The factory service manual has you check transmission and transfer case fluid levels by pulling the plugs. Our sight glasses eliminate that step and let you check levels at a glance — one for the transmission, one for the transfer case.

The factory coil location makes plug wires and coils very hard to reach, which adds difficulty to troubleshooting misfires when they inevitably happen. The kit moves the coils to the top of the intake manifold. The engineering behind it is in Coil Pack Relocation Kit — An Engineering Perspective.

The crankshaft position sensor sits right next to the exhaust manifolds and catalytic converter, and the radiant heat cooks it over time — the factory fiberglass shield burns off its reflective paint, crumbles, and stops protecting the sensor. The result is the D2's most common no-start: the engine cranks but won't fire once it's hot, and eventually quits for good, often leaving you stranded. Our aluminum shield bolts over the factory one and reflects nearly all of that radiant heat away from the sensor. See the engineering write-up and the video.

The D2 has a constant parasitic draw in normal operation. It's harmless if you drive daily, but let the truck sit a week or two and it'll flatten the battery — and repeated deep discharges damage it over time. Any tender counters that, but our solar charger means you don't need an outlet or to disconnect for the occasional trip. Just hop in and drive. More on the parasitic-draw problem in The Problem Keeping Batteries Charged in Occasional-Use Vehicles.

The factory engine-driven fan is prone to catastrophic failure if it isn't replaced every ~100k, and it's sub-optimal for fuel economy and low-speed temperature control. Our dual electric fan kit is close to optimal across all operating conditions. The full engineering breakdown is in Upgrading D2 Engine Cooling with Dual Electric Fans and the video.

The factory temperature gauge basically shows ranges — cool, sort-of-normal, overheated, and "you need head gaskets." Most owners want a real temperature readout, and there's no factory oil-pressure gauge at all, even though the D2 is known to break oil-pump gears and lose pressure. The trouble is where to mount gauges without a tacky stick-on look — so we designed pods that integrate cleanly with the factory instrument panel.

Years ago LR had an aftermarket supplier making cargo nets and guards to organize the cargo area. Those are long gone, so we recreated them — plus a few more: a roof/floor net, a dog-guard net, a side-window net, a storage-bin outside net, and a side-opening bin net.

The factory cargo bins are useful but hard to keep organized. We found latches that improve access so you can run a proper kanban-style system and keep your gear sorted.