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Old July 14th, 2009, 10:58 PM   #21
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they make avalanches in 1/2 ton and 3/4 applications. Depending on how much you plan on pulling, the 3/4 ton may be a better option for you, and you can get them in gas or diesel.
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Old July 15th, 2009, 07:04 AM   #22
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i think that you need a 02 with the 8.1 468 cubic in monster.
That's 496.
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Old July 15th, 2009, 07:27 AM   #23
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they make avalanches in 1/2 ton and 3/4 applications. Depending on how much you plan on pulling, the 3/4 ton may be a better option for you, and you can get them in gas or diesel.
no you cant, the avalance was never availably with a diesel, if it was I would have bought one. The reason it was never available is the trans tunnel isnt big/high enough without the 2" body lift the 3/4 ton HD's have to clear the allison trans. the put the duramax in some later vans but they have a 4l85e trans and are detuned quite a bit from a pickup version.

you can get an 8.1L 2500 avalanche but it's going to suck... leaf sprung rear, crappy mileage, etc. it's a 3/4 ton gas truck.

a 1/2 ton avalanche is a great choice.
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Old July 15th, 2009, 08:11 AM   #24
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no you cant, the avalance was never availably with a diesel, if it was I would have bought one. The reason it was never available is the trans tunnel isnt big/high enough without the 2" body lift the 3/4 ton HD's have to clear the allison trans. the put the duramax in some later vans but they have a 4l85e trans and are detuned quite a bit from a pickup version.

you can get an 8.1L 2500 avalanche but it's going to suck... leaf sprung rear, crappy mileage, etc. it's a 3/4 ton gas truck.

a 1/2 ton avalanche is a great choice.
He is 100% correct on the 2500 Avalanche. My boss is actually swapping a Duramax into an Avalanche right now because they never made one...
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Old July 15th, 2009, 08:25 AM   #25
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as far as 5.7 or 5.3 go with the 5.3..... they make more power, something like 300 HP as opposed to the lethargic 5.7 that is making like 215 or something rediculous like that.
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Old July 15th, 2009, 08:58 AM   #26
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as far as 5.7 or 5.3 go with the 5.3..... they make more power, something like 300 HP as opposed to the lethargic 5.7 that is making like 215 or something rediculous like that.
Vortec 5.3: 285-295 HP, 325-335 ft-lbs
Vortec 5.7: 255 HP, 330 ft-lbs

Just for accurate number purposes.
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Old July 15th, 2009, 09:24 AM   #27
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Vortec 5.3: 285-295 HP, 325-335 ft-lbs
Vortec 5.7: 255 HP, 330 ft-lbs

Just for accurate number purposes.
Thank you for posting the accurate numbers. This is why I think the 350 is a great towing motor. although it has less hp, the torque is the same. It isn't as fast, or as efficient as the 5.3 but it would still pull a hefty load well.
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Old July 15th, 2009, 09:53 AM   #28
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I have owned trucks with both motors, and would not buy another one with the 5.3. The 5.3 seemed very weak compared to the 5.7. Just my .02..............
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Old July 15th, 2009, 10:00 AM   #29
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I have owned trucks with both motors, and would not buy another one with the 5.3. The 5.3 seemed very weak compared to the 5.7. Just my .02..............
I think that goes back to the "low" torque curve that the older style motors had.
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Old July 15th, 2009, 10:03 AM   #30
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Just an FYI and I'm not exactly sure what years it applies to but there is a TSB for the oil pump O-ring and it's a big job to replace it. We had to change it in my Brother in Laws 03 Silverado because he had NO oil pressure. The first thing I checked when I bought my 05 was that. It doesn't apply to the 05 5.3 in Silverados.
Please elaborate. I would like to know which years are affected and what it take s to change it, if you don't mind. thanks

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I have owned trucks with both motors, and would not buy another one with the 5.3. The 5.3 seemed very weak compared to the 5.7. Just my .02..............

