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  4. We Assemble the Drivetrain for the 2020 Ultimate Adventure Long Range Jeep #UA2020

We Assemble the Drivetrain for the 2020 Ultimate Adventure Long Range Jeep #UA2020

Engine, Transmission, transfer cases and adapters to make it all work.

Truth is, the idea for building the 2020 Ultimate Adventure Long Range Jeep (or UA LRJ) isn't anything new. At its simplest, it's an idea for a unique vehicle that Editor Christian Hazel and Tech Editor Verne Simons have kept in the cue of cool vehicle builds since about 2012 or so. Its also a vehicle idea based on significant off-road history past. History that is inevitably intertwined with off-roading and exploration leading to adventure. It combines these human desires with the capability and utility of the first military jeeps that were the 4x4s that started formed the enthusiast based off-road world.

Engine and transmission for the 2020 UA LRJ

Off-road vehicles like the 2020 UA LRJ have at their heart some sort of powerplant, and while the WWII SAS jeeps were powered by the Go Devil 134 L-head 4-cylinder gasoline engine, times have changed. First almost all modern-day military vehicles run on Diesel. Also we have learned a lot about technology and efficiency since the days of WWII. Enter the Cummins R2.8L Turbo Diesel engine. Sure, you know we've built vehicles with this powerplant before (and will again), and that is for good reason. The modern crate ready Turbo Diesel makes 161 horsepower and 310-lb/ft of torque efficiently, comes with a 2-year, 2600 hour limited warranty, and comes with just about everything you need to make it run (that includes a fan belt, computer, engine wiring, a gauge, fuel fittings, accessories, a ton of stuff you'd still have to buy for that other engine swap. That has been more than enough to move the UA CJ-6D, The Derange Rover, and the Ultimate International up and down some of the hardest trails in the United States as well as carry these vehicles with confidence down the road between trail days. Course this engine needs a transmission and transfer case to distribute power to the axles and eventually the wheels. For that we stick to what we know works well with this engine and installed a Jeep Wrangler based AX-15 5-speed manual transmission from Quadratec. The transmission is adapted to the Cummins R2.8 using the official the Official Adapter Kit of UA 2020, Quick Draw Brand. That entails Quick Draw's heavy-duty adapter bell housing, and modified flywheel. To that we bolted a Centerforce II Clutch and pressure plate that came in our Centerforce Clutch kit. The AX-15 transmission from Quadratec is a brand-new unit, so ready to go (with the addition of lubricant). Quadratec has been around for decades and knows what parts Jeep owners need to keep their Jeeps on the road and trail. This transmission will keep the Cummin's R2.8 in its power band as we drive down the road and up a trail.

More Gearing for the 2020 UA LRJ

From there gearing comes from an Ultimate Adventure favorite, the Offroad Designs Magnum Underdrive unit ahead of a Ford (driver drop) NP205. The Magnum uses huge parts and when combined with the ORD prepped 205 we can either run 1:1, about 2:1, nearly 3:1, or a total of 5:1 reduction in the transfer case. That will give this Jeep the gearing to assault high speed off-road venues yet affords the gearing for true technical rock crawling. The gearing that the ORD Magnum and 205 allow is further enhanced by the triple stick shifting that is possible with this transfers case system. You can engage and disengage both front and rear axles as you see fit on the trail. This is especially helpful when used to pivot the vehicle in tight spots during turns, or off-camber maneuvering.

Mounting the drivetrain

All in all, this combination of parts pushes any thusly equipped vehicle to the pinnacle of capability off-road without compromise when it comes to traveling on-road. A combination that is perfect for any Ultimate Adventure vehicle. Assembling these parts takes some mechanical knowhow and some specialized tools but is quite simple. We to hold everything in place where we want we will modify a $250 Quick Draw Brand universal motor mount kit for the Cummins R2.8. To locate and support the transmission and transfer cases we are using pars supplied by ORD and some spare 2x6 0.188 wall rectangular tubing. ORD also sends polyurethane pucks to isolate the drivetrain from the cross member and we will show you how that all goes together once we get there. For now, we are in the throws of getting everything located just so. More to come.

Source:

Sponsors:
Cummins, 800.286.6467, www.cummins.com/engines/repower
Dana, 800.621.8084, spicerparts.com/applications/crateaxle
Falken Tire, www.falkentire.com/
IH Parts America, 530.274.1795, www.ihpartsamerica.com/
Offroad Design, 970.945.7777, www.offroaddesign.com/
onX Offroad, onxmaps.com/offroad-app
Quick Draw Brand, 513.446.9654, quickdrawbrand.com/
Quigley Motor Company, 800.233.9358, quigley4x4.com/
Skyjacker Suspension, 318.388.0816, skyjacker.com/
VooDoo Offroad, 844.866.3661, www.voodoooffroad.com/
Warn Winch, 800.543.9276, www.warn.com/

Other Sources:
Centerforce Clutch, 800.932.5882, www.centerforce.com/
Quadratec, 800.745.6037, www.quadratec.com/