My experience with GM diesels is with the 6.2 in a Suburban. Very poorly designed engine. Too small of an oil capacity (6qts), leading to a very short oil change interval, plus if you try and convince it to not get run over on the highway cold, it puts all the oil in the heads and starves the bearings. Also, you have to undo the injector lines to take off the valve covers. Who does that?
I currently have a Ford/IH 7.3IDI n/a swapped into my 69 F250, and it's a much better engine. Smoother, far more power, and easy to maintain. It also has a 10qt pan, so it's much easier on the oil. That Suburban was hard pressed to do 60 on the level empty, the F250 will do 70 pulling a 5,000lb trailer with room to spare.

I'd be very hesitant to try a new GM diesel product.

Back in '01 I used to drive a '93 GMC 2500 4x4 with the 6.2. It was a work truck owned by my employer at the time (USN). I would have gladly traded my Lincoln Town Car straight across for it, since the truck actually drove quite a bit nicer than the car, and straight line performance was similar. Of course, that's comparing a 100,000 mile '86 Lincoln to a 10,000 mile '93 mil-spec GMC. The only faults I could find with the truck were the automatic transmission (I strenuously prefer a manual) and the lack of AC (I was stationed in MS at the time), and the Lincoln suffered from the same issues.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

My farmer/diesel mechanic freinds said with the 6.2 you needed the 373 rear end. The 410 caused the engine to run too high rpm and cracked the main bearing webs. they said they never saw a cracked one in a truck with the 373 gears.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

there in lies your first problem.every 6.2 or 6.5 i have had holds 8 qts of oil.and as for the IH 7.3 they are as is the cummins a medium duty engine,the 6.2 and 6.5 are lite duty.so to compare them is like comparing a fiat to a ferrari.BUT the one thing GM had that the other 2 didn't is they put diesels in half ton pickups.and this my friend is where the failure of the US big 3 comes into play.i DO NOT need 500H.P. in my pickup,i want milage.i need a pickup or suburban to haul my machines,which weigh about 350 lbs and take up most of the bed.and GM was the only one offering a diesel.my 92 to this day with 600,000 miles still gets over 25mpg.GM,ford and dodge all talk of small diesels for pickups but they have been talking about it for 10 yrs and still nothing so evidently they are still trying to win the H.P. war.as someone mentioned earlier.ask any prius owner why they bought one and the only answer you will here is"they get great milage"not they will smoke the tires for 3 blocks and pull a freight train.the first company that brings a half ton diesel back into the market will make a killing.

Excellent point!

I love my cummins but wish it were available in about 2/3 or 3/4 scale. Less weight less size less power better fuel economy but still would tow enough for me.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Supposedly GM is working on a 4.5L diesel V8 for there new trucks and its going into the 2016's.

I'll beleive it when I see it.

Knowing GM if they do introduce it in a half ton it will only be available in the loaded $50k crew cab short bed configuration. I can see GM doing something stupid like that.

Sadly IMHO its to little to late. Modern EPA emissions have ruined diesels and taken away all their advantages.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200