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Old 10-22-2013, 07:51 PM   #1
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4.8l or 5.3l in my YJ?

Hey guys, I have finally decided that my jeep is getting one of these engines. The 4.8 is a little cheaper, but I'm not too concerned about that. I want one that has enough power for my 35s and 4.10s, and gets good gas mileage. Will either one get better gas mileage than the other, and how much of a difference will the extra 30hp of the 5.3 make?

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Old 10-22-2013, 08:06 PM   #2
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I really don't know anything about either of these engines but either should be good..you can feel an extra 30 horses but not a lot in normal driving

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Old 10-22-2013, 08:12 PM   #3
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I use to spend a lot of time on Chevy forums I had a 5.3. The best of my understanding is that the 4.8 would gain more power from smaller mods to a point and was faster reving. I would think both of them would work well in the jeep. As far a mpg the 4.8 might get 1 or 2 better. Look up the specs for the 99-02 half tons. The only issue I ever had with my 5.3 is it needed a water pump at 80k and an alternator. I seafoamed and changed oil every 6k and sold it at 180k and still ran like brand new. You could always do the 6.0 way better low end torque but it's very thirsty.
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Old 10-22-2013, 08:23 PM   #4
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I'd love the 6.0, but they are $1000 minimum with the wiring harness and computer. I've found 4.8s and 5.3s for 400-500.
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Old 10-22-2013, 10:23 PM   #5
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I have a 2000 silverado 2wd with a 4.8, they are tough as can be. Mine has 205,000 miles on it. the majority were highway but the last 50,000 have been wide open seeing 5,000 rpm all the time. (I was 16 when I got it so a lil lead footed). It runs like a top and wouldnt trade it for a new one. Just as twister did I had to put a water pump on it. No problems and plenty of power, will run dead even with a stock silverado ss. And get 20mpg on the highway
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Old 10-22-2013, 10:38 PM   #6
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I was really thinking the 4.8 was the one for me. I have one in an 03 Silverado with 220,000 on it. Haven't had any problems yet and it gets 20mpgs.

I think that's the way I'll go if I find another good one. I was planning to get one this Friday for $350, but it sold before I could get it. But I'm looking at a 5.3 with 140,000 on it for $500 now, might have to go that route.
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Old 10-22-2013, 10:57 PM   #7
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The real difference between the 4.8 and 5.3 isn't really ponies, it's torque. The 5.3l puts out much more torque than the 4.8l but either would be cool in a jeep
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Old 10-22-2013, 11:00 PM   #8
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Either way you go , look for low mileage .You don't know what happened to a motor that has 140,000 miles on it .
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Old 10-22-2013, 11:02 PM   #9
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Might as well do the 7.3l powerstroke.
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Old 10-22-2013, 11:10 PM   #10
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Might as well do the 7.3l powerstroke.
Okay, no need to bring Ford Diesels into the mix, must I bring out the diagram lol
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Old 10-22-2013, 11:26 PM   #11
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We just got a new work truck at my place of employment today, '09-ish Chebby with the 4.8 in it. 7000 miles on the clock. I had to make a few runs in it today, being it was my first time behind the wheel of it, naturally I had to see what it had. I was very let down to say the least. Our previous truck was a '05 Chebby with the 5.3. That truck would FLY for a bone stock rig. The 4.8 fails in comparison to the 5.3 as far as set you back in the seat power goes. The wife's DD is an 09 Ford SCREW with the 4.6 3 valve motor w/ intake, exhaust, SCT tune & it would destroy the 4.8 truck I drove today.


HOWEVER.... I caught myself numerous times saying, man I wish I had this motor in my YJ. For a Jeep, the 4.8 would more than likely be plenty.
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Old 10-22-2013, 11:40 PM   #12
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Might as well do the 7.3l powerstroke.
I would if I could. The 7.3 might be my favorite engine ever made.

And I know to look for low miles, but anything under 100,000 is $800+, without computer or wiring harness. I'm a college student on a budget, looking to replace a dying 4.0l, so I'm going to settle for a good one with 100,000-150,000 miles. They can be had for $400-500 with all the accessories, which is a bit easier on the wallet. The expensive part is the adapter plates and all those parts. They're going to break me bad..
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Old 10-23-2013, 12:19 AM   #13
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I would if I could. The 7.3 might be my favorite engine ever made.

