Jeep guys, 4.0, WJ versus TJ
#1748951
02/08/15 02:02 AM
02/08/15 02:02 AM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
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Finally investigated why my Fiance's old 2001 WJ 4.0 quit last winter. Turns out it looks like it has the dreaded early "0331" cracked head at about 180K miles. I've found a 2002 4.0 from a TJ Wrangler. Fella is converting to diesel for his crawler and doesn't need the stock engine anymore. Do Wrangler and GC use the same 4.0 engine block in '01 & '02? So I could swap the 2002 Wrangler 4.0 into the 2001 GC directly? The '02 engine would get me the updated head, so the crack won't happen again. Then my other choice. For about the same money ($700), I could buy a used '02-04 head + a light rebuild on the stock '01 short block. Lots of labor for me, but I'd know what I have when I'm done. If the short block is hurt (beyond bearings), this bet would be off because the cost would escalate. Or, just swap in the complete Wrangler engine (100k miles) for the same $700 and hope for the best, quicker and less labor intensive. Either engine would get a new oil pump, front and rear seals and core plugs while the engine is out. Your thoughts?
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Jeep guys, 4.0, WJ versus TJ
[Re: GO_Fish]
#1748952
02/08/15 11:35 AM
02/08/15 11:35 AM
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Joined: Jan 2003
Posts: 4,696 enfield, CT
ViperDave
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the engine should be a direct swap. 2000+ TJ and WJ used the same engine AFAIK
The XJ/early TJ block has different engine mount points if I remember correctly
67 Dart GT Vert 273/904 72 Town & Country 440/727 90 D350 reg cab dually cummins 15 Scat Pack Challenger
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Re: Jeep guys, 4.0, WJ versus TJ
[Re: ViperDave]
#1748953
02/08/15 04:45 PM
02/08/15 04:45 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
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Thanks Dave. I would have bet a small amount of money the WJ and TJ blocks were the same, but not $700. It was in the back of my mind that Wrangler 4.0s did have different engine mount bosses at some time in the earlier years.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Jeep guys, 4.0, WJ versus TJ
[Re: GO_Fish]
#1748954
02/08/15 09:57 PM
02/08/15 09:57 PM
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Joined: Apr 2010
Posts: 10,570 Sunny South Florida
Golden-Arm
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I Live Here
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it's the same, but make sure you get a good set of pics, or hand drawn diagrams, showing every switch, sensor and connector. there could be slight differences in these pieces, year to year.
"When Tyranny Becomes Law, Rebellion Becomes Duty"
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Re: Jeep guys, 4.0, WJ versus TJ
[Re: DaytonaTurbo]
#1748957
02/11/15 01:00 AM
02/11/15 01:00 AM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
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I'm really torn on this. Not sure I even should put $700 in her old WJ and run it myself, or part it out & save its good parts for the WJ she's driving now. Money's tight now, hard do justify putting money into this when I don't really need another vehicle. Just that the WJ would be a little easier on gas as a work truck than the full size Ram 4x4 I'm running now. A few MPG better than the truck, but not a lot. Insurance on another vehicle? Uggg. Another vehicle to care for? Uggg.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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