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Old 08-25-2014, 11:50 AM   #1
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Engine swap advice?

In the next few years I would like to put a Chevy LS1 engine in my jeep and I need some advice on several matters.

First what size lift would I need to run 40" tires preferably without a Bl?

Would the LS1 engine be able to handle extreme off roading? (mud, sand, rocks, etc.)

I want to keep my jeep a standard transmission but want something heavier than the ax15. what would be the best transmission and transfer case to use with this engine and tires. (preferably heavy duty 5 to 6 speed)

What do i need to do to my axels and differentials?

Any answers to the question or suggestions would be great.

I have a 98 tj sport 4.0L

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Old 08-25-2014, 03:56 PM   #2
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The fact you need to ask many of the questions you are shows you are ill prepared for this undertaking. There is far more to making a 40" tire fit and function than a lift kit and a set of axles.

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Old 08-25-2014, 04:16 PM   #3
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its not a project I plan to start tomorrow. like I said its gonna be a few years im doing some planning and research. the 40" tires is just something id like to have and will probly be done in the distant future
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Old 08-25-2014, 06:55 PM   #4
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Why do you think you need a 40" tire?
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Old 08-25-2014, 08:07 PM   #5
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Why do you think you need a 40" tire?
It's toy . . . why ask why?

It has something to do with testosterone.
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Old 08-25-2014, 09:59 PM   #6
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check out novak conversions they have a wealth of information concerning swapping an ls motor into jeeps not cheap, not easy but i would give my left ... to do it to mine. its only money
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Old 08-25-2014, 10:15 PM   #7
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If you truly want to run an LS1 and 40"s, sell your Jeep and use the money to buy this -
Artec Ultra SS Chassis


Anything you have left over you can spend on some good ECGS or Currie axles and an Atlas TC.

Honestly, for what it would cost you to build your Jeep up to run 40"s with an LS1 it would be cheaper to build a buggy. And, depending on where you live, a Jeep with a Chevy drivetrain may not be legal or streetable.
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Old 08-26-2014, 01:58 AM   #8
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Keep in mind that running something as big as a 40" tire will require tens of thousands of dollars worth of modding to make work properly... To the point where not having a body lift is the least of your concerns. There is going to be extremely little left of your Jeep that is original, besides most of the body and the frame. You'll need extremely beefy axles, at least a 6" lift, flat fenders, a different transmission, transfer case, custom steering system, aftermarket drive shafts, control arms... The list goes on. And besides, there's a lot more to Jeeping than being able to turn the biggest tires. You'll get stuck just as well as the Jeeps with 31s and 33s without the real nice goodies like lockers and the such.
Just want to make sure you're aware before you invest any big chunk of change. If there's anything i hate to see, it's an unwanted half-modded Jeep on craigslist because the owner ran out of money.

With that being said, i can answer some of your questions.

As mentioned before, novak-adapt.com is the best wealth of knowledge on Jeep engine swaps. They also sell just about all the adapters you'll need. If you do a bit of research, you'll quickly find out how expensive it'll be just to drop a LS1 in your rig.
And yes, the LS1 is up to extreme off-roading if setup correctly. There are plenty of people that even wheel professionally and keep the stock 4.0, as it has quite a bit of power when rebuilt with a stroker kit or supercharged.

As for the transmission, my knowledge is limited there. I know in a lot of heavier rigs, a GM transmission is a common choice. A lot of engine-swap writeups say to keep the transmission that came with your engine. So the one that is going to be mated with your LS1 could be a potential candidate.

And finally for the lift, i'm not too knowledgeable in that area either. But a ballpark estimate is around 6" if you're willing to modify the body with cutting/hiliner fenders/etc. Or possibly around 8" without.


I know it seems like we're trying to put you down, but we're just trying to get you to understand the gravity of getting into a project like this. I'm aware you said in a few years, however with your eyes set on a project so big, you won't learn much without hands-on experience with the small stuff. Start small, mod things here and there and the knowledge will come naturally. Trust me, i got my jeep a little over a year ago and have already leaned an immense wealth of knowledge just by fixing what breaks, and running into problems doing so.
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Old 08-26-2014, 09:12 AM   #9
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Mud, sand, rocks, etc with 40's? You wanna build the Swiss Army Knife of Jeeps. I look forward to your build thread
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Old 08-26-2014, 01:35 PM   #10
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You may want to look into a 5.3 swap as opposed to an LS1. Much cheaper and a stout engine. Guys that blow their LS's swap in 5.3's

Parts are cheap and the power is plentiful
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Old 08-26-2014, 01:43 PM   #11
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For your project, spend some time reading the "hardcore tech" section on the pirate4x4 website. You will get lots of ideas there to get your thought process and research going.
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Old 08-26-2014, 11:20 PM   #12
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Thanks for all the help guys. Iwhat I do manage to get done on it will be done slowly little here little there like anyone else. The 40" tire idea is and idea and if I do manage to make it happen in the future it will be because why not. And the engine is because I love corvettes but there so hard to get in and out of ill just take the engine
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Old 08-27-2014, 12:39 AM   #13
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I'm with O M Jeep...the amount of money you're going to spend on this...wow. Just build a buggy.

tens of thousands of dollars are going to be needed to make this run...regardless of how much in the future this is.

All said and done i bet you'll easily have 25+ into it just in parts
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Old 08-27-2014, 08:01 AM   #14
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Thanks for all the help guys. Iwhat I do manage to get done on it will be done slowly little here little there like anyone else. The 40" tire idea is and idea and if I do manage to make it happen in the future it will be because why not. And the engine is because I love corvettes but there so hard to get in and out of ill just take the engine
Just because is not the right mentality when modding- you'll do things 100 times over.

Sit down, write out what you want to do with the jeep. Write out a performance oriented end goal (I want to be able to tackle these trails, go this fast, etc etc.) then draft up a plan on how to make your jeep achieve that goal and work towards it little by little.

I've seen thousands of guys butch builds in the F-body world and others just trying to do things "because" and then they realize that their ride doesn't perform half as well as someone who thought it out and has a fraction of the money in it. Then they get all pissed off.

Take your time and do it right. If it was me, look into your motor swap and forget the big tires right now. Once you got that where you want it, hit your trails and see what you can and cant do, then fit the suspension and tire size to your needs...not because
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Old 08-27-2014, 02:57 PM   #15
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im running a 4" lift already. I need to play with the axels for bigger tires with my current setup. I want the engine and the novak site that was posted was a lot of help still gonna be a while before I can start affording parts. the 40" tires was just a thought that popped into my head I have no clue why
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Old 08-27-2014, 04:58 PM   #16
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What do you have for a lift and axles now?
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Old 08-27-2014, 08:33 PM   #17
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a teraflex suspension lift and stock axles. im definatly doin 35's when my tires wear out. what do I need to reinforce on the axles and what gear ratio should I change to.
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Old 08-27-2014, 10:23 PM   #18
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Are you also running a tcase drop or did you go with a cv shaft and slip yoke...

Regardless, here:

I want to run 35's on my TJ - JeepForum.com
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Old 08-28-2014, 10:38 AM   #19
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neither. im ordering the cv shavt and the sye after I get out of boot camp

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