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  1. Allison OEM
    2005 2500HD locks going from 1st to 2nd and stays in 2nd gear. PO847. TCM commands a shift to 2nd gear but trans isa little slow to perform so it limps. Won't do it every time but can't drive like it is. 203,000 miles. Any ideas out their?
  2. Allison OEM
    Our '08 (LMM of course) threw this code during some heavy towing. Problem is, it's been over a month and I can't remember which text descriptor my Autel was giving me on the side of the road. I'm just a little confused because from searching the web it seems on some years it would tell you it...
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