Does anyone really think the 4.5 will ever be put in the 2500 HD? With improved fuel economy over the 6.6 and a 2500 frame and brakes it might be the perfect truck for me. Prob a tow rating of 11 or 12k lbs. I have heard people mention this motor being another engine option for the HD, but no verification. Thanks for your comments in advance.

I think if you worked that engine hard in a 2500, you might not see a benefit over the 6.6, might even see less economy? Kinda like 6cyl vs. 4cyl jeeps, after big tires, towing, hills, the 6 was the wiser choice. Of course, talking diesels, who knows? GM test results would hopefully tell.

I could see it being a great choice for the 2500hd. I think the guys that dont tow much but really want the best of both worlds (able to tow a large camper but get great mpgs when not) would buy them. I know I would buy one if they were out. I dont really need a large truck all the time but when I do tow I know a 1/2 ton wont cut it at all. The unloaded mpgs the 4.5 should get along with the 310 hp or so and the towing capacity of the 2500 frame and suspension would be great for the average modern day truck owner.

Im hopeing that GM will put the 4.5 in the 2500HD as a base engine. with 310hp and 520ft/lbs of torque this engine will have more than enough power for the 3/4 ton as it puts out more power than the 6.0 gasser does and that engine has more than enough power for the truck if your not towing heavy. the engine should get much better mileage that the current 6.6 does and with aftermarket mods im hopeing 27-30 mpg will be a possibility but only time will tell. also the 4.5 engine will be much lighter than the current 6.6 so hopefully GM will offer plow prep packages with ext and crew cab trucks with the 4.5L.

The 4.5L will be more then enough for most of us. 10 years ago people towed big trailers and didn't have anything like the 4.5L power wise (Fords 7.3 comes close). We are spoiled by the big engines we have now.

I want a 4.5L in a 2500HD becuase when you are going down a 6-7% grade for 20 miles with a 8000lbs of trailer and gear pushing you, it's very nice to have the overkill in stability and brakes of the 2500HD. Sure a 1500 can do it, but I would crawl down those grades in a 1500. My 97 C2500 5.7L vortec can pull that load up those grades (although it's screaming in 2nd gear), so I don't need the power of the 6.6L Dmax. If I didn't live in such a hilly part of the country a 4.5L 1500 would do fine. I also want a CCLB, which you can't get in a 1500.

I've read from several sources that the 4.5 will be the base engine for the 2500

The 4.5 in the 2500 would be perfect for me too, although I'm the rare one that needs the payload capacity, not the towing. It would be good for all the service trucks with the service bodies also. Most of them probably never tow anything.

4.5- option in the 1/2 ton, standard in the 3/4, with the 6.6 being the optional upgrade. like the 6.0 gasser now. that would give us good chassis choices?

What sources say that the 4.5 will be the base engine for the 2500? I've heard people say this but no one states where they heard it or if it is just wishful thinking.

It seems hard to swallow telling someone: "Yep, that's the little engine that should 4.5L under my hood". There MAY be pros, but there WILL be cons. In the end, I'd rather have the biggest available in my truck, and I know I'm not alone.

Doesn't make since to me why would you not just buy a 1500Hd with te 4.5? I need all the power I can get though.

i can't see them putting the 4.5l in the 3/4 ton trucks that would take sales away from the 6.6 i can see the 1/2 tons because that is where the sales are at not the HD market right now

If GM is smart they will offer the 4.5 in 1500 and 2500hd trucks. It's already rated higher than LB7 and early LLY power outputs. Of course if they really wanted to they could bring back the 1500hd and regular 2500 models. But if the Duramax broke the diesel engine mold when it hit the market and it wasn't the biggest diesel out (Powerstroke 7.3) then we should expect a lot more from this engine then they are leading us to believe.

It seems hard to swallow telling someone: "Yep, that's the little engine that should 4.5L under my hood". There MAY be pros, but there WILL be cons. In the end, I'd rather have the biggest available in my truck, and I know I'm not alone.
X2

I dont think that GM will make it standard equipment in the 2500HD, mainly because of cost. Possible opotion but doubtful.

i will definately be buying one of these if they come out. perfect for me would be a 1500 with the 4.5 ccsb with 2500hd brakes. all my buddies who have driven my truck always say that they love the brakes. i dont really need a 2500 all the time because i love having a diesel for when i need to tow but it is also a great daily driver.

