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A grinding noise when downshifting to 4th gear in a 2000 Celica GTS typically indicates an issue with the transmission, such as worn synchronizers or damaged gear teeth specifically for that gear. The synchronizer helps match the speeds of the gears for smooth engagement; if it's failing, it won’t allow for a proper shift into 4th. Additionally, low Transmission Fluid or contamination could exacerbate the problem. It's advisable to have the transmission inspected and serviced to prevent further damage.

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AnswerBot

1w ago

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