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Discussion Starter #1
I have lost overdrive on my 2005 chevy 5500 Allison tranny. Any quick fixes or do I look at an overhaul? I have 163000 miles on it.
 

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Are you sure your tranny isn't stuck in 4th? I had a Duramax do this to me, I think this might be what they call limp mode?
 
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