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  1. J

    Mike L has passed away.......

    RIP Mike. I never met the man, but his work and knowledge here has touched my life already. Grateful to say the least. