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Old 06-08-2010, 01:08 PM   #1
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V8 Engine swap questions

I am swapping out my 2.5L for a 350 chevy. I am getting an AX-15 manual transmission with the adapter to V8 engine. Has anyone done this conversion/swap and if so, could you tell me some troubles and issues I will run into? Did you have any placement issues or driveshaft alterations from the stock?

I've researched this a lot and everything tells me that there's no problems with the AX-15 with the V8 adapter.

Also, with a carb. V8, can I put a/c on it? Does it bolt on to a carburated small block? Thanks.

PICS are very helpful.

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Old 06-08-2010, 03:28 PM   #2
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Wow, I was just going to post the same question. I been thinking about it and a 350 swap would be awesome and cheap.

My straight six has great compression but leaks like a mother and just does not have the power I need.

I don't care about AC but what do I need to get to get it to mate to the transmission? My 5 speed is in real good shape and so is the transfer case. It seems fairly straight forward.

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Old 06-08-2010, 03:48 PM   #3
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Novak is a good place to start.

i'm by no means a expert on this..lol i'm starting this swap myself. right now i'm gathering parts. idk about it being a "cheap" swap. there is alot i'm finding out i need to change. engine, trans, transfer case, axles, etc etc etc.

with the 2.5L alot more will need to be changed as for the 4L probably less bc axles etc may work. but that link i posted has alot of useful info in it
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Old 06-08-2010, 04:54 PM   #4
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The axles won't need to be changed, just regeared to 4.88s for larger tires, I do know that. As for the transfer case, the NP231 will mate to the AX-15 I am getting perfectly, so no problems there. The only thing I've gathered is I will need the adapter for the tranny to engine, regearing to 4.88s, and possibly getting a new rear driveshaft if I have problems with length and engine placement.

After speaking with multiple mechanics, the AX-15 transmission will bolt up to a chevy V8 with no problems by using the correct adapter, which novak does carry. I will also need to cut out the stock engine mounts and bolt/weld on the new GM mounts designed for the YJ carriage. I'm no electrician or mechanic, so that's why I'm going with a Carb. Chevy 350 to make the conversion easier.

Also, everyone is telling me not to do a swap unless you have at least a 3" suspension lift b/c of the clearance issues with the stock YJ suspension. I have a 3.5" Rough Country Suspension lift, so i'm good to go for that.

My main question now is, does anyone have a pics of this swap or similar? I also want a/c b/c i live in arizona, so a/c is a must!
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Old 06-08-2010, 05:55 PM   #5
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I'm looking to do the same thing soon here. I'm going EFI though. Seems better for trails and off camber sections. Novak is a badass site and definitely has alot of good info and adapters. Keep us posted on how your swap goes and when I get into mine I'll do the same.
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Old 06-08-2010, 07:22 PM   #6
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I am in AZ too, come on hundred degree temps are what's it's all about I really wish I could see direct process then I know I can do it quicker. I am also sitting on a 3" lift. My gears are way low now, I have 3. Somethings in it from what I counted.

It seems like a fairly simple swap except for the mating to the transmission goes and kind of mounting the engine itself. I am kind of surprised I can't find a complete step by step. But, I will have to see. It sounded like a cheap swap since I can get a turn key stocker 350 for around 1500 Bucks.
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Old 06-08-2010, 07:29 PM   #7
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Yeah, an old family friend of ours... a guy whos basically my uncle owns a Chevy dealership so I'm going to see what kind of deal I can get from him if one at all. Maybe see if he knows of any trucks or cars totalled from the rear end and get the engine out of that. Not sure what route I'm going to take yet.
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Old 06-08-2010, 07:54 PM   #8
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and a 350 swap would be awesome and cheap.




