1994-2004 Land Rover Discovery Upgrades – Four Wheeler Magazine

19 Apr 2015 | Author: | Comments Off on 1994-2004 Land Rover Discovery Upgrades – Four Wheeler Magazine

1994-2004 Land Rover Discovery Upgrades – Weak Links, Strong Fixes

23 Upgrades For ’94-’04 Land Rover Discoverys

From the Camel Trophy to the G4 Challenge, Land Rovers have long been recognized for their off-pavement prowess. The ’94-’99 Discovery and ’99-’04 Discovery II are some of the best of the bunch, sharing many of the same attributes as the famed Range Rover without the upscale price tag. The low gearing, solid axles, and flexible suspension provide Discos with a very capable platform that can perform even better with the parts and upgrades detailed below.

Weak Link: Front Driveshaft

Models Affected: All

What Happens: First-gen Discoverys have some odd front driveshaft geometry that can create problems with even minor suspension lifts. The U-joint angles are unequal, the differential and transfer box are offset, and the U-joints are clocked 40 degrees out of phase. Land Rover solved the front driveshaft geometry problems on the D II by adding a double-cardan (CV) front driveshaft. Unfortunately, they created an even worse problem.

The new driveshaft is not serviceable, is in close proximity to the catalytic converter, and the air-conditioning compressor drains onto the shaft. In other words, the catalytic converter bakes all of the lubrication out of the shaft and you can’t add any more. Unfortunately, the shaft will frequently break completely in half with very little warning and will usually knock a hole in the side of your transmission.

Weak Link: Rotoflex Joint

Models Affected: ’99-’04 Discovery II

What Happens: A rubber coupler called a rotoflex joint is fitted between the transfer-case output flange and rear driveshaft to attenuate driveline vibration and smoothly transfer torque to the rear axle. Although this makes for a quiet ride on the street, the rotoflex joints rapidly fail when subjected to high angularity and binding on the trail.

Sturdy Fix 1: A factory replacement rotoflex joint is available from your local dealer. The joints are reasonably priced, don’t take up much cargo space, and are easy to change out on the trail.

Sturdy Fix 2: An even better solution, although more expensive, is to scrap the rotoflex joint entirely and convert to a standard U-joint. Atlantic British offers a kit that contains all the necessary parts to bolt a U-jointed driveshaft and yoke on your Discovery.

Contact: Your local dealer or Atlantic British

Weak Link: Center Differential

Models Affected: ’99-’03 Discovery II

What Happens: The Discovery II has a center differential in the transfer case similar to an axle differential. The center diff transfers power to the front and rear axles for full-time four-wheel drive. Unfortunately, the differential does not come with provisions from the factory to be locked for a 50/50 torque split when off-pavement. The ’99-’01 1/2 D IIs have the internal provisions to lock the transfer case, but no method to engage.

The ’01 1/2-’03 D IIs must have the entire transfer case swapped out in order to have a locked low-range.

Sturdy Fix: In its final year of production, the D II came from the factory with a center diff-lock shifter to lock the center differential. The cable-actuated ’04 CDL shifter is available from Expedition Exchange and can be retrofitted to ’01 1/2-’03 D IIs. The CDL Kit is composed of all Land Rover parts and contains everything one needs to lock one’s CDL-ready transfer box, including the shifter knob, ’04 CDL shifter body, cables, and fasteners.

The ’99-’01 1/2 D IIs only need to be retrofitted with the necessary parts from a DI.

Contact: Expedition Exchange

Weak Link: Watts Linkage

Models Affected: ’99-’04 Discovery II

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