Swappin a 90 4.0 for a 91 or new 4.0

[XJFire]

Unforetuneately I have a 90, which isn't the HO and aftermarket parts such as headers are alot less common. What is involved in swapping the engine, its it a straight switch or what exactly is involved? What year is recoomended?

[Chero-King]

Do a search on this, it's been covered so many times, it's not even funny.
But so I dont seem like an ass.....
You'll need to switch over all the electronics with it as 90 and previous use the Renix style system.
Also most of the HO's use an open cooling system, which doesnt "need" to be switched but is easier to use maintnance wise.

[XJFire]

Yeah I didn't mean to post a new thread, and I can't delete, sorry, not used to this forum system. Not a forum noob tho :looney:

[Chero-King]

Haha, no problem, I did the exact same thing when I came to this forum, it takes a bit to get used to.

[XJFire]

what should i search for in a good thread? high output or engine swap?

[Chero-King]

I just quickly did an advanced search for you, and used "High output + swap" as keywords, only searched in the OEM and Modified tech, and came up with these results. Theres gotta be something useful to you in here.
http://www.naxja.org/forum/search.php?searchid=1210039

[XJFire]

thanks bro

[jeepnuts311]

Unforetuneately I have a 90, which isn't the HO and aftermarket parts such as headers are alot less common. What is involved in swapping the engine, its it a straight switch or what exactly is involved? What year is recoomended?

you're lucky to have a '90 IMO. i prefer the renix system over the OBD system anyday.

but, my brothers MJ has the best of both worlds, the renix computer/ignition system with a 97 motor and head. you can swap the block/head and keep the old ignition system.

oh, and the bolt-ons for the H.O arent really that awesome. just stroke your renix and be glad you have a knock sensor

:)

-Tim

[88MJ88XJ]

where can i find more info on your brothers mj with the swapped 97 motor? i want to swap a 98 motor into my 88 mj.