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Unread 01-21-2013, 09:00 AM   #1
mburgess00
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1979 CJ5 
 
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Cj CJ engine/trans swap options

Hey all... I've been considering a swap of my engine/trans in my 79 CJ5. The 258 is a little tired and I'd love to get some FI in there. I have the T150 transmission and the crawl ratio is just dreadful, so I'm thinking a 4-speed at the same time would be a good idea.

So what to you guys think would be the best combination considering cost, relative ease of installation, and length of driveline?

Right now, I'm thinking a Chevy 350, T18 (maybe?), and retain my Dana 20.

Here's a pic of the Jeep for reference



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Unread 01-21-2013, 11:49 AM   #2
1986cj
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I had a 79 CJ5 renegade 258/T18/20 with 4:10 axles. Great combo, great trans. SBC would be great just check with emissions as what you can do and can not do, now that they control that area also. They have a lot of rules now but is very doable. It is going to have to be newer that the Jeep, every thing on the engine, smog pump, egr, tac system ect. will have to be on it. Call them and run any plains by them. There easy to work with and you don't end up spending/wasting money that they won't let fly.
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Unread 01-23-2013, 04:27 PM   #3
arg0413
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I'm just finishing swapping in a T18/D20 into my Q-track CJ with a 4.2L, id deff go the small block route with a T18! Easy swap, you only need one cheap adapter for the SBC, and you'll have more crawl ratio than you need with that 6.32-1 granny low!
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Unread 01-24-2013, 05:22 AM   #4
nshefbuch
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Another option that's cheap is amc v8. Would bolt up to a t18 no adapters needed but from experience my 360 is only around 8mpg and just north of 300 on both Hp and torque. A simple rebuild and two barrel will get you around 275hp.

What to weigh would be the savings of a adapter and out that into the motor for say a four barrel and intake swap or the 350 which everyone knows is cheap and parts galore.

Now after having mine and If I were to do a rebuild again or motor swap, I'd be looking into a LS swap. The LS will boot up to t18 with no adapters and you will have EFI on that motor. EFI is what I wish I had on mine as even my truck avenger carb doesn't like a couple of the hills I'm climbing.

My only complaint on the t18 or one similar is no OD. PS- my tcase is d300 which IMO is the best tcase jeep made.
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Unread 01-25-2013, 06:56 PM   #5
BriansCJ
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I'm doing a 5.3 or 6.0 vortec, SM465, Dana 300 4:1
Crawl ratio should be about 120:1 with 300 # of torque
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Unread 01-25-2013, 07:03 PM   #6
mburgess00
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Great comments guys. Mostly confirming what I'd read otherwise.

What do you think about OBD I vs OBD II for swaps? There's obviously emissions implications. I'm not too worried about wiring it up, as I'm pretty good with that stuff.

Matt
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Unread 01-25-2013, 09:38 PM   #7
BriansCJ
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Obd2 all the way.
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Unread 01-25-2013, 09:43 PM   #8
mburgess00
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Quote:
Originally Posted by BriansCJ View Post
Obd2 all the way.
What does ODB II get me? The reason I am shying away from it is I am somewhat worried about the emissions aspect as they plug in while they do the test around here.
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Unread 01-26-2013, 07:30 AM   #9
nshefbuch
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Quote:
Originally Posted by mburgess00

What does ODB II get me? The reason I am shying away from it is I am somewhat worried about the emissions aspect as they plug in while they do the test around here.
I wasn't even thinking about emissions. I must admit that it's over my head as we don't have emissions testing in Ohio. Do you have to worry about visual inspections or type like Cal and the motor has to be same make for engine swaps? You will definitely need EFI then for emissions test.

Don't get hung up on having a final crawl ratio of over 100:1 as that's really not going to help you much unless all you do is rock gardens. If you can get around 75:1 that's plenty low enough and still high enough for mud running.
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Unread 02-04-2013, 11:04 PM   #10
ZombieCrush1
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Cj Swap

I put a TBI 350 backed by a T-18/Dana300 4.56 gears, is strong and I mud drag my rig. It was an easy swap.
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Unread 02-06-2013, 08:22 AM   #11
mburgess00
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Quote:
Originally Posted by nshefbuch View Post
I wasn't even thinking about emissions. I must admit that it's over my head as we don't have emissions testing in Ohio. Do you have to worry about visual inspections or type like Cal and the motor has to be same make for engine swaps? You will definitely need EFI then for emissions test.

Don't get hung up on having a final crawl ratio of over 100:1 as that's really not going to help you much unless all you do is rock gardens. If you can get around 75:1 that's plenty low enough and still high enough for mud running.
Unfortunately, yes we have visual inspections. The word I got from the DMV/Emissions is that you have to have the equipment for the year of the vehicle or the engine, whichever is newer - and the test will be for the same. Since I want fuel injection it would be the year of the engine in this case.

I totally hear you on crawl ratio. I'm not overly concerned about the final ratio - it just needs to be a bit better than what I have with the T150.
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Unread 02-14-2013, 03:39 PM   #12
Luckyirish2440
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Look into a Vortec V6. Really strong motor and it can be placed so do you don't have to worry about the drivelines being modified. Decent gas mileage also. Considering what you're doing it's not that hard. NOVAK adapters has a lot of good info on the swap. Expect the jeep to be down for a month or so.
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Unread 02-15-2013, 10:58 PM   #13
Repete
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I suggest either a Chev 4.3 V6, or a V8. Go with the Muncie 465 which bolts right up to the engine, and then use an adapter to go to a Dana 300. The 465 has a 6.54 first gear, and the Dana 300 has a low range of 2.62 versus the 2:1 that that Dana 20 has. It looks like you have 33's on your rig, so you could go as low as a 3.54 axle ratio for highway spin at 60 mph of about 2300 rpm, and still have a crawl ratio of 61:1. Eventually you could get a 4:1 in the Dana 300 and get a 92:1 crawl ratio, while still retaining a good highway rpm.

I have this setup in my 52 flatfender with the V6, and the driveline length works. Good luck to ya!
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Unread 03-08-2013, 08:58 AM   #14
mburgess00
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So, I made my decision! I got a 350 with TBI from the junkyard this past weekend. I will be getting an SM465 very shortly which will be adapted to my dana20. In the future, I'll probably add the teralow kit which is good for 3.6:1 (IIRC).


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Unread 03-08-2013, 09:15 AM   #15
mburgess00
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I created a build thread here:
http://www.jeepforum.com/forum/f22/m...-build-1490060
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