What?
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Old 06-08-2010, 08:41 PM   #9
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Yeah, def not cheap. I figured 3 to 4 grand at the low end.
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Old 06-08-2010, 08:43 PM   #10
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Don't forget you will need new motor mounts ,maybe you all know just didnt see mention of it.Also need to consider what you are doing for your exhaust ,headers ? stock manifolds .Also if you are going EFI you will need a matched computer ,carbed you just need a solid state ignition MSD,and Jaob's makes nice stuff.The stock rear will not hold up long with V8 power,I would go with at least a dana 44 or better.Remember when its done we want pics!!!!!
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Old 06-08-2010, 09:32 PM   #11
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yeah, I found a 5.3 Vortec out of a 2005 Silverado with 55k miles for 800... and that includes comp then I have a guy that will come install it...( after I buy all of the other parts needed) run it and smog it for 400 bucks flat so thats 1200 plus 700 for parts, thats 1900. You can definitely go about it without spending a million bucks if you find the right deals. This is all assuming that you have the right axles, tranny, xfer case and adapters.
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Old 06-08-2010, 10:04 PM   #12
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Still not bad but def not as simple as I thought. I am still consdering it. But, I will get my Heep to run good with the straight six. I figure about 5k for a complete solid drive train. Which is double of what I first expected. Then another 5k for suspension and axle work. There is no way the open diffs will hold up to a v8.


It just depends on what route I want to go. Keep it as POS romper or get to a nice ride that can 4 wheel like no other.


Very good info though.
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Old 06-08-2010, 10:14 PM   #13
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I agree the EFI is better. I like technology. But in defense of carbs: well tuned carbs work great. They used to use them in airplanes, and those go off camber and uphill really steep. At high altitudes. Just saying.
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Old 06-08-2010, 10:24 PM   #14
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I thought you couldn't use a combustion engine in an airplane due to lack of O2 at that altitude..... no O2 no combustion. I'm no airplane expert... or engine expert for that matter so just asking. But I guess if it was an old airplane they didn't go very high anyways so it would work. Like a rotary engine.

and yes... a well tuned carb on a nice 350 is an awesome thing.
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Old 06-09-2010, 12:57 PM   #15
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Carbs are cool in their special nestolgic way. But, ever since I started working on injected motors it just seems more simple to me. More wires but much better fuel distribution along with DIS. Distributers are always a pain if you over think them.
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Old 06-10-2010, 12:23 PM   #16
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My father bought a 90 YJ with 350 a few years ago, its rough and been sitting, Im getting ready to restore it. I believe it has A/C attached to it. Ill check it out, and try to load some pix for you to look at.
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Old 06-10-2010, 05:59 PM   #17
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Originally Posted by PJBASEBALL99 View Post
I am swapping out my 2.5L for a 350 chevy. I am getting an AX-15 manual transmission with the adapter to V8 engine. Has anyone done this conversion/swap and if so, could you tell me some troubles and issues I will run into? Did you have any placement issues or driveshaft alterations from the stock?

I've researched this a lot and everything tells me that there's no problems with the AX-15 with the V8 adapter.

Also, with a carb. V8, can I put a/c on it? Does it bolt on to a carburated small block? Thanks.

PICS are very helpful.
I'm currently running this setup.... Any questions just PM me
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Old 06-10-2010, 07:04 PM   #18
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I'm currently running this setup.... Any questions just PM me
Uplifted, How do you like it? would you be so kind as to include a ballpark dollar amount on what it cost in total? sounds like a pretty solid setup. I'm pretty excited to get started on it.... and even more excited that 2 other guys on here are doing it around the same time sp we can collaborate.
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Old 06-10-2010, 08:07 PM   #19
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Uplifted, How do you like it? would you be so kind as to include a ballpark dollar amount on what it cost in total? sounds like a pretty solid setup. I'm pretty excited to get started on it.... and even more excited that 2 other guys on here are doing it around the same time sp we can collaborate.
I love it.. More than enough power..It's very hard for me to put a dollar amount to it though as i was not trying to stay on a budget when doing it. Hell i have close to a grand in the cooling system alone..My only advise is to take your time, don't rush it and you'll love the outcome as well. Trust me. . Shoot me a pm if you want to get into details... I do have some pics when i built it as well that might help..
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Old 06-10-2010, 09:40 PM   #20
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Quote:
Originally Posted by PJBASEBALL99 View Post
I am swapping out my 2.5L for a 350 chevy. I am getting an AX-15 manual transmission with the adapter to V8 engine. Has anyone done this conversion/swap and if so, could you tell me some troubles and issues I will run into? Did you have any placement issues or driveshaft alterations from the stock?

I've researched this a lot and everything tells me that there's no problems with the AX-15 with the V8 adapter.

Also, with a carb. V8, can I put a/c on it? Does it bolt on to a carburated small block? Thanks.

PICS are very helpful.
Here is a short list of some items you will need. This is not all inclusive as each swap is different.

