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Slipping in OverDrive

638 Views 6 Replies 4 Participants Last post by  mbalius922, 
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I have a ‘96 3500 dually. No performance parts besides air intake and intake manifold. And it only has 105k miles on it. And it seems like my transmission is slipping into overdrive. It shifts pretty normally before I hit overdrive, but sometimes it will rev up and abruptly shift into od. It’s a lot worse lately slipping about every time I hit overdrive. I don’t know if it’s electronics related. Or my tranny going out. I know when I got my trans fluid changed he said there were a lot of aluminum bits in the pan. So my trans is probably on its way out. But I expected it to last more than 100k. Just wanted some thoughts?
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When I bought my 95 3500 it had 56k on it. It started shifting in and out of OD. The tranny shop told me the rear pump was shot. I suspect it was used to tow in OD without the owner noticing it shifting constantly.
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So much for honest trans shop.
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