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  4. Holding the Drivetrain in the 2020 Ultimate Adventure Long Range Jeep #UA2020

Holding the Drivetrain in the 2020 Ultimate Adventure Long Range Jeep #UA2020

Part 3: We build a T-case crossmember and firm up some motor mounts.

In our last installment, we talked about some of the parts that make up and hold together the 2020 Ultimate Adventure Long Range Jeep's drivetrain. The R2.8 Turbo Diesel from Cummins is mated to a Jeep Ax-15 from Quadratec using an adapter bellhousing from Quick Draw Brands. Inside the bellhousing is a Centerforce II clutch and pressure plate on a Quick Draw Brand's machined flywheel. Aft of the transmission is a Magnum underdrive box from Offroad Designs that confidently turns the ORD Ford NP205 transfer case into a 4-speed unit capable of 1:1, about 2:1 (1.96:1) about 3:1 (2.72:1) and about 5:1 (5.33:1). All these awesome parts must be secured to the frame of the Jeep so the power and gearing can be transferred to the Ultimate Dana 60 axles before turning Trail Ready beadlock wheels and Falken tires.

Frame Side Motor Mounts

To hold the engine in place we used four pieces of 3x 3/16 plate to construct frame side motor mounts. In years past, we've cheated the Cummins R2.8 over to the passenger side of the frame to better help with driveshaft and axle clearance, and the 2020 UA LRJ is no exception. The engine and transmission are offset to the passenger side 2 inches. That makes the driver-side frame side motor mount longer than the stubby passenger-side mount. We used cardboard to help design the shape of the frame side motor mounts or stand-offs, tack-welding each piece into place as we went. We did get some universal motor mounts from Quick Draw Brands, but after much deliberation, we decided to make our own. These motor mounts would be perfect for a vehicle with framerails that have less contours than our TJ/LJ framerails.

Building a Transmission/Transfer Case Cradle

With the engine located and held in place with the engine hoist and our tacked motor mounts, we could firm up the location of the transmission and transfer case with our custom crossmember and transmission mount. We showed you some pictures of what we'd started for this. We used a piece of 2x5x0.188-wall (3/16) rectangular tubing as our base. We then miter-cut the rectangular tubing so the Jeep will have a smooth belly but will also have enough clearance for the front driveshaft and exhaust. The main cradle is isolated from the transmission and transfer case using some polyurethane pucks that were originally intended as early CJ-5 body mount pucks. The pucks sandwich a bracket that is bolted directly to the transmission and transfer case between the motor mounts, and this cradle the drivetrain can move under load a touch and vibrate.

What's to Come

Next our plan is to install some steering parts and set the wheelbase of the suspension using some parts from our 2020 Ultimate Adventure Sponsor Skyjacker suspension. We will also be installing a drag link and tie rod from Rare Parts, as well as a rebuilt steering box from Redneck Ram and West Texas Off-Road that's been ported for a steering ram.

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:
Daystar, 800.595.7659, www.daystarweb.com/
Centerforce Clutch, 800.932.5882, www.centerforce.com/
Quadratec, 800.745.6037, www.quadratec.com/
Rare Parts, 800.621.2005 , rareparts.com/
Redneck Ram/West Texas Off-Road, 877.833.7464, www.westtexasoffroad.com/
Trail Ready Wheels, 425.353.6776, trbeadlocks.com/