GM 4.8?

Yeahs or nays? Experience? Looking at a `12 CC,SB,4X4, 4SPD., 3.42. Is there a big difference between this setup and a 5.3/6spd.? Is the 4L60E more reliable than it Was?
 
I would think it would be slow and not likley to hurt a 4l60. How heavy would you anticipate the truck weighing when loaded, and would you plan on pulling a trailer? How fast would you want to cruise on the highway? A 5.3 6 speed would probably get at least the same gas mileage and far better performance.
 
4.8L (2012)
305 ft-lbs @ 4600
302 hp @ 5600

5.3L (2012)
335 ft-lbs @ 4,000 rpm
315 hp @ 5,200 rpm

Not that much of a difference

30 ft-lbs 600 RPM earlier and 13 hp 400 RPM sooner is noticeable, especially loaded pulling a hill. That truck will be much happier with 4.56's than 3.42's...
 
4.8s don't have that junk DOD.

Never met an owner who liked their 5.3/6spd truck or SUV. They hunt for gears constantly and are DOGS around town and on the highway. Most have 3:42 or lower gears due to the 6 speed.
 
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Are you guys comparing diesel engine to gas (petrol, benzine)?

4.8L is what I'm looking for, ideally in a 4WD "shorty" schoolbus

or maybe forestry truck, or firetruck?

Capable of modding to tow a 15K lb loaded trailer

anyone knowing how to go about searching systematically for such a beast, I will throw money at you to help me
 
Are you guys comparing diesel engine to gas (petrol, benzine)?

4.8L is what I'm looking for, ideally in a 4WD "shorty" schoolbus

or maybe forestry truck, or firetruck?

Capable of modding to tow a 15K lb loaded trailer

anyone knowing how to go about searching systematically for such a beast, I will throw money at you to help me
The OP is comparing 2 gas engines from the GM LSX family used in 1/2 ton pickups.
 
The 4.8 is just a smaller 5.3 really. Very reliable LS platform engine.

I honestly don't think the 4L60E is a bad trans. Failures are often due to overheat and dirty fluid (like many transmissions) and people changing gears without coming to a full stop (back up and then going to drive while in motion).
 
OK thanks. I want to stick with gas.

Got my wires crossed, the one I want is the 8.1L

as used in Kodiak / Topkick midranges, say up to C7500 ? I think retired there maybe 2008?

example forestry trucks seems to have manual 6-speed, dunno what model box or diff.

Sometimes the PTO / hydraulics available from the cherry picker or dump.

But lots pricier than the school buses, have yet to see 4WD, why I was thinking of wilderness fire trucks.

Also used in Suburbans, but not sure their chassis / suspension up to it.
 
Better than a 4.3, lags behind the 5.3.

The 8.1 is s good motor, plenty of low end grunt, but don't plan on winning any races...lol.
 
My service van has the 4.8 with the 6 speed trans, I have it loaded up pretty good although I've never weighed it. Plenty of power for merging with traffic and the "hills" we have in Kansas. If I were pulling a trailer or loaded heavier I'd want the 6.0.
 
My service van has the 4.8 with the 6 speed trans, I have it loaded up pretty good although I've never weighed it. Plenty of power for merging with traffic and the "hills" we have in Kansas. If I were pulling a trailer or loaded heavier I'd want the 6.0.

We have a high top 2500 van with the 4.8... It's tolerable when the van is empty, absolutely gutless when towing an enclosed trailer.
 
When shopping for my Tahoe around 2003 and 2004 I drove both a 5.3 and a 4.8. To me there was a noticeable difference in the performance which is why I bought a 5.3 version when I found one. She can certainly "scoot" when need be, even being 18 years old.
 

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