It seems hard to swallow telling someone: "Yep, that's the little engine that should 4.5L under my hood". There MAY be pros, but there WILL be cons. In the end, I'd rather have the biggest available in my truck, and I know I'm not alone.

I second that

I dont think the oil companys will let a truck that can get 30 mpg out on the market its funny how they can get a same size engine to get more hp and better fuel miles but they dont put them on the market:mad:

the oil companys dont own GM? how could they not let it come out?

offering the 4.5 along side the 6.6 in the 2500HD's is a stupid idea in my own dumb opinion. Why?

because [any] vehicle optioned with a diesel vehicle is substantially more expensive. The 6.6 dmax is what, a 7,000 dollar option now? Do you really think the 4.5 is going to be that much less expensive an option?

So hm lets see. Im in the market for a new 2500HD. Theres the base model inexpensive 6.0 gasser. But I want to tow a little, and have diesel torque and reliability, but I dont need to tow 18,000 pounds. Sounds like Im a perfect canadate for a 4.5-equipped 2500HD. SO I go to the dealer and go over pricing. The dealer says well if you want a diesel but are only towing 10,000lbs or so, the 4.5 would be a great choice. That will be an extra 6,000 dollar option over the gasser. Or you could spend a measly extra 1000 dollars for the 6.6 and have a much more durable and heavy duty (as far as internals go) engine with WAY more HP and torque. Sure I might not ever need the extra power a 6.6 has, but if Im spending $$$$$ on the diesel option, why not spend just a little more to have the best??

The 4.5 is not suited for HD use, end of story. Does it have the power? Yeah, ok so its the same hp as the LB7 when it came out. But its overhead cam (who wants to be changing timing belts/chains every 75,000 miles in their heavy duty work truck thats probably going to be abused and not maintained regularly), 72*, much weaker mains, rods, internals, etc... Not to mention the fact that there is no replacment for displacment. When towing equal loads the 310hp 4.5 is going to be working a crapload harder (and wearing out much faster) than a 300hp LB7. Not to mention fuel economy will probably be about the same. To account for the lower displacment, the 4.5 is going to have to work harder and burn more fuel to produce the same power that the driver requests. The result, if you could have a 4.5 2500HD, a truck that MIGHT get a few MPG better unloaded, but gets the exact same, if not worse, fuel economy when towing.

HD trucks are generally used as heavy work trucks. They get beat on, overloaded, abused, riden hard and put away wet. If GM offers the 4.5 in the HD's, many people wont even know or care about the difference, oh its a diesel, so I can work the shit out of it. They (people who dont know anything, the average Joe, ie, someone who has no idea what a diesel is, other than you dont put gas in the tank) will run it hard, the engines will fail and wear out, and before long GM will be right back to where they were with the 6.2's and 6.5's...."junk diesel engines, dont buy a GM diesel!!"

Everyone needs to step outside their "diesel enthusiast" and "someone who knows something about diesels and apprecaites what they have to offer" shoes and put yourself in the average Joe-worker who buys the truck, puts diesel in the tank, keeps it stock, and works it hard and doesnt think otherwise. Thats everyone on diesel forums' biggest problem. They cant get it through their head that not everyone in the world knows/gives a shit/apprecitaes things like a solid front axle, choices of diesel engines, etc.

just my opinion

Ben

DURAtotheMAX: "No replacement for displacement", nailed it IMO. Many 4.5 owners will start modding them for more power, as history repeats itself. You could spend the extra $1000 or so on the 6.6 option, leave it bone stock, keep it warrantied, and still make as much as or more TQ than $1000 into a modded 4.5L, now potentially a warranty issue. And you STILL will envy the big boys (especially if your a gearhead) openly or secretly, when you don't have to. And, $1000 extra stretched over 4 or 5 years is nothing really per month. Easier than buying $1000 worth of aftermarket warranty voiding add ons. Ah well, that's me anyways.

DURAtotheMAX: "No replacement for displacement", nailed it IMO. Many 4.5 owners will start modding them for more power, as history repeats itself. You could spend the extra $1000 or so on the 6.6 option, leave it bone stock, keep it warrantied, and still make as much as or more TQ than $1000 into a modded 4.5L, now potentially a warranty issue. And you STILL will envy the big boys (especially if your a gearhead) openly or secretly, when you don't have to. And, $1000 extra stretched over 4 or 5 years is nothing really per month. Easier than buying $1000 worth of aftermarket warranty voiding add ons. Ah well, that's me anyways.
Plus I bet resale would be better with the bigger engine.

