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Old 03-13-2009, 03:28 AM   #1
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Cool motor swap opinions (gas v diesel)

just bought an 03 rubi with 65,000 miles on the clock. moving out of new jersey, pita inspection state, in 3 months and want to do a swap as soon as i get out of here. im keeping the 241 case any way i go and will either go with a th400 or a 4l80e trans, either one with a reverse full manual valve body. so if you had the choice would you go with a gas or a diesel? gas motor would probably be a chevy lq9 (an ls2 but with a bigger bore and not aluminum) and diesel would be a cummins 4bt. i can build the lq9 to 400+ hp easily but it will never have the low end torque of the diesel. i can get the diesel around 200-250 hp and still get good mpg but it will never have the top end of the gas motor. i know the 4.0 weighs in around 500 lbs, the lq9 ~600, and the 4bt ~700 but i dont know how big of a deal it will be in the jeep, its NOT a performance car any way. im not going for speed but it needs to be able to cruise on the highway at 70mph. i can run the diesel on wvo or make bio for it so it would be cheap to run. jeep is going to be my dd/weekend trail runner so it needs to be reliable. im not going to run much lift, probably 2.5-3", but i am going to run a highline kit and either 35 or 37" tires on it. i will regear the axles either way because i know they need stronger r&p gears to take on much more than the 4.0 can give them.

sorry for the rambling but i need opinions and first hand experience here because i cant decide. btw, since i know i will be asked this, i want to swap because i just cant stand having the jeep stock lol. its a problem we all have.............but i like it.

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Old 03-13-2009, 04:21 AM   #2
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at least you're smart and getting out of jersey, too bad i cant say the same for me :-(

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Old 03-13-2009, 01:09 PM   #3
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lol. im still not sure if im smart or stupid...... i traded in a 2001 bmw 740il sport to get the rubi. you should have seen the look on the sales guys face when i told him what my trade was... PRICELESS

i could probably get away with the gas swap in jersey but im pretty sure they wouldnt like the diesel.
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Old 03-13-2009, 09:31 PM   #4
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Got something against aluminum engine blocks?

If my 4 liter ever quits on me, I'm going to go steal a LL8 out of a Trailblazer. Check out the numbers!
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Old 03-13-2009, 11:55 PM   #5
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i vote diesel for no more reason than i think they are cool, and know they are more efficient and have better low end torque.
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Old 03-14-2009, 12:00 AM   #6
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when my trusty i6 takes a dump on me.. ill be doing a 4bt cummings swap.. ive already told my dads friend they he will be helping me.. my dad laughed at me but his friend loved the idea.. heck his friend was the one who told my dad that jeeps were made to offroad when my dad got upset i lifted it and put mud tires on it =p
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Old 03-14-2009, 12:31 AM   #7
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Well if my engine goes out in my jeep I would go with the diesel. I expect to get at least 250,000+ miles on my 4.0L i got now of course. but Diesel engines are very reliable and Simply said bio diesel is just cool.

Nothen can say man like Diesel kan
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Old 03-14-2009, 03:58 AM   #8
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doesnt some bio diesel tend to not like cold climates well?
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Old 03-14-2009, 06:36 AM   #9
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Few things to ponder. with 35-37 tires its not the RP you need to worry about its the factory locker and front axle shafts in the ruby. Also you will need to upgrade the brakes as stopping with even 35's let alone 37s will push the stock system to the limit and beyond. Upgrade the steering. Axle gears will need to be in the area of 4.56 or lower. As for a swap if I had to pick, V8 as you can find parts easier or in out of the way places. Granted I would just leave the 4.0l in and be happy.
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Old 03-15-2009, 08:26 PM   #10
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Go with the diesel. When the 360 in my uncle's SJ died we swapped in a 5.9L Cummings from a Dodge Ram. It has amazing about of torque and gets around 25-26 mpg on the highway.

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