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Old January 13th, 2014, 06:55 PM   #1
dmcjeep
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Default GM 4.8 vs. 5.3 what are the pros and cons

Just kind of been looking at trucks and seems everybody that has one or the other claims theirs is the best.
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Old January 13th, 2014, 06:57 PM   #2
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Dad has a 4.8 in his. No problems yrt.
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Old January 13th, 2014, 06:59 PM   #3
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In before AJ says it's the bestest and mostest powerfulest GM motor ever.
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Old January 13th, 2014, 07:10 PM   #4
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I have the 5.3 in my 99 1/2 ton Sierra. It gets shitty gas mileage (9-10 city, 14 hwy), it tows a jeep ok at best. For the fuel mileage vs power I get, I wish I would have gone to the 6.0.
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Old January 13th, 2014, 07:15 PM   #5
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6.0 ftw.
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Old January 13th, 2014, 07:35 PM   #6
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Well, AJ says a 4.8 is better. I'd have to say whatever has the best fuel mileage to power ratio.
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Old January 13th, 2014, 07:42 PM   #7
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5.3 is a POS ( see my sig)
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Old January 13th, 2014, 07:43 PM   #8
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5.3s make a little more power and seem to be eiser to sell. If everything else was what I wanted in the truck I wouldn't care that much if it was a 5.3 or 4.8.
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Old January 13th, 2014, 07:46 PM   #9
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Used a truck with a 4.8 to tow a my 14ft enclosed trailer with some hunting gear and a yamaha grizzly in it to deer camp, the truck struggled with it the entire way, constantly downshifting. My wifes avalanche with the 5.3 towed that trailer great. I'd get the 5.3, she's getting a pretty consistent 18 mpg.
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Old January 13th, 2014, 07:47 PM   #10
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Quote:
Originally Posted by MonkeyBiz View Post
I have the 5.3 in my 99 1/2 ton Sierra. It gets shitty gas mileage (9-10 city, 14 hwy), it tows a jeep ok at best. For the fuel mileage vs power I get, I wish I would have gone to the 6.0.
This makes no sense, I have an 01 that in the summer gets 16, with an 8 mile trip to work, and 12 in the winter and that's 10-15 minutes of warming up and a 12 minute ride to work.
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Old January 13th, 2014, 07:49 PM   #11
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Might depend on what it's going in, unless it's a newer 1/2 ton Chevy.
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Old January 13th, 2014, 07:56 PM   #12
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Quote:
Originally Posted by Gogolen View Post
Used a truck with a 4.8 to tow a my 14ft enclosed trailer with some hunting gear and a yamaha grizzly in it to deer camp, the truck struggled with it the entire way, constantly downshifting. My wifes avalanche with the 5.3 towed that trailer great. I'd get the 5.3, she's getting a pretty consistent 18 mpg.
I'm sorry, but you are incorrect, my friend. AJ says that his 4.8 tows and hauls with no problems at all. So you must be lying because you aren't good enough to be 4.8 material.

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Old January 13th, 2014, 07:57 PM   #13
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I have a 2001 with a 4.8 and a 2000 with a 5.3. The 5.3 has 222,000 miles and the 4.8 has 150,000. Both extended cab short box both 4wd. The 4.8 is a major turd compared to the 5.3. It is alot more then just a noticable difference. I have towed my jeep with both and they both do good. The 4.8 with 3.73's struggles on big hills but just leave it in 3rd and its doable. My 5.3 truck can pull it in overdrive no problem. My 5000# 5th wheel camper was to much for the 4.8 and pulls nice behind the 5.3. Pretty much what im saying is if your going to tow anything more then a utility trailor go for the 5.3.
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Old January 13th, 2014, 07:59 PM   #14
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Originally Posted by booblinker View Post
This makes no sense, I have an 01 that in the summer gets 16, with an 8 mile trip to work, and 12 in the winter and that's 10-15 minutes of warming up and a 12 minute ride to work.
Yeah, I don't know. Normal driving (5 miles each way to my full time job, and 1.5 miles each way to the fire station)If I'm lucky I'll get ~300 miles out of my 25 gallon tank...Usually it's 250ish. The best I've ever gotten is strictly highway with the cruise set between 65-70 (driving to Louisville) It's well into the red when I make it there. That's just shy of 400 miles. Oh yeah, and my truck has <150k miles
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Old January 13th, 2014, 07:59 PM   #15
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My half ton with the 5.3 was getting 14 mpg average. Had plenty of power and was fine at 195k miles. Just sensor issues. I drove a 4.8 a while back while looking for trucks and it had a lot better acceleration than the 5.3 but that is as far as I got with the 4.8.
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Old January 13th, 2014, 08:02 PM   #16
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Quote:
Originally Posted by mudrunner456 View Post
I have a 2001 with a 4.8 and a 2000 with a 5.3. The 5.3 has 222,000 miles and the 4.8 has 150,000. Both extended cab short box both 4wd. The 4.8 is a major turd compared to the 5.3. It is alot more then just a noticable difference. I have towed my jeep with both and they both do good. The 4.8 with 3.73's struggles on big hills but just leave it in 3rd and its doable. My 5.3 truck can pull it in overdrive no problem. My 5000# 5th wheel camper was to much for the 4.8 and pulls nice behind the 5.3. Pretty much what im saying is if your going to tow anything more then a utility trailor go for the 5.3.
Any major difference in fuel mileage??
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Old January 13th, 2014, 08:03 PM   #17
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Quote:
Originally Posted by fordbronco View Post
I'm sorry, but you are incorrect, my friend. AJ says that his 4.8 tows and hauls with no problems at all. So you must be lying because you aren't good enough to be 4.8 material.

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I forgot, he's in the industry.
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Old January 13th, 2014, 08:25 PM   #18
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The 5.3 obviously makes more power, but the engines aren't significantly different. Same block, same accessories, just a slightly shorter stroke in the 4.8. Reliability and mileage should be very similar between the two. The 4.8 should theoretically use less fuel, but because it has to work harder to do the same job it'll lose some there. If you can handle the lower power and resale then go for it.

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I have the 5.3 in my 99 1/2 ton Sierra. It gets shitty gas mileage (9-10 city, 14 hwy), it tows a jeep ok at best. For the fuel mileage vs power I get, I wish I would have gone to the 6.0.
There's something wrong with your truck. Not being a dick, there really is. I've had quite a few friends with 99-04 1/2 tons with the 5.3 and all got at least 14-15 city and high teens highway. Hell, my 05 3/4 ton crew cab 4x4 with the 6.0 still gets 13-14 city, and it's a pig. There is no reason a 1/2 ton with the 5.3 in good working order should be getting worse mileage.
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Old January 13th, 2014, 08:29 PM   #19
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If there is, I have no idea what the problem could be. No CEL, the MPG IMPROVED to those numbers after changing plugs/wires, intake is clear of any carbon build up, it runs/idles smooth... Just gets shitty fuel mileage.
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Old January 13th, 2014, 08:31 PM   #20
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I've had buddies with O2 sensors on their way out that hurt mileage without throwing a code....could be worth a shot. I know there are a million variables to MPG so I hate to be that guy making extreme claims about it, but that's seriously awful mileage for that truck.
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