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Old 10-14-2016, 12:11 PM
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Future YJ drive train options? need help!

well ive been debating in what direction and in what way i can refresh/ improve my 91 yj w/ the 2.5/ax5 combo.

ive been considering either a full rebuild on my 2.5 and finding an ax15 dakota 2.5 bellhouse w/ 23 spline 231j. or go full motor swap w/ a carb 4.3 chevy 5speed and an adapter for 231j or d300 tcase...

the rebuild would be the simplest option and then pickup the ax15/231j later down the road and then just mod the skid plate and drive shafts later...

im sure having a 4.3 v6 would make the tq curve more enjoyable and usable in on and off road situations. if i was to go the 4.3 route i would have to change my axle gears at all since 4.10's are a popular choice for trucks with similar drive lines.

but if i stayed w/ the 2.5 i feel that since i want to go to 33's and try to stay w/ 3'' of lift at most i would definitely need to regear to 4.88's in my d30 and 8.8 axles...

im really looking for opinions and possibly other option cause im really not sure which direction i should or really need to go...

ive got plenty of tools for fabrication and modifications and can usually make anything i need parts, bracketry, mounts and such. but it looks about the same amount of money either way. and about the same amount of effort to go either the 4.3, 5speed, tcase and drive shafts or rebuilt 2.5 w/ upgraded tranny, tcase, driveshafts and regear....

lemme know what you think. thanks in advance.

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Old 10-14-2016, 12:41 PM   #2
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I have always thought the 4.3 would be a great Jeep engine. You had mentioned an adapter to the 231J if you went with the 4.3. Why wouldn't you just want to stick with the 231C that would already be behind the 4.3? Many people upgrade the 231J with 231C parts because the 231C is a little stronger. I don't personally think there is much advantage to reviving the 2.5 if you have the skills to put in something better for the same money. As far as gearing goes, don't you already have 4.10:1 with the 2.5?

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Old 10-14-2016, 02:53 PM   #3
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Personally, I wouldn't drop any money into the 2.5L, so no rebuild.

A swap is a great idea. I would probably go either Jeep 4.0L or SBC. I'm sure that the 4.3L would be fine, but the 4.0L swap is very well-documented, and the wiring is really easy.

I'd just go SBC over the 4.3L. They are both the same amount of work, but I'd rather have the SBC.
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Old 10-14-2016, 07:58 PM   #4
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JeeperDon has a V6 swap, GM I believe. Maybe 4.6 or something along those lines, I don't remember. I haven't seen him on here in awhile but I'd look through threads he started for some build threads, or contact him.
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Old 10-14-2016, 08:24 PM   #5
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I have always hated the 4.3 i had one in a 91 blazer and it was the most unreliable POS i ever owned. Years later a friend of mine had a 1996ish blazer with a 4.3 that had the weird spider fuel injector i think is what he called it. It was like 6 fuel injectors on one unit and it was very expensive at the time. It went out on him twice and he got rid of the truck. 4.0 is a far superior engine if your going to mess with a motor swap do a 350 dont waste time on a 4.3 its not worth it.
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Old 10-15-2016, 04:51 PM   #6
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Only you can decide what's best for you.

I would expect a SBC to weigh a bit more than the original 2.5 or a 4.3 V6. You will probably want heavier front springs if you do the engine swap.

For the money, I would do a engine swap. For the practicality, I would rebuild the 2.5.
Since you plan on running 33s, the swap might be the better choice. That way you can continue using the 4:10s in your D35 until it goes out. It will probably last longer with the 6cyl. than with the 8cyl. engine.
If I were to do a swap, I would locate a complete donor vehicle. You didn't mention swapping in a Jeep 4.0. That would expand the list of donor vehicles to include Cherokee. There are many S-10s and Cherokees available for cheap. Not so many Chevy P-ups with V8s.

In the past, I have bought several "project cars" that were half done and the seller ran out of money or motivation. Naturally, I got wonderful bargains on such cars. Usually for less than what the seller had invested in parts.
My suggestion to you is to calculate ALL that is involved in an engine swap and make sure that you have the resources to see the job through to completion.

