Ideas/Suggestions for LS Motor Swap, HELP!!! -
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post #1 of 5 Old 07-31-2012, 08:02 PM Thread Starter
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1979 CJ7 
Join Date: Jul 2012
Location: Eddy
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Cj Ideas/Suggestions for LS Motor Swap, HELP!!!

Heres the facts:

I have a 1979 CJ-7, all stock except 4in suspension, and 3in body and minor upgrades on accessories.

Electronic motors are not in my "experience", Everything has a Carb, and I stay away from computers and sensors.

Its time for more power, and a V-8, L33 will be the donor for the transplant from a Z-71. I have complete motor, trans, and T-case There is nothing wrong with motor, 4L80E trans, or the T-case.

Motor conversion for me is not an issue, its the electronics that I'm not familiar with. I want to put the motor in, with the auto tranny and T-Case I already have from the 2005 Z-7. I want to keep everything electronic like it was in the Z-71, push button 4wd, electronic ignition, elect fuel, computer, sensors everything.....

If I have to swap T-case, I have found an adapter already. now with front axle being reversed, this bring up any big issues? Should I plan on finding some axles too? If so, what is the easiest to work with that I can find in a junk yard? I'm thinking older chevys with Danna 44's or something from a old ford.

Give me you ideas, suggestions, I've put alot of planing into this already, and want other opinions before I start, jus to see if I have missed anything. Be respectful, we're all grown.

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post #2 of 5 Old 08-01-2012, 05:31 AM
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1984 CJ7 
Join Date: Feb 2010
Location: Chester Springs, PA
Posts: 567
The wiring is a lot easier than you think. Basically lay out your harness on the engine, plug everything up, make sure you find ALL the grounds (there are a whole pile of them) and connect power to the computer...gotta get a high pressure fuel pump...may as well get one from the same model truck you have the drivetrain out of and put it in your CJ's tank. Basically got to make the engine "think" it's still in the truck it came out of. It's really not hard to swap, there's tons of information out there on the interweb.

As far as axles go, with this transfer case drop being on the wrong side -- one of two things you can do here. You can swap your CJ case onto the back of the 4L80E, but then you'll need to adapt a VSS (vehicle speed sensor) to it so the engine will still run properly. Not hard, you can just order one from or other places or eBay. Or, if you want to swap axles, which isn't that hard to do can get a 44 front out of an early Bronco (76-77, so they have disc brakes) or out of a late 70s-80s Jeep Wagoneer. The early Bronco 44 will have the correct side drop and is not much wider than the CJ axle. The Waggy axle is a little wider, so you may want to get both the front and the rear. You'll just have to check gear ratios to make sure you either match what you have, or get matched gear sets and go from there.

Good luck! This isn't a hard swap at all...Seems like it'll be a fun project!
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post #3 of 5 Old 08-10-2012, 03:22 PM
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1984 XJ Cherokee 
Join Date: Sep 2010
Location: mesa
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The engine realistically will only take a few power wires hooked up and a lot of grounds and should fire up. As said you will need fuel pump. And to run a return line possibly for fuel.

If you have a Dana 300 t case you won't want that and should send it to me immediately! I'll save you the headache lol.

84 xj 350tbi, sm465, 203/205, 60/70. links and other junk.
what size sawzall blades does it take to fit 40's?
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post #4 of 5 Old 11-25-2012, 11:13 AM
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Join Date: Apr 2012
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My cj8 has a similar setup. One thing we ran into was 97 and later 4L80 transmissions don't have the rear speed sensor in the trans. They are in the transfer case. If you adapt to your Dana 300 you will need to pull the trans apart and install the exciter ring. Then mount the sensor. Not expensive. Just more work. Have you measured the OA setup? In a 7 you are going to have a very short driveline.
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post #5 of 5 Old 01-26-2013, 07:36 PM
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1989 YJ Wrangler 
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Nice Job!
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