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Unread 06-27-2013, 04:43 AM   #1
Duncan71
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1992 YJ Wrangler 
 
Join Date: Jun 2008
Location: Canada
Posts: 78
82 Cherokee Chief 360, 4.2l or 4.0L swap?

Hey all,

Just finished the body and suspension on my 82 Chief - I need a new motor now. The current 360 is bunk, its got a bad lifter/valve noise and is a pig and pain to tune. I would really like a bulletproof 4.0l or 4.2l to make this thing reliable (power is less of a concern over mileage and economy). What swap is easiest - use a 258 and matching trans mated up to current tcase of pull the trans/motor/tcase from an XJ and put it in? Can anyone lend my some insight? Thanks a ton.

Duncan

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Unread 06-27-2013, 09:55 AM   #2
muddy93
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1987 FSJ Wagoneer 
 
Join Date: Aug 2007
Location: Templeton, Indiana
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If it were me, I'd rebuild the 360. However, if you are set on putting in a 6, I'd go with a fuel injected 4.0 The 4.0 shares the same bellhousing bolt patern as your 360, so it will bolt to your current transmission(might need a different flex plate though). Then it would just be a matter of new motor mounts and some wiring.

And, here's some interesting info, the 4.0 makes 180-190 HP. The 360 used from 78-91, only made 160 HP.
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Unread 06-27-2013, 10:13 AM   #3
super98lsc
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1999 WJ 
 
Join Date: May 2006
Location: Austin, TX
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I have a 4.8 stroker fully forged,ported,balanced,solid lifter cam etc setup for the single turbo/intercooler on my WJ. Also own my GWagon with 360. The 360 economy stinks 13-14mpg at best. The 4.8 in the lifted WJ gets 23-24 hwy, 16 city in traffic with AC loaded up etc. I plan to redo the top end/cam/heads on my 360 and eventually add computer controlled timing and injection. Accompanied with an overdrive it should get 18 hwy and likely 13 city. I think 20mpg will be pushing it with a gas engine as the truck has the aerodynamics of a cinder block. If you can score an injected 4.0 thats in good shape go that route. The injection is easily tune-able for anything you want to do. ( I have someone who is amazing with the Chrysler PCM) In that big jeep though your going to wish it was a stroker quickly as the 4.0 in stock form in my WJ 4x4 got about 14mpg since new and maybe 16 hwy. Once I added the larger stroke/bore the boost in tq and tuning not only added a TON of power but increased the mileage immensely. Part of the gain was it was a CA emission truck and tuned terribly from the factory plus had 3 cats on it. Personally if you have a 360 that is rebuild able I would lean that route or snag an LS 4.8/5.3 driveline out of a GM rig and bolt it all in with the OD trans/PCM/T-Case. You will get near 20mpg and great power with either motor and the salvage yards near Austin I have spoken with will sell me the entire setup complete for <2k with under 30k miles on it. Hard to argue with 300+ hp/Overdrive/Injection for that price.
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Unread 06-27-2013, 11:09 AM   #4
pleontks
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1976 J-Series Truck 
 
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My j10 360 gets 15mpg hwy when it feels good. My 87 xj 4.0 2wd 210k gets 25mpg hwy.

My buddy just got a 94xj 4.0ho, with 301k, and horrible valve clatter, but has incredibly more power than my xj, which runs better. If you go with the 4.0, definetly get the ho version.
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Unread 06-27-2013, 05:57 PM   #5
Duncan71
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1992 YJ Wrangler 
 
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Definitely the route im thinking is the 92-94 HO 4.0l. My only concern is will it bolt right up and what else needs to be changed?
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Unread 06-27-2013, 07:42 PM   #6
jeeper54
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The only easy bolt in I know of is another 360. Going w/4.0, have you considered using the AW4 since it has overdrive? Gearing, tire size & lift are all factors too. My 81 cherokee w/t track w/258, auto, 3:31 gearing and running 31 inch tires got me 15 mpg, my XJs w/4.0, auto, 3:55 gears and 30 inch tires got 16 mpg w/3 inch lift & 17 mpg w/2 inch lift. My waggies w/360, auto, various gearing got 10-13, That's 65-70 mph. That's just my experiences but a consideration.
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Unread 06-27-2013, 07:52 PM   #7
Duncan71
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1992 YJ Wrangler 
 
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Its got the manual trans rights now, so I definitely dont want to convert to auto. Im just wondering if the t176 with long tailshaft and spacer will mate up to the 4.0L. This amc 360 is bagged, and a bulletproof 4.0l is defs a better plan.
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Unread 06-28-2013, 07:32 AM   #8
Zorm
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1983 FSJ Cherokee 
 
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I 2nd super98lsc. I have a 4 door 83 cherokee that had a 258, T176 and NP208. I added HEI dizzy, 4.0 head and 2100 2bbl carb. Once I changed the axles to WT and 3.?? from the 2.76 I had, I thought it was real good.
Now I kept the crank and piston rods from the 258 and built a 4.6 stoker. I am keeping my T176 for now and just need a bushing from Novac, and to drill/mount the CPS in the bell housing. If you go to a 6 cyl, you will need to do something with you engine frame mounts, move them fwd I think. Also the T176 you have on the 360 is a long shaft one, you will need to get a short shaft one from a 285, or find a AX-15 and the 231 xfr case, or a NV3550 ( I believe a NP208 xfr case will bolt right up to that one, thats what I am wating for, prices to come way down) that will mate right up to the 4.0
Right now I am going through the the 83 engine harness and a 91 cherokee engine harness to mate the two for my stroker install.
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Unread 06-30-2013, 01:51 PM   #9
Duncan71
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1992 YJ Wrangler 
 
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So if I dumped a 4.0l, ax15, 231 combo into this, would I need new driveshafts as well?
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