IMO that'd be like ford going from the 7.3 to the 6.0.

I wonder how long it will take to have a programmer up and ready for the new 4.5

The 4.5 is not suited for HD use, end of story. Does it have the power? Yeah, ok so its the same hp as the LB7 when it came out. But its overhead cam (who wants to be changing timing belts/chains every 75,000 miles in their heavy duty work truck thats probably going to be abused and not maintained regularly), 72*, much weaker mains, rods, internals, etc...

Any real data to back up the much weaker mains, rods, internals, etc. claim? You don't need a 50lb sledge hammer to crack open a nut.

Any real data to back up the much weaker mains, rods, internals, etc. claim? You don't need a 50lb sledge hammer to crack open a nut.


yup. 2 bolts mains, etc, and there were pictures posted a while back of the 4.5 bottom end, it looks like a joke compared to the 6.6 dmax.

If i was going to have a 4.5l TD it would be in a mid sized truck with a 1/2 ton frame.

Slightly smaller (hopefully more nimble) truck with some sporty offroad equipment.... thinkin 'ZR3'.

It would be perfectly capable of dragging a boat through the mud and getting 30 mpgs on the highway, while weighing in at the same weight as a 1/2 gas 4x4.

Realistic? I don't know. A good idea? I think so. Probably cost prohibitive.

engine was not intended for HD, but from reading 6.6duramax is supposed is getting same or similar injection setup/system(HPCR, peizo injectors and cylinder pressure monitoring/control) and possible displacement increase. should be enough interest in auto's and light trucks for 4.5duramax, that was it's market slot. think with CAFE mpg standards gm will have to get this engine in lineup.

I am absolutely sick of the EPA. I'm never buying a new vehicle... i will build my own.

yup. 2 bolts mains, etc, and there were pictures posted a while back of the 4.5 bottom end, it looks like a joke compared to the 6.6 dmax.
Hey - the Cummins crowd says that about the 6.6 Duramax - yet they still seem to do OK.

DURAtotheMAX: "No replacement for displacement", nailed it IMO. Many 4.5 owners will start modding them for more power, as history repeats itself. You could spend the extra $1000 or so on the 6.6 option, leave it bone stock, keep it warrantied, and still make as much as or more TQ than $1000 into a modded 4.5L, now potentially a warranty issue. And you STILL will envy the big boys (especially if your a gearhead) openly or secretly, when you don't have to. And, $1000 extra stretched over 4 or 5 years is nothing really per month. Easier than buying $1000 worth of aftermarket warranty voiding add ons. Ah well, that's me anyways.

Did you ever think that some people want a diesel for the mileage aspect with occasional light towing and do not want the rough ride given by the 2500. Not everyone tows 15000 lb trailers and needs stiff rear leafs. True... no replacement for displacement, but there is a benefit when you look at power to weight ratios.

I would rather have a 6.6L but honestly... the 4.5L would be more logical and economical for my needs and everyday driving.

Did you ever think that some people want a diesel for the mileage aspect with occasional light towing and do not want the rough ride given by the 2500. Not everyone tows 15000 lb trailers and needs stiff rear leafs. True... no replacement for displacement, but there is a benefit when you look at power to weight ratios.


Don't they call the above a 1500 with a 4.5L?

I agree a 4.5L has a place.

We have a 5k camper that we tried towing with a 5.3L suburban and
the weight was not a issue but the motor and trans were working so hard to maintain a descent traffic speed that the motor kept getting hot and/or trans. Hince a 6.6L duramax. A 4.5L Duramax would be better for me if the motor and trans could handle moderate to heavy towing a few times a year and get 25mpg for daily driving. The 6.6L is a great vehicle even though it is a little tuff on mileage for daily driving. The 6.6L is a secondary vehicle for us.

I agree a 4.5L has a place.

We have a 5k camper that we tried towing with a 5.3L suburban and
the weight was not a issue but the motor and trans were working so hard to maintain a descent traffic speed that the motor kept getting hot and/or trans. Hince a 6.6L duramax. A 4.5L Duramax would be better for me if the motor and trans could handle moderate to heavy towing a few times a year and get 25mpg for daily driving. The 6.6L is a great vehicle even though it is a little tuff on mileage for daily driving. The 6.6L is a secondary vehicle for us.

