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Old 12-18-2013, 01:59 AM   #1
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5.7 Hemi swap VS. LS swap

simple questions really...
1. Which is better and or more affordable?
2. what is the primary use or optimal use for either engine?
3. do i need anything stronger than 44 axles front and rear?
4. whats the average price range in doing such a swap, either one?

got a 1997 TJ sport, lots of work done to it already though. time to up the power output.

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Old 12-18-2013, 09:26 PM   #2
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Lots of variables here. What year, which LS engine? How much work are you paying for vs. doing yourself? You can easily spend $15k on a top notch professional swap with either a new LS or Hemi. Then you get into comparable transmission, transfer case, axles etc.

I own a 2011 5.7 hemi in a Ram 1500, used to own a 6.0 LS GTO. While the 1500 obviously isn't faster than the GTO, it's very quick for a truck, and I often wonder what the Ram would be like (relative to the GTO) if it weighed 1,000 pounds less. Can't speak to the durability of either, both less than 40,000 miles.

Sold the GTO for 2000 TJ w/ a built LS7 on Currie D44 axles. No issues w/ 31" tires. To soon to tell w/ 32's on it now but I'm not expecting any issues.

Biggest issue w/ any swap is probably getting all the little electrical gremlins out.

You might also go have a conversation with you local state inspection place and see what steps you need to follow to keep it passing inspection in your state, because you'll end up removing every piece of emissions equipment in swap. It's about how you put it back. Even when new emissions stuff is put back, some places will likely flip out if it doesn't look OEM.

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Old 12-18-2013, 11:12 PM   #3
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Read my build thread listed below. If you have any further questions (I expect that you will if you are serious about the conversion) them send me a PM.
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Link to build thread..http://www.jeepforum.com/forum/f22/s...rsion-1277803/
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Old 12-18-2013, 11:30 PM   #4
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I have referenced your build a lot sduncan. Much appreciated!

-Michael
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Old 12-20-2013, 01:01 AM   #5
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sduncan thank you so much. you'll hear from me soon.
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Old 12-20-2013, 07:08 AM   #6
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You'll find that the LS swap will be cheaper, assuming you go with the LSX motor. The parts are a dime a dozen for this motor as chevy put it in EVERYTHING. You can pull a running LSX out of junk yards here with 100k on them for $300.00. Obviously theres much more into it, but I think for the money and parts, you cant beat it.
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Old 12-20-2013, 08:46 AM   #7
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Well I would prefer to buy a new one if not one with very few miles on it if I can help it. The new ones are obviously stronger, more efficient, and will last longer. but I would assume that since they're so prevalent it would be much cheaper and easier to complete with the abundance of parts.
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Old 12-20-2013, 09:29 AM   #8
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Quote:
Originally Posted by destruo View Post
Well I would prefer to buy a new one if not one with very few miles on it if I can help it. The new ones are obviously stronger, more efficient, and will last longer. but I would assume that since they're so prevalent it would be much cheaper and easier to complete with the abundance of parts.
Ahh brand new, yeah it'll be a little more expensive, nothing too bad. The junk yard motors are just super popular here because of how much life you can get out of it for $300.00
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Old 12-20-2013, 09:39 AM   #9
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Honestly I'll have to do some more research and see what the ls motor is like compared to the hemi. And see what trany is good and combo and so on. I'll Also take a look at our junk yard after I see what motor would fit in my rig.
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Old 12-20-2013, 10:08 AM   #10
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I would like to do a Hemi into my YJ someday. A friend of mine is putting a Hemi into his '69 Cutlass.

The costs with either are going to vary depending on where you find your engine. Supply and demand. One yard might want 3k for a complete engine, you might find a comparable one elsewhere for 1k.

As for durability, the LS seems to have a pretty good rep. What I've experienced with hemi's with up to 30k miles, I wouldn't hesitate to get one for a good price. I think where you will really run into problems is aftermarket support. LS support has a long list of major companies offering cams, cals, ecms, etc. Hemi aftermarket support just isn't there. As long as you are planning to pretty much run stock hardware on the hemi, you can still do pretty well. If you are fine with just 370HP.
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Old 12-20-2013, 10:19 AM   #11
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I think I'm leaning more heavily toward the LS motor because of build Support, aftermarket Support, customizability and largely because of the price. Thanks peeps!
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Old 12-20-2013, 11:35 AM   #12
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What about a diesel?
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Old 12-20-2013, 11:40 AM   #13
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Diesel's don't interests me. I think That's just me personally. Sorry to shoot you down!
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Old 12-20-2013, 12:05 PM   #14
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I only mention it because a lot of people only think there is option A or B but don't know about C.
The 4BT just brings another option to the table with different characteristics.
All are good choices
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Old 12-20-2013, 12:10 PM   #15
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It's a good mention! Although in this case, I had thought of it and because of gas prices and the fact that I just don't really like diesel I kept it out of the equation.
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Old 12-20-2013, 01:05 PM   #16
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Theres a turbo diesel swap (sorry dont forget what motor) out of the older mercedes that is pretty cheap and easy to do. I read a thread on it, and I think the guy got the motor and entire turbo set up for $700 shipped to his house. 25+mpg out of the thing, and a ton of torque.

LS will be the way to go tho as far as price and support goes. Good luck!
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Old 12-20-2013, 01:13 PM   #17
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Thank you!! I think the difference between the better mileage I get with the stronger ls motor over my stock one and the Turbo diesel gas prices will all even out. I just think the ls swap is more prevalent, hence a bit easier to learn how to do as I go and get parts.
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Old 12-21-2013, 07:39 AM   #18
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It also weights much, much less than a 4bt. I'm not a big diesel fan either. Well at least not in a tj.The ls swap will serve you well an I'm sure you would be more than happy with it.

Another option to think about is the magnum v8. It isn't as fuel efficient as the ls motor but it's by far the cheapest and easiest swap.

Also the Dana 44 rear, or explorer 8.8 rear will be more than adequate. You don't need a 44 front. The Dana 30 works just fine up to 35" tires.
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Old 12-21-2013, 07:54 PM   #19
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Thank you!! I think the difference between the better mileage I get with the stronger ls motor over my stock one and the Turbo diesel gas prices will all even out. I just think the ls swap is more prevalent, hence a bit easier to learn how to do as I go and get parts.

Check your regular email....

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Link to build thread..http://www.jeepforum.com/forum/f22/s...rsion-1277803/
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