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Unread 01-07-2012, 06:54 PM   #1
jeepsnmopars
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2012 JK Wrangler 
 
Join Date: Nov 2011
Location: Midland, MI
Posts: 111
318 Mopar Install?

I have a 1992 Sahara with the 4.0 HO motor and an automatic. It has 192K miles on it and I was thinking of a V8 swap. As you can see from my username I am into Jeeps and Mopars. I have a 05 WK with a 2" RC lift, a new Challenger R/T, 6spd super track pack and a built 68 formula S Barracuda with a 416 stoker motor. When I bought the formula S it had a decently strong 318. What would it take to put this motor in my YJ? I would put a basic rebuilt into it first but can you bolt it up to the mopar style trans and transfer case without major issues? I assume there are motor mounts available for this swap.

I see options for a small block chevy install and I actually have a 355 chevy built up and a 350 trans available as well but want it to be Jeep and Mopar. Advice is appreciated.

BTW the 4" Rough Country install is about done. Also looking at Metal Cloak, 35's and 8.8 with SYE and driveshaft.

Liking the Site! I see I am not ready to go advanced and post pics yet.

Thanks

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Unread 01-07-2012, 08:29 PM   #2
stoveguy01
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1989 YJ Wrangler 
 
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Location: Bonney Lake, washington
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yes you can Ive done this swap in my 89 wrangler and my wifes 84 cj7 both have the 5.2(318) and four speed auto from 94 jeep gran cherokees. since your already fuel injected that simplifies the wiring alot. I used and recomend the novak motor mounts
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Unread 01-07-2012, 08:38 PM   #3
444
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I've got a YJ that's I'm swapping a 98 5.2 magnum into. But I've got a stick shift and with the right combination of factory parts, it all bolts together without any pricey aftermarket adapters. To get that 318 in there with an auto, you are going to need a 4x4 904 trans from an 80's-90's dodge truck. The first year for the NP231 transfer case was 87 I think, so a 87+ 904 should work. Not sure about the mid 80's ones that would have been in front of a NP207 transfer case. I don't know if those years of transmission will bolt up to your NP231 transfer case.
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Unread 01-07-2012, 08:40 PM   #4
444
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Quote:
Originally Posted by stoveguy01 View Post
yes you can Ive done this swap in my 89 wrangler and my wifes 84 cj7 both have the 5.2(318) and four speed auto from 94 jeep gran cherokees. since your already fuel injected that simplifies the wiring alot. I used and recomend the novak motor mounts
The engine he's looking at is carbed, so to install the 4-sp, he's going to need some switches and relays to actuate the lockup torq converter and overdrive. patc sells the stuff or you can get something similar. Also, doesn't that 4-sp auto put the engine quite far forwards? I thought those 4-sp autos were significantly longer than their 3-sp counterparts?
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Unread 01-07-2012, 08:52 PM   #5
stoveguy01
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1989 YJ Wrangler 
 
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Location: Bonney Lake, washington
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ive had the 4spd auto in mine for 2 years drive it daily for a total of 32,000 miles since installed so yes the 46rh 4spd auto trans will work ive got a build thread on it somewhere
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Unread 01-08-2012, 09:38 AM   #6
jeepsnmopars
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If I use a 904 from a mid 70's car can I use the tail housing off my Jeep trans to bolt it up to the NP231?

I have this 318 just sitting on the stand with 4 barrel carb and intake so I would plan to use it carbed.
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Unread 01-08-2012, 10:04 AM   #7
LaddieHanus
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Dont know about the 904 but I have heard of guys using the tail shaft and housing from a 80-91 Grand Wagoneer that used a 727 trans on a small block mopar 727 trans
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Unread 01-09-2012, 01:41 AM   #8
wickedoffroad
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1987 YJ Wrangler 
 
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Are you set about having it be an automatic? I have a 318 in my YJ with the standard 4 speed manual transmission with a ford 203 transfer case. To use the 203 youll need to buy a longer output shaft for the transmission. stock distance for dodge is 4 1/2 inches and the for is almost 9. Trans is very easy to rebuild and tough as nails.
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