Seriously. A Yukon, Burb, or Escalade with a 4.5 and about 9k lbs of towing capacity would be awesome!

Don't they call the above a 1500 with a 4.5L?


Yes,

I think the 4.5l/1500 and the 6.6l/2500 3500 have different places and should coexist no problem. Heavy duty and light duty diesels. Both have a market place

Of course they will also make the 2500's with the 4.5l because there's a guy out there somewhere who will want a truck with a workbox/camper/utility bed and not need to pull a trailer who would like to have the HD springs, but doesn't need more motor than the 4.5l to putt around the yard welding. Different strokes.
It's not replacing the 6.6l. If you NEED the 6.6l, buy it. If you're afraid you're gonna cheap out and end up over working your 4.5 when you shoulda got a 6.6l, don't get a 4.5l.
If you plan on towing everyday at the 4.5l's maximum towing capacity, you might ought to assume you need a 6.6l for the job.

For a comparison, there used to be tons of 4.3L v6's in full size extended cab pickups. They worked alright. They got some jobs done. The major difference? Most of them (over 7-8 years old) are off the road today. They didn't last as long as the v-8 powered trucks.

I would expect the same from the 4.5l vs the 6.6l

the 4.5 in a the 1500 trim would sell really well and thats the only way i see gm doing it.
Hell when it comes down to it i think gm wants to say "hey you can get 20mpg plus in a full size" that alone will sell it.

The 2500 trim i think will always have a gas option and a diesel i think.

Did you ever think that some people want a diesel for the mileage aspect with occasional light towing and do not want the rough ride given by the 2500. Not everyone tows 15000 lb trailers and needs stiff rear leafs. True... no replacement for displacement, but there is a benefit when you look at power to weight ratios.

I would rather have a 6.6L but honestly... the 4.5L would be more logical and economical for my needs and everyday driving.

I was stricktly speaking of the 4.5 in a 2500 (title of this thread). I think the 4.5 in a 1500 is a great combo for those who don't need or want the whole HD rig, but still want some beef.

i could see having somebeef for towing, problem is some bonehead if its 2500 with 4.5 will equate it to cheaper 25/3500 with 6.6. i've got guy's around here pulling 3 axle trailer with 30+foot boats, using 1500 with 5.3's and don't think nothing about it. i think for liability reasons 4.5 might go into 1500hd but that should be it.

yup. 2 bolts mains, etc, and there were pictures posted a while back of the 4.5 bottom end, it looks like a joke compared to the 6.6 dmax.

Every other engine GM has is a joke compared to how the 6.6 looks. Not every engine was made to go in a medium duty truck. How much torque do you need to make to break a stock 6.6 rod? It has to be a lot (close to 1000 ft-lbs, maybe more?). A 4.5 doesn't need that kind of stuff to be a good engine.

I was stricktly speaking of the 4.5 in a 2500 (title of this thread). I think the 4.5 in a 1500 is a great combo for those who don't need or want the whole HD rig, but still want some beef.


my bad. I doubt the 2500 will see the 4.5l if it comes out. Too many variations and models are what is killing GM and the truck market. It costs them a lot of money to mix and match parts.. this motor with that truck, with that trim, with those options. you get the point. the more variations, the more cost you have. I mean, do they really need a work truck, LS, LT1, LT2, LT3, LTZ? Look at toyota, work truck/base, mid level model, and loaded model. Its simple and keeps costs down.

seriously toyota and nissan both offer work truck, mid, loaded and it works and saves them alot of money i bet. Once GM starts fallowing their lead they will become a better company.

my opinion is 4.5 would be sweet for a 1500 and really really bad ass in a canyon/colorado or any midsize! could you imagine that!

my opinion is 4.5 would be sweet for a 1500 and really really bad ass in a canyon/colorado or any midsize! could you imagine that!

That would be bad ass, GMC currently offers the 5.3 in the Canyon as part of the sport truck option....I'd love to see the 4.5 as the performance option..... V8 power with 4 cyl economy. Its nice to daydream, but I'm sure it'd be rather cost prohibitive.

my opinion is 4.5 would be sweet for a 1500 and really really bad ass in a canyon/colorado or any midsize! could you imagine that!

That would be sick in a colorado!