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Old 03-26-2014, 08:41 PM   #1
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Engine swap

I bought my TJ with plans to swap out the engine when the weather breaks. I've discussed options with several mechanic friends, and that was the best option for me. I don't have the knowledge to go tearing into and rebuilding an engine, but I can yank one out and install a new one.

First question is, there's a lot of options out there and I was looking for the best of both worlds, price and quality. I am thinking of going with a Marshal long block. I found them with two different prices $1,582.05 and $1,879.44 plus core charge on autopartswarehouse.com. I was wondering if anyone could tell me the difference in price because I couldn't tell and also if anyone recommends this engine.

My second question is, what all do you recommend changing when swapping engines? I've had someone suggest I replace the clutch set while the engine is out so to save the hassle down the road. For a couple hundred bucks...doesn't sound like a bad idea. Can anyone else offer any other suggestion?

Thanks in advance guys!

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Old 03-26-2014, 09:16 PM   #2
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Beings that yours is a 2001 i bet the clutch hasnt been replaced. Id do it myself. Obviously your gonna want new plugs. Maybe clean the throttle body and a fresh air filter. Check your radiator hoses, they are cheap to replace and maybe the T-stat. Flush the radiator also

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Old 03-26-2014, 09:48 PM   #3
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I've seen people swap 350 SBC motors all day (carbureted is easier to wire) but haven't seen long blocks without mods to the floor and firewall. I may be wrong, but things you'd have to change would be motor mounts, new trans(unless the Marshall will bolt to your stock trans, but unadvisable, it's not built to deal with so much ass) fuel pump, computers. Run hoses, new radiator, fans (electric I've seen is better, take the stock one off the engine, more hp. Plus it's lower profile=more room in engine bay) And farther down the line, look and see how well your transfer case will hold up, and if you don't have D44 axles, or at least a rear one, then axle swap or get a super 35 kit in order to handle so much power from the long block. Not to mention the weight of the thing. I've been researching an engine swap into my 99 SE, so I've caught a few things along the way.
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Old 03-26-2014, 09:58 PM   #4
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Long block just refers to it being the block, head and internal components, it doesn't actually imply a longer block. It's an exact fit engine.
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Old 03-26-2014, 10:03 PM   #5
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Originally Posted by Pat-54 View Post
I've seen people swap 350 SBC motors all day (carbureted is easier to wire) but haven't seen long blocks without mods to the floor and firewall. I may be wrong, but things you'd have to change would be motor mounts, new trans(unless the Marshall will bolt to your stock trans, but unadvisable, it's not built to deal with so much ass) fuel pump, computers. Run hoses, new radiator, fans (electric I've seen is better, take the stock one off the engine, more hp. Plus it's lower profile=more room in engine bay) And farther down the line, look and see how well your transfer case will hold up, and if you don't have D44 axles, or at least a rear one, then axle swap or get a super 35 kit in order to handle so much power from the long block. Not to mention the weight of the thing. I've been researching an engine swap into my 99 SE, so I've caught a few things along the way.

Lol. A long block is nothing more than a term used to describe how the motor comes. Long block means it comes with everything except the intake and exhaust manifolds, induction system, plugs etc
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Old 03-26-2014, 10:05 PM   #6
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Originally Posted by Pat-54 View Post
I've seen people swap 350 SBC motors all day (carbureted is easier to wire) but haven't seen long blocks without mods to the floor and firewall. I may be wrong, but things you'd have to change would be motor mounts, new trans(unless the Marshall will bolt to your stock trans, but unadvisable, it's not built to deal with so much ass) fuel pump, computers. Run hoses, new radiator, fans (electric I've seen is better, take the stock one off the engine, more hp. Plus it's lower profile=more room in engine bay) And farther down the line, look and see how well your transfer case will hold up, and if you don't have D44 axles, or at least a rear one, then axle swap or get a super 35 kit in order to handle so much power from the long block. Not to mention the weight of the thing. I've been researching an engine swap into my 99 SE, so I've caught a few things along the way.

And in most states your not gonna swap in a older carbureted sbc 350 because it has to be atleast the year of the current vehicle
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Old 03-26-2014, 10:31 PM   #7
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Was forced to swap mine before the weather broke due to a broken skirt

I personally used a spartan reman from Advance auto. 2k plus core charge. It was the most functional option for me at the time, and it's still running well(Granted, I've only put 2k miles on it). Also, the spartans have a lifetime 100k mile warranty. If i'm not mistaken, the Marshals have a 3 year 100k warranty.

Mine came with all new gaskets, so that was 50 bucks saved. Definitely replace your plugs, and your coil pack if you can afford it. I was going to replace my O2 sensors but 250 was the cheapest and that still was a bit steep for something that didn't necessarily need replaced.

Check all your pulleys, make sure they're spinning smoothly. Might as well put in a new water pump & t-stat. In general, look over other parts like your radiator, hoses, and clamps. If they're worn or you think you may need to replace them in foreseeable future, you might as well when you already have them out for the swap.

If you ever planned on upgrading to aftermarket exhaust headers or an intake manifold, now is the best time. Additionally, wiring up an electric fan will save you some fuel economy if you so choose to.