And I know to look for low miles, but anything under 100,000 is $800+, without computer or wiring harness. I'm a college student on a budget, looking to replace a dying 4.0l, so I'm going to settle for a good one with 100,000-150,000 miles. They can be had for $400-500 with all the accessories, which is a bit easier on the wallet. The expensive part is the adapter plates and all those parts. They're going to break me bad..
If you can rebuild your 4.0 yourself, that'd be much cheaper than an engine swap. My machine work on my 4.2 was $400 and I got all the rebuild parts for $400. You can also turn your 4.0 into a stroker with 265hp and 320lb/ft torque for less than an engine swap
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Old 10-23-2013, 01:09 AM   #14
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Man on these late model motors miles wouldnt scare me much, I mean mines at 200,000 and runs like new, yours has 220,00. They'll run forever.
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Old 10-23-2013, 05:49 AM   #15
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5.3 LM7 all the way man!
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Old 10-23-2013, 06:19 AM   #16
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I would prefer the 99-02 don't care in mileage if you were going to freshen up anyway. The real advantage there is getting them tuned. I had my 5.3 tuned and it's also the same ecu from the Camaro firebird so you can have the computer control your e-fan. You could easily do the 4.8 with a small cam and gain 5.3 low end. The half tons with a cam, turbo at 7psi and 4x4 would run 13s all day stock bottom ends. Will you be staying with the Fi and PC or doing the carb intake manifold?
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Old 10-23-2013, 08:37 AM   #17
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Longevity of the late model motors is quite impressive. We recently sold the wifes former DD, a '03 Trailblazer with the 4.2 6 banger in it. It had 270k on the clock & still ran just as good at 270k as it did when we drove it off the lot.
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Old 10-23-2013, 09:24 AM   #18
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I'm going fuel injected, carbs suck in off camber situations, especially sand dunes, which I have a lot of around here.

I thought about rebuilding the 4.0 as a stroker, but its just as expensive as a swap, and I think I'd have to run premium gas, which I don't want to do.
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Old 10-23-2013, 11:00 AM   #19
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Why do carbs suck? Don't you get more hp too?
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Old 10-23-2013, 12:03 PM   #20
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In true life testing, 4.8 and 5.3 get similar mileage, 4.8 is working harder, makes up for the cubes of a 5.3. Go 5.3!!
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Old 10-23-2013, 12:10 PM   #21
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Why do carbs suck? Don't you get more hp too?
No, FI pretty much always put out more power as they are more efficient. The engine always gets the gas it needs. Carbs have a problem getting gas to the engine when you are off-camber, especially when you are speeding up a steep sand dune.
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Old 10-23-2013, 12:23 PM   #22
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Either one is a great motor. have the 5.3 in mine and LOVE it! It's a race car that I can also 4 wheel with! You can always use a programmer to get more hp or torque out of either one.
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Old 10-23-2013, 07:33 PM   #23
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No, FI pretty much always put out more power as they are more efficient. The engine always gets the gas it needs. Carbs have a problem getting gas to the engine when you are off-camber, especially when you are speeding up a steep sand dune.
This is true I've seen a couple YouTube vids where Carbed Jeeps shutdown when they accelerate up a steep incline. I'm sure there is a way to counter it though right?
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Old 10-23-2013, 07:51 PM   #24
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This is true I've seen a couple YouTube vids where Carbed Jeeps shutdown when they accelerate up a steep incline. I'm sure there is a way to counter it though right?
I haven't really seen a way besides switching to different, more off-road friendly carb. But no matter what, there will be a point where a carb will not get the fuel it needs. Whereas a FI system will always get the gas to the engine.
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Old 10-23-2013, 08:32 PM   #25
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Could you convert a carbed engine to FI?
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Old 10-23-2013, 09:15 PM   #26
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Go with a 5.3.


Yes a carb motor can be convertes to FI. , yes carbs suck offroad unless you run propane.
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Old 10-23-2013, 10:15 PM   #27
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I think I'll call on the 5.3 tomorrow. My birthdays Friday, I should get myself something nice, right? Haha
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Old 10-24-2013, 08:53 AM   #28
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I agree I would go with the 5.3 LS motor. I've seen one first hand at a shop that does custom wk around here an that ol yj with the 5.3 in it is pretty dam strong! The 8.8 that was swaped in was twisted an had to b beefed up. Lol I would say that's pretty impressive.
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Old 10-24-2013, 09:56 AM   #29
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Take a look at my write up to see what your in for. It's not hard, I did it in my garage.
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Old 10-24-2013, 10:38 AM   #30
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Take a look at my write up to see what your in for. It's not hard, I did it in my garage.
What years should I be looking for? I've found anywhere from 99-04.

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