MJ Comanche Tech. Stock & Modified. MJ (86-92)
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xj to mj questions

Old 10-20-2014, 02:25 PM
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Default xj to mj questions

I resently twisted the frame on my lifted 2000 xj. Then wile crusing Craigslist and found a stock 87 mj with a blown 2.8 v6 and I was wondering what all can i swap out of the xj and in to the older mj
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Old 10-21-2014, 10:06 AM
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86 had the 2.8
87 had the 4.0

most everything from the xj should fit with some work, but putting a 4.0 in place of the 2.8 would be tough as the firewall was changed to accommodate the longer engine block in 87.
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Old 10-21-2014, 10:20 AM
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You could put the engine from the 2000 in with older wiring, but doing a complete 97+ swap is a TON of work. Making different holes in the firewall for the different steering columns, all wiring, etc. However I just swapped everything from a 93 XJ into an 87 MJ and that was easy, everything bolts right up, and that would be the same for any 96 down.
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Old 10-23-2014, 07:49 PM
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It's more than just holes on a 2.8 engine bay. The entire firewall is different and the engine bay is too small to fit a 4.0 without extensive modification to the engine bay. It's easier to just swap in a better GM motor. There's a few options that will bolt right in.
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Old 10-23-2014, 08:00 PM
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A vortec 4.3 would be neat
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Old 10-26-2014, 06:47 PM
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A GM 3.4L V6 is a plug n pray replacement/upgrade for the 2.8L
A BFH would get the bulkhead adjusted to squeeze a 4.0L in.
Maybe consider an LSx swap tho..
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Old 10-26-2014, 07:01 PM
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Originally Posted by Metmknice View Post
A BFH would get the bulkhead adjusted to squeeze a 4.0L in.
Ghetto
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Old 11-02-2014, 04:43 PM
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Originally Posted by bighouts5591 View Post
A vortec 4.3 would be neat
Rustys makes motor mounts those now so go 4.3
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Old 11-03-2014, 07:58 PM
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Originally Posted by Neo101288 View Post

Rustys makes motor mounts those now so go 4.3
Uh, not sure what you're trying to say.
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Old 11-10-2014, 09:12 PM
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Rustys makes the motor mounts for the 4.3 to go in the Comanche along with a few 9ther Chevy motors
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Old 11-11-2014, 07:44 AM
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Originally Posted by Neo101288 View Post
Rustys makes the motor mounts for the 4.3 to go in the Comanche along with a few 9ther Chevy motors
Ok. It was just worded funny. No worries
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Old 11-11-2014, 08:24 AM
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Yea was trying to use the ole smart phone as a computer doesn't work to well lol
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Old 01-04-2015, 07:09 PM
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it doesnt take that much work to put a 4.0 in the 86... the area on the firewall needing to be clearanced isn't that substantial. A very manageable swap... other things would be radiator mounts and core support... trans crossmember will need new mounting holes as well. More than likely a custom length rear driveshaft too.
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Old 01-09-2015, 06:44 PM
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None of this changes the fact that the 2.8 wasn't an option in 87 so either the year or the motor is wrong. If it's the year then a 4.0 is a very easy swap, if it's a 2.8 then a 3.4 GM V6 is just as easy, a solid motor, and an infinitely better choice than the 2.8.
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Old 01-17-2015, 06:57 PM
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Had a 2.8 in my 84 cherokee definitely a junk motor even though I could beat a 4.0 off the line from 0 to about 20 mph lol. No matter how many gaskets/rtv I threw at it a month later it would start purging oil out of the valve covers again.
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