- Conversion Radiator (4WD.com, Advance Adapters, or Novak)
- Fuel Pressure Regulator and/or a Fuel Pump (Summit)
- Conversion Engine Mounts (Advance Adapters, Novak)
- Bellhousing/transmission Adapter (Novak or Advance Adapters)
- Power steering line adapter fittings (Fastenal)
- New gauges or try to get your existing ones to work on the 350
- 1 wire alternator *not required but greatly simplifies things*
- Custom exhaust

My swap cost about $3000. You might want to compare some prices between Novak and Advance Adapters. I think Advance Adapters is a little lower on some of their prices.

You don't need to lift your jeep to do a 350 swap. I ran my Jeep with a 350 in it for several years with nothing more than a 1" shackle lift. You will want to be careful which filters you use though. There are short ones and long ones. Don't use the long ones. The front drive shaft will rub a hole in it while off-roading and you'll lose all your oil pressure. Ask me how I know.

The stock Dana 35 rear end isn't going to last very long behind the 350 with larger tires. As for the drive shafts, I placed the engine in the Jeep so I wouldn't have to change the lengths of them.

If the 350 you are using has the low mounted power steering pump you will need to get a high mounted power steering pump bracket from a wrecking yard. The power steering pump will be too close to the differential if you don't

You should be able to put an A/C system on regardless of what fuel delivery system you are running. You will just have to find a 350 with A/C in a wrecking yard and remove the brackets and compressor.

Here are a few pics from my swap. These pictures show the power steering pump with it mounted low. I had to go find the other bracket that mounts up by the exhaust manifold.






In this picture I am leveling the frame so that I can get the engine mounts level with the jeep. That is why one tire is off. You don't have to take the whole front end off but it makes it so much easier to work around.






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Old 06-10-2010, 10:36 PM   #21
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Wow, thats a really nice looking engine there.... I can't wait, but as uplifted said, I'm going to take my time. I leave for the Gulf tomorrow to hop on a responder vessel for a few months so I'll definitely have a nice stack of pennies saved up to get started when I get back. I hope everyones builds go well and thanks to those who threw their advice out. I hope to see a bit of progress from Samson and PJ when I get back, that would be awesome. Build and ride hard. - Nate
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Old 06-10-2010, 10:40 PM   #22
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Yes, taking your time is a very good idea. I took 3 months to complete my 350 swap.
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Old 06-10-2010, 10:41 PM   #23
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WOW that looks good That is why I wanted the 350 But said I would do the V6! What trany and transfer case are you using?
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Old 06-10-2010, 10:51 PM   #24
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I was using an SM465 mated to a np231J converted to HD using np231C-HD internals from a ZR2. The chain and gears are wider and the planetary gear set uses 6 planetary gears instead of 3. You just have to use the Jeep case to retain spline counts and bolt patterns.
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Old 06-11-2010, 07:27 AM   #25
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Sweet install Coyote...That should give him an good idea of what he has ahead of him... As far as taking your time PJ, it all depends on your skill and wallet... I'm a nut when it comes to fabrication and blasted through my conversion in 3 days :... I hate to wait..... I used Novak for my trans adapter, engine mounts and slave cylinder...I used Becool for my radiator..I'm running a dual exhaust all the way to the rear bumber with stainless magnaflows..As Coyote mentioned, a one wire dist as well as a one wire alternator will simplify your install when running a carb.. I plan on going with an aftermarket fuel injection setup in the next few months just to see if i can sqeeze a few more MPG out of this.. Good luck with your install..
Here's mine

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Old 06-11-2010, 03:05 PM   #26
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Damn, it sure makes the YJ way different. A v8 would just be totally awesome, great power and not that much heavier if heavier at all.
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Old 06-12-2010, 06:12 AM   #27
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Save your time and mony and buy a stroked 4.0 unbolt yours and bolt in a new one.
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Old 06-12-2010, 10:45 AM   #28
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Save your time and mony and buy a stroked 4.0 unbolt yours and bolt in a new one.


I have never seen a stroked straight 6. They do have good power numbers though.
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Old 06-12-2010, 11:26 AM   #29
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Yes. If you bore and stroke the 4.0L you can get around 300hp.
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Old 06-12-2010, 11:32 AM   #30
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very nice Coyote_94yj. looks great

and thanks, i'm starting to gather parts for my 350 swap in my YJ and you listed some things i didn't think of.

been trying to get a list goin so i have a idea of what i need to buy. i always like doin this before jumping into something big like this

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