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1989 mj

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Old 12-05-2018, 06:29 AM
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Default 1989 mj

I have a mj with a 2.5 and a 4.0 from an Cherokee 1991 I want to install it to my mj can I just drop it in and plug it in with the wiring from the 1991 and use the mjs from firewall back or will I need to do a full wire swap also and what else will I run in to doing this? Engine mounts fuel tank and what not thank you for any help on this topic
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Old 12-05-2018, 08:20 AM
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you will need everything.... I mean everything .....and I think you would have to weld in new engine mounts so to put it short its a big job
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Old 12-05-2018, 12:15 PM
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Yep. Everything. Cause 89 & 91 had entirely different engine management system.
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Old 12-06-2018, 01:06 AM
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motor mounts are different? I have done a couple Cherokee 89 with 1996 guts but never Comanche......



maybe i should do that 4.7 Chevy vortex or just do the 350 swap if itís all that I have a Cherokee with a 350 in it I think they used a 1988 v6 Cherokee body tho thanks for you help


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Old 12-06-2018, 08:21 AM
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yes engine mounts are in different locations on a 2.5 vs a 4.0
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Old 12-06-2018, 07:41 PM
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Default So when you say

you said I will need to do some welding I have to cut the old ones off?
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Old 12-08-2018, 01:10 AM
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Originally Posted by tinytrax78 View Post
you will need everything.... I mean everything .....and I think you would have to weld in new engine mounts so to put it short its a big job
well they are bolt on no cutting no welding and jobs done I am wondering about the fuel pump are they the same or different
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