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Ok 96 K1500 just hit 50,000. At 46k I dropped pan/new filter and replaced what came out. Fluid looks clean! When cold it sometimes has a hard shift into second but otherwise shifts smooth. Any thoughts on whether to do anything like fluid exchange through cooling lines, transmission flush/fill(at transmission shop) or just leave it be? I’d say aside from fluid I replaced, the rest is 25 year old OE fluid.Btw-I did just add auxiliary cooler!
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