of them. Now he gets a real 21+ mpg on highway unladen.
The earliest Cummins engines no doubt were pulled off of their assembly line of engines earmarked for class 6 and 7 trucks. Later engines I think had lighter duty connecting rods, as the pro engine builders specify the early 5.9 rods in their 1500-3000hp builds.
CP3 to CP4 pump change is a debacle. Best thing for newer engines is to let them breathe, but not sure how it’s done with no-tamper features built in nowadays.
PS Tractor pictured in thread is a competition pulling tractor by looks of driver roll-cage.

 

[Hay Dude]

I had a 210HP 5.9L Cummins in a JCB farm tractor. Was talking to tractor tech about it. He told me they tore very few of them down. NEVER should have sold this, but money was tight and I wanted a CVT.

The Sisus are also an excellent engine. We have a huge AGCO dealership nearby and one of their more experienced tech's said it was rare to see a Sisu torn down under 15,000 hours

 

[Bob435]

Personally I like a GM in my Ford. LOL

And no, it doesn't leak all that oil. It actually doesn't even leave spots on the ground. It's been Krown oil sprayed all it's life for rust prevention and I just haven't washed it.

I am with you man! A Detroit 6V92 is a great engine will running a long time with sweet care. Easy starting in cold weather.

 

[walnutman]

Ford nor GM diesels compare when it comes to that Cummins rattle and roll. Bought my 2004 Dodge 2500 Cummins brand new. Still have the window sticker, bill of sale and the 2004 brochure. Paid $39k.. 4 door 4x4, SLT.

The best part is 2004 was the last year of no exhaust aftertreatment. The EGR was only in the cam profile.... and as they say... that cam was lost.

600hp 1200tq at the rear wheels today.

Yes I have put a ton of money in it over the years. Took a while to get the front end bulletproofed but it is. In the end it really wasn't all that much to get the front end there... bigger steering box, steering box brace, Synergy linkage system, Carli ball joints and a Thuren trak bar.
Using the original style single steering stabilizer with a Bilstein damper.

My biggest shot was 2003-2004 had a tendency to drop a valve seat. With the higher power.. bigger turbo and such, it did just that at around 150k. Bent a connecting rod and scored the cylinder wall. Cost me $15k for the entire job... R&R.. full quality rebuild... new performance F1 injectors, 100lb valve springs.. .020 bore with new pistons, Hamilton tow cam., BD high flow, two piece exhaust manifold.

The trans (48RE) had two rebuilds but neither was due to major failure.
First was done when I jacked up to 600hp. Had a Goerend built performance trans installed. I think that was around 65 or 75k miles.
I just had it refreshed last year at 215k miles. Overdrive was starting to blip a little.

At 22 years old this truck is in the classic realm. Living here now in East Texas I have a lot of young bucks eyeing it up.. lot's of Cummins fans around here. When you see the older diesels... it's most often Dodges. With the newer diesels it's a pretty even match around here with all three brands.

At the prices of new trucks today and the junk they are producing with all the garbage emissions on them...I wouldn't waste my money on ANY of them.

I'm driving the last diesel I'll ever own.

 

[jyoutz]

Ford nor GM diesels compare when it comes to that Cummins rattle and roll. Bought my 2004 Dodge 2500 Cummins brand new. Still have the window sticker, bill of sale and the 2004 brochure. Paid $39k.. 4 door 4x4, SLT.

The best part is 2004 was the last year of no exhaust aftertreatment. The EGR was only in the cam profile.... and as they say... that cam was lost.

600hp 1200tq at the rear wheels today.

Yes I have put a ton of money in it over the years. Took a while to get the front end bulletproofed but it is. In the end it really wasn't all that much to get the front end there... bigger steering box, steering box brace, Synergy linkage system, Carli ball joints and a Thuren trak bar.
Using the original style single steering stabilizer with a Bilstein damper.

My biggest shot was 2003-2004 had a tendency to drop a valve seat. With the higher power.. bigger turbo and such, it did just that at around 150k. Bent a connecting rod and scored the cylinder wall. Cost me $15k for the entire job... R&R.. full quality rebuild... new performance F1 injectors, 100lb valve springs.. .020 bore with new pistons, Hamilton tow cam., BD high flow, two piece exhaust manifold.

The trans (48RE) had two rebuilds but neither was due to major failure.
First was done when I jacked up to 600hp. Had a Goerend built performance trans installed. I think that was around 65 or 75k miles.
I just had it refreshed last year at 215k miles. Overdrive was starting to blip a little.

At 22 years old this truck is in the classic realm. Living here now in East Texas I have a lot of young bucks eyeing it up.. lot's of Cummins fans around here. When you see the older diesels... it's most often Dodges. With the newer diesels it's a pretty even match around here with all three brands.

At the prices of new trucks today and the junk they are producing with all the garbage emissions on them...I wouldn't waste my money on ANY of them.

I'm driving the last diesel I'll ever own.

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Actually 2007 mid-year was the last of the pre emissions 5.9 Cummins engines. Because I have one.

 

[Snobdds]

Actually 2007 mid-year was the last of the pre emissions 5.9 Cummins engines. Because I have one.

I'm not even a cummins fan boi and I knew that.

 

[walnutman]

Actually 2007 mid-year was the last of the pre emissions 5.9 Cummins engines. Because I have one.

Wasn't a CAT added in 2004.5?

From Google..
"The 2007 5.9L models also came equipped with a catalytic converter, continuing a trend that started in 2004.5."

 

[Rockbadchild]

fummings are common enough...

 

[jyoutz]

Wasn't a CAT added in 2004.5?

From Google..
"The 2007 5.9L models also came equipped with a catalytic converter, continuing a trend that started in 2004.5."

There is no DEF or DPF on the 2007 first half year 5.9 Cummins. A cat is no big deal.

 

[walnutman]

There is no DEF or DPF on the 2007 first half year 5.9 Cummins. A cat is no big deal.

Yes but a CAT is after treatment. My 04 did not come with one.
Its illegal to remove a CAT.
Here in Texas we have no inspection. A lot of people delete.