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The Caster Correction Offset Bushings adjust the caster angle back towards the stock setting after lifting your G Wagon. This benefits the driving feel by aiding the suspension and braking system from increased forces that come after lifting your vehicle. A positive caster is required for a vehicle to function. Going to a negative caster angle will make the vehicle undriveable. For lifts beyond 2 inches, these may not adjust your caster all the way back to stock but can still benefit the caster angle and performance of the truck.
If you have lifted your G, the suspension geometry has changed. This can be an issue because now, the suspension and braking components are facing higher forces while driving. The higher you lift your vehicle, the more neutral (and ultimately negative) your caster will go. As a rule of thumb, you always want your caster to be positive. While a 2" lift doesn't change the caster all that much, it does change it towards more neutral. The closer to neutral you get, the harder it will be to control the vehicle as this greatly effects the position, angle, and alignment of essential suspension and braking components. Depending on your vehicle model, the lift used, and the weight added to the vehicle, caster angle will vary but we have found a 50mm lift to be a good threshold for adding the offset bushings.
When it comes to the W463 chassis, the caster adjustments are fixed. This means there aren't any adjustments that can be made from the factory. When it comes to lifting the G-Class there's only a few options to correct this. Installing these caster offset bushings, lowering your control arm brackets, or installing new control arms with caster built in. For mild lifts, these are the quickest, most straightforward, and most economical solution.