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Q: i have 2003 trailblazer the trans has not been serviced in 150000 mi. will it on 2003 Chevrolet Trailblazer

harm it to do it now
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IF you do anything at all , DO NOT flush!!! Only drain & fill (will probably need filter and pan gasket on that) With that mileage , I would strongly suggest ONLY FACTORY parts and fluid!!
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