I bought a Challenger R/T '70 and added the first level of tuning mods. When I am in top gear, there is a solid red light near the gear indicator and the engine begins pulsing. It looks like there's a rev limiter or something. Then everybody passes me, so I know something is wrong. What does this mean?
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You are hitting the rev limiter. The gear ratios on the muscle cars are fairly close so if you want to achieve a higher top speed, purchase the 5-speed close ration transmission (which will give you an extra gear but isn't adjustable) or the fully customizable transmission ( which will give you an extra gear and allow you to adjust each gear's ratio individually). The fully customizable transmission is the best option if you want to maximize top speed and avoid hitting the rev limiter.