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Originally Posted by keg
87 Silverado 350 4 speed auto. After replacing the trans filter and fluid it takes longer to shift and shifts hard most noticeable from 1st to 2nd. The only thing I did was change fluid and filter, or is there something I may have done or not done that caused this change in the shifting?
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How was the fluid you drained originally? Was it dark with metal flakes? A lot of times transmission fluid that has not been changed in a while or is in poor condition is actually whats making your transmission still shift good. You most likely have a 700r4 which is not a good transmission in stock form. I would check to make sure the fluid is at the proper level.