Granted i didn't have near the finances or time to upgrade and replace all the parts i wanted to. But probably the most useful install i did along side of my swap was putting in a MOPAR block warmer. If you're in a colder climate like me, 30 bucks is a cheap price to pay for a warm engine on those cold mornings.
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Old 03-26-2014, 10:46 PM   #8
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I just totally rebuilt my 4.0 due to a broken skirt I have right at 1800 wrapped up in it. It's bored .30 over biggest cam with a stock head. Had the head totally redone valves reground and seated new valve seats springs pistons oil pump the whole thing was boiled cleaned out and is all back together in a matter of about 2 months due to only having a few hours here and there to work on it and waiting on parts. I'm impressed by the way it runs and I know it was done right and all brand new parts. No there's no warranty when you rebuild it yourself but if your mechanically inclined and have great mechanic friends that do it for a living you get to learn a lot and have the feeling of I built this and it runs and runs good. No matter what route you go take your time on making the decision I would honestly not go through Autoparts wharehouse I would try and find one through a local dealer ie autozone advanced Autoparts oriellys etc.
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Old 03-27-2014, 09:33 AM   #9
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Originally Posted by Hexiled Razz View Post
Was forced to swap mine before the weather broke due to a broken skirt I personally used a spartan reman from Advance auto. 2k plus core charge. It was the most functional option for me at the time, and it's still running well(Granted, I've only put 2k miles on it). Also, the spartans have a lifetime 100k mile warranty. If i'm not mistaken, the Marshals have a 3 year 100k warranty. Mine came with all new gaskets, so that was 50 bucks saved. Definitely replace your plugs, and your coil pack if you can afford it. I was going to replace my O2 sensors but 250 was the cheapest and that still was a bit steep for something that didn't necessarily need replaced. Check all your pulleys, make sure they're spinning smoothly. Might as well put in a new water pump & t-stat. In general, look over other parts like your radiator, hoses, and clamps. If they're worn or you think you may need to replace them in foreseeable future, you might as well when you already have them out for the swap. If you ever planned on upgrading to aftermarket exhaust headers or an intake manifold, now is the best time. Additionally, wiring up an electric fan will save you some fuel economy if you so choose to. Granted i didn't have near the finances or time to upgrade and replace all the parts i wanted to. But probably the most useful install i did along side of my swap was putting in a MOPAR block warmer. If you're in a colder climate like me, 30 bucks is a cheap price to pay for a warm engine on those cold mornings.
So did your spartan just bolt up to your transmission? What did you have to do about wiring harnesses?
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Old 03-28-2014, 12:02 AM   #10
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So did your spartan just bolt up to your transmission? What did you have to do about wiring harnesses?
Yup, as long as you're getting the same engine that is in your jeep currently, the tranny(and pretty much everything else) will be a direct bolt-on. Keep in mind, you basically swapping out an identical part(as if you were just replacing a worn water pump, etc) except on a larger scale than traditionally. Wiring harness will be the same, just disconnect and move out of the way. Be sure when you're lowering in the new long block that you clear the path very well on the way down. I drove myself mad one day trying to figure out why i couldn't get one of my transmission-to-long block bolts to screw in. Turned out I had I wire pinched between them that was blocking the bolt hole. Take your time, and pictures!
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Old 03-28-2014, 12:44 AM   #11
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Yup, as long as you're getting the same engine that is in your jeep currently, the tranny(and pretty much everything else) will be a direct bolt-on. Keep in mind, you basically swapping out an identical part(as if you were just replacing a worn water pump, etc) except on a larger scale than traditionally. Wiring harness will be the same, just disconnect and move out of the way. Be sure when you're lowering in the new long block that you clear the path very well on the way down. I drove myself mad one day trying to figure out why i couldn't get one of my transmission-to-long block bolts to screw in. Turned out I had I wire pinched between them that was blocking the bolt hole. Take your time, and pictures!
I didn't know the spartan remanned engines was basically a new 4.0. Thought it was like a V-8 sorry. So, say if someone wanted to swap a 4.0 into a TJ that originally had a 2.5.... Engine and trans will have to be swapped...but other drive line stuff is fine right? How much would computer stuff will have to be done?
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Old 03-28-2014, 09:10 AM   #12
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I didn't know the spartan remanned engines was basically a new 4.0. Thought it was like a V-8 sorry. So, say if someone wanted to swap a 4.0 into a TJ that originally had a 2.5.... Engine and trans will have to be swapped...but other drive line stuff is fine right? How much would computer stuff will have to be done?
Spartan is just the company who remanufactures them, like Marshal. For a 2.5 to 4.0, there's a little more work involved. You need to weld on new motor mount brackets as they're positioned differently for the 4.0. As for the transmission, it can stay the same. However you *may* need a new flywheel(not 100% sure, hopefully someone can clarify on that).
You'd need a new wiring harness and computer as well, as it's a different engine all together and all the mathematical timing/etc will be off.
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Old 03-28-2014, 01:45 PM   #13
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Spartan is just the company who remanufactures them, like Marshal. For a 2.5 to 4.0, there's a little more work involved. You need to weld on new motor mount brackets as they're positioned differently for the 4.0. As for the transmission, it can stay the same. However you *may* need a new flywheel(not 100% sure, hopefully someone can clarify on that). You'd need a new wiring harness and computer as well, as it's a different engine all together and all the mathematical timing/etc will be off.
Would I be able to order all of that from Spartan or marshal? Or would I have to piece it together?
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Old 03-28-2014, 01:52 PM   #14
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Might as well swap in a small block at that point
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Old 03-28-2014, 03:40 PM   #15
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Would I be able to order all of that from Spartan or marshal? Or would I have to piece it together?
You probably would have to piece it together. A lot could probably be used from other jeeps without worries. There are others on here who are more knowledgeable about 2.5 to 4.0 swaps that can hopefully chime in with more accurate information. I, myself don't know too much about the parts required to swap.

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