The Garage is a "mechanic's garage" where you can build custom cars. It currently costs 300 gems to unlock. It's possibilities range from upgradeable parts like Inline 4 engines to Diesel V8 engines, along with different types of body frames, and even different kinds of tires.

The Jeep body, (shown below) is a basic body for a custom car. It looks and acts like the normal Jeep. The Jeep body is a common car body found in gift chests.

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Jeep body; common

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Rally car body; rare