It's Time to SUPERSIZE Moby - MoTech 6.2L LS Jeep Motor Swap

CarsonCindy

Administrator
Staff member
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Yup, you guessed it.... the time has finally come to give Moby a little boost in power! We weren't planning on it but, with all the headaches we've been having with our transmission, we decided to stop throwing money at it, take the plunge and do a motor swap... but not a HEMI. After a lot of research, we decided to go with an GM LS 6.2L V8 (L94) and 6L80 automatic transmission using the MoTech LS kit with a heavy duty radiator. We hope to run this with a 3:1 Atlas 2-speed and brand new Dynatrac ProRock 80 rear axle to soak up all the additional power. This thread has been started to document the process of our Jeep JK Wrangler LS swap and we hope that you'll enjoy the build. :cool:

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THE PLAN:
  • LS 6.2L V8 (L94)
  • 6L80 6-Speed Automatic Transmission
  • MoTech LS Basic Kit
  • Heavy Duty Radiator
  • Advance Adapters 3:1 Atlas 2-speed Transfer Case
  • Dynatrac ProRock 80 Rear Axle
  • ATX Slab Bead Lock Wheels
  • NITTO 40x13.50 K-Spec Trail Grapplers

LS SWAP UPDATES:

THE PROCESS:

THE PARTS:

THE COST:
(so far - not including tax or shipping)
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VIDEOS:

Let the SUPERSIZING Begin : Short Timelapse Video of Moby's LS Swap


Just for fun, here are the listed horsepower and torque numbers for a stock Jeep JK Wrangler 3.8L V6 and 3.6L V6 Pentastar motor compared to a 6.2L V8 motor:

Jeep JK Wrangler - 3.8L V6
205 hp @ 5,200 rpm
240 ft-lbs. @ 4,000 rpm

Jeep JK Wrangler - 3.6L V6
285 hp @ 6400 rpm
260 ft-lbs. @ 4800 rpm

GM Vortec L94 - 6.2L V8
403 hp @ 5700 rpm
417 lb-ft @ 4300 rpm


Time to Start Shopping
First on our list was to find a used LS engine/transmission from a 2007+ Silverado, Yukon or Escalade. From what we were told, it would also have to be from a truck/SUV that was a 4WD. After doing some searching, we finally found what we were looking for, a 2011 Yukon Denali 4WD 6.2L motor and transmission and if you can believe it, it only had 12,000 miles on it! Here are a few pics of it at the junkyard we found it at:

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After checking it out, we agreed it was too good to pass up and so, we went ahead and bought it. :) As you can see, it is now sitting at Off Road Evolution with Moby just waiting for more parts to show up!

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We've got more parts on order and will be posting them up as they come in. Be sure to check back for updates :cool:
 

Skid_Kid

New member
Awesome! Two questions, cause Eddie has said wheeling with an auto is like cheating, so why go with an auto? Or is a manual not an option?
 

ttfhell

New member
It's Time to SUPERSIZE Moby!

That's awesome! Except now I have engine envy on top of everything else.


Sent from my iPhone using WAYALIFE mobile app
 

Topper

New member
It's Time to SUPERSIZE Moby!

Awesome cant wait to see Moby come back to life it's been to far to long with out him.
 

wayoflife

Administrator
Staff member
Awesome! Two questions, cause Eddie has said wheeling with an auto is like cheating, so why go with an auto? Or is a manual not an option?

A manual was an option but one we decided against - more because we would really start to break stuff than anything but, also because wheeling on really hard terrain in an auto is just so much easier. :cool:
 

FallonJeeper

New member
And bonus, you can install the intake so that the throttle body and air filter face the firewall. Not that it's something you need or want to do, but it's an option.
 

Prime8

New member
It's Time to SUPERSIZE Moby!

Holy crap! Awesome! For curiosities sake, how much did you pay for the engine and trans at the junk yard?
 

Bullwinckle

Hooked
It's Time to SUPERSIZE Moby!

😮 Once again you guys are making Moby more and more bad ass!!! :rock: ill be following along with lots of interest. :D


Ray ⛺
 

wayoflife

Administrator
Staff member
Holy crap! Awesome! For curiosities sake, how much did you pay for the engine and trans at the junk yard?

Actually, we got real lucky and paid only $5,500 for it. We found others with over 70,000 miles on them that cost about $7,000 so, we think we got a pretty good deal.
 

Prime8

New member
It's Time to SUPERSIZE Moby!

Actually, we got real lucky and paid only $5,500 for it. We found others with over 70,000 miles on them that cost about $7,000 so, we think we got a pretty good deal.

That's awesome! Great price. Interested to see what the additional wiring and fixtures, plus labor will cost.
 

Hack12

New member
It's Time to SUPERSIZE Moby!

Wow, how exciting! That's a really great price too. Best of luck, can't wait to see some videos once it's installed!
 
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