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Old 10-31-2007, 11:55 PM   #1
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been reading 2.5 to 4.0 swaps

been reading about doing this swap. sounds really easy so far. at least to me. i have absolutely no intention of selling my jeep since you can install the l6 or small block for less than i can find a tj of my year (1999) around me. but after reading alot of posts, i am still a bit fuzzy on a few things. i have a 1999 l4 5speed.

-this is what i think i need= motor, transmission, transfer case, pcm, and engine harness.

is the engine harness the only harness i need though? what about dash harness, or the fuse block harness?

does the harness have to come out of a tj? what about cherokee of OBD II era?

i do have a block from a 93 cherokee. with a newer harness, could the block be made to fit?

reason i am looking into a L6 instead of small block chevy is because i cannot find any info on the wiring of a SB, except for mr clifford's lt1

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Old 11-01-2007, 12:02 AM   #2
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oh, forgot about mounts and radiator. gotta get them. no biggie though. i've rebuilt this four banger twice since i have had it. second time was built by me. i am way to hard on the little motor with what i try to make it do, mainly on the highway. need more power.

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Old 11-01-2007, 05:28 AM   #3
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It's a little more money, but you should probably be thinking about a stroker, if you are killing 4 poppers, a good stroker will almost double your horsepower, but the install is exactly the same, obviously!
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And the most important safety, I never put my booger hook on the bang switch unless I'm ready to fire.
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Old 11-01-2007, 10:01 AM   #4
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need 4.2 bottom and 4.0 top with that right? is so, that would mean i need another motor from a older yj. mainly trying to keep everything looking stock. like the electrical and gauges. just have never found out for sure the answers to my questions.
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Old 11-01-2007, 12:49 PM   #5
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If you're gonna do a swap and replace the tranny/tcase, etc, why not just go with a small block V8? You'd likely want to replace the rear axle at a minimum though, in addition to the other stuff you mentioned.
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Old 11-01-2007, 09:52 PM   #6
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like a carb or fuel injection SB? i wouldnt mind doing that but what about original dash harness? i know that the gauges will have to be swapped, but how about all the other electrical in the cab? i have SBs that i can use but they are carbed. not sure if a wanna go back carbed. but i might for right now, could always swap manafolds later and do full fuel injection cant i?
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Old 11-02-2007, 07:26 AM   #7
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Talk with MrClifford. He put a V8 into his TJ (Fuel Injected IIRC)... he'd know more than me. I just reason that if I'm going to go to the trouble and work of an engine upgrade, may as well get something that will be noticeable.
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Old 11-02-2007, 10:15 AM   #8
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Originally Posted by psycopanther View Post
need 4.2 bottom and 4.0 top with that right? is so, that would mean i need another motor from a older yj. mainly trying to keep everything looking stock. like the electrical and gauges. just have never found out for sure the answers to my questions.
Actually, I think you can use the crank & rods from an old 258 in your existing block, check out a thread called colors, I think someone mentioned more about it there..

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And the most important safety, I never put my booger hook on the bang switch unless I'm ready to fire.
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