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I have 146382 miles on my truck. Original engine just rebuilt the tranny. The truck smokes cause of the valve guides but I don't know many chevies that dont...
I got 176K on the original motor and approx 40K on the 700R4 (previous owner doesn't know so he guessed). Doesn't matter since I will rebuild the other 350 in the garage later within the next 2 years.