Don't hear that much?? Also, 5.3 = no dizzy.
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Old July 15th, 2009, 10:06 AM   #31
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I towed my Jeep to harlan with a 5.3

I got about 13 MPG Towing
I got about 17 MPG not towing. I seen as high as 19 not towing.
It towed fine with the 5.3
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Old July 15th, 2009, 10:31 AM   #32
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i see as high as 22 mpg in my truck, but the 5.3 is gutless when towing anything heavy (3000 lbs+) and trying to accelerate. The 6.0 would be a great choice imho, the mileage tops out around 16 - just don't get the 4.10 rear, your wallet will catch on fire!
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Old July 15th, 2009, 10:36 AM   #33
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Old July 16th, 2009, 06:39 AM   #34
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Wow.. Lots of info, thanks! Now I just gotta figure out if I want that the Avalanche or the Tahoe/Yukon.
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Old July 18th, 2009, 08:10 PM   #35
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My wife drives a 04 denali with the 6.0, 3.73 gears and awd. On the highway it will get 17 pretty consistently. This past week I had a new tahoe for a about 800 miles, and it averaged 17.2. It had a 5.3 in it. In the later model trucks, I'm stuck on the 6.0. It has quite a bit more grunt than the 5.3, from my limited experience.
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Old July 21st, 2009, 08:53 AM   #36
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[QUOTE=SHARPMACHINE;1767928]Please elaborate. I would like to know which years are affected and what it take s to change it, if you don't mind. thanks


Maybee answered my own question. Thing is, I wonder if 99 was just to old to be on the list? Or, was it not a problem? Anyone know?
http://www.pistonslap.com/tsb/020601038.htm

Engine Knock or Lifter Noise (Replace O-Ring) #02-06-01-038 - (12/02/2002)
Engine Knock or Lifter Noise (Replace O-Ring)
2001-2002 Chevrolet Camaro

2001-2003 Chevrolet Corvette

2001-2002 Pontiac Firebird

2002-2003 Cadillac Escalade, Escalade EXT

2000-2003 Chevrolet Suburban, Tahoe

2001-2003 Chevrolet Silverado

2002-2003 Chevrolet Avalanche

2000-2003 GMC Yukon, Yukon XL

2001-2003 GMC Sierra

with 4.8L, 5.3L, 5.7L or 6.0L V8 Engine (VINs V, T, Z, G, S, N, U -- RPOs LR4, LM7, L59, LS1, LS6, LQ9, LQ4)

Condition
Some customers may comment on an engine tick noise. The distinguishing characteristic of this condition is that it likely will have been present since new, and is typically noticed within the first 161-322 km (100-200 mi). The noise may often be diagnosed as a collapsed lifter. Additionally, the noise may be present at cold start and appear to diminish and then return as the engine warms to operating temperature. This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi).

Cause
The O-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil.

Correction
Inspect the O-ring seal and replace as necessary. Use the applicable part number listed below. Refer to the Engine Mechanical sub-section of the appropriate Service Manual.

Parts Information
Part Number
Description
Qty

12557752
Seal-O/Pmp (O-ring)

(F and Y Cars)
1

12563963
Seal-O/Pmp (O-ring)

(C/K Trucks)
1


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Usage
Labor Time

J1060
Pickup Tube and Screen - Replace
F Car
3.7 hrs

Y Car
4.3 hrs

C Truck
1.3 hrs

K Truck
2.1 hrs
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Old July 26th, 2009, 06:53 PM   #37
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I have owned trucks with both motors, and would not buy another one with the 5.3. The 5.3 seemed very weak compared to the 5.7. Just my .02..............
Idiot.



5.3 is alot nicer motor, plus has the added benefit of being swapped out for it's larger 6.0 twin extremely easy. Not to mention that the aftermarket has huge potential for the 5.3. 5.7 is a nice motor, but I would much rather have the 5.3. (i've had both as well).
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Old July 30th, 2009, 06:41 AM   #38
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i think that you need a 02 with the 8.1 468 cubic in monster.
A 8.1 is a 496 not a 468!
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Old July 30th, 2009, 07:10 AM   #39
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5.3 > 5.7


the port design in the heads is way way better than the old school "vortech" design.
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Old July 31st, 2009, 11:17 AM   #40
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I have owned a 2000 and a 2006 Silverado both with the 5.3 I will tell u that my 06 is a dog compared to the power my old one seemed to have. The reason is the PCM choking it. GM detuned them as the years went on, and added things like Torque Management and Abuse Mode. My 06 came stock with electric fans and I added a intake and exhast I see up to 19 mpg on the hwy and i average around 15-16 in the city as long as I keep my foot out of it. But as soon as my warrenty is up I will definally be getting the PCM tuned. Personally ive done alot of research and I have decided to go with BlackBear performace. But these engines are awsome once they have the restrictions lifted. Also I wouldnt own another one without at least 3.73 gears. I have the 3.42 in my 06 and I wish all the time it was a taller gear expecally when im towing. Another good site to browse around on is fullsizechevy.com. Good luck with your purchase.
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