Good Luck, L.M.
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Old 11-08-2016, 11:52 AM   #7
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I just finished my 4.3 conversion. I got the engine, trans and transfer case from a guy that pulled them from a '89 S10. Bought the whole thing from him for $200. Had to rebuild the engine, that cost about $800.
New speedometer GPS $160
Holley carb $50
Carb rebuild kit $25
Carb jet kit $20
Carb to tbi adapter $50
Fuel pump $45
Engine mounts $80
Wideband O2 sensor/gauge $140
Fuse panel $65
HEI distributor $50
Shifter for the auto trans $150
And about another $500 in misc parts, plugs, wires, fluids, and so on and so forth.
All told about $2500 in it so far. Gonna have to spend some more on my exhaust system (the y pipe from the s10 won't let my front drive shaft fit)
You should have stock 4.11 gears with the 2.5, I now need to upgrade my tires from 29"'s to 31" or 33"'s.
I could have spent less on the swap but wanted to upgraded some things along the way.
So far I am loving the swap! The tq is awesome especially coming from the torqueless 2.5.
The cool thing about swapping in the 4.3/700r4/np231c is I am able to reuse my drive shafts and have tons of room in my engine compartment.
Look up my build: from squirrel power to horse power.



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Old 11-08-2016, 07:43 PM
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Quote:
Originally Posted by RawhideClab View Post
I just finished my 4.3 conversion. I got the engine, trans and transfer case from a guy that pulled them from a '89 S10. Bought the whole thing from him for $200. Had to rebuild the engine, that cost about $800.
New speedometer GPS $160
Holley carb $50
Carb rebuild kit $25
Carb jet kit $20
Carb to tbi adapter $50
Fuel pump $45
Engine mounts $80
Wideband O2 sensor/gauge $140
Fuse panel $65
HEI distributor $50
Shifter for the auto trans $150
And about another $500 in misc parts, plugs, wires, fluids, and so on and so forth.
All told about $2500 in it so far. Gonna have to spend some more on my exhaust system (the y pipe from the s10 won't let my front drive shaft fit)
You should have stock 4.11 gears with the 2.5, I now need to upgrade my tires from 29"'s to 31" or 33"'s.
I could have spent less on the swap but wanted to upgraded some things along the way.
So far I am loving the swap! The tq is awesome especially coming from the torqueless 2.5.
The cool thing about swapping in the 4.3/700r4/np231c is I am able to reuse my drive shafts and have tons of room in my engine compartment.
Look up my build: from squirrel power to horse power.



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that about what i imagined it would cost for the 4.3 swap. and at the end itd be a kickass set up! im all for a dcent upgrade from the 2.5 it truly is gutless ive had 2.3l mustangs move quicker than this jeep does bit i still love it to death!

2 days ago i came across a few abandoned zj's w/ the 5.2 v8s in them and i think i can get the pair for $150 or less... so im thinking im going to scrap the chevy swap and just go for a zj 5.2/auto swap since i will literally have every nut bolt and washer to do the full swap and then have a v8 yj thats still powered by dodge! and then just see what kind of mischief i can get my self into over the next year.
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Old 11-12-2016, 04:48 AM   #9
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I would recommend an Allison Model 250 (t-63)
250 HP and weighs between 75-125 pounds.
They are a bit dated, but quite common and they still make them new so parts are plentiful

https://www.youtube.com/watch?v=56KKRrG2LDY
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Old 11-12-2016, 08:57 AM   #10
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Quote:
Originally Posted by DREDnot View Post
I would recommend an Allison Model 250 (t-63)
250 HP and weighs between 75-125 pounds.
They are a bit dated, but quite common and they still make them new so parts are plentiful

https://www.youtube.com/watch?v=56KKRrG2LDY
Ha ha, neighbors would love you! Low end torque might be a little low, but nuthin you couldn't fix with gearing.
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Old 11-12-2016, 09:57 AM   #11
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Now that would be awesome!!! Idk if it would be a good fit functionality wise for a jeep....... but that would be one sick setup.


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Old 11-13-2016, 09:34 PM
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thatd be awesome! but idk about how itd work in a torque based type of vehicle tho. but itd be sure cool!
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Old 11-14-2016, 01:05 PM   #13
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I did the 5.2 swap in mine and am very happy with it. There is little aftermarket support for that swap, so a lot of stuff needs to be figured out yourself. Mostly the wiring is where you run into lack of support. No one makes a plug and play harness like they do for Chevy and ford swaps. You will have to modify one of the 5.2 harnesses. It can be a little daunting, but with some good schematics and patience it isn't that bad. I covered this part as best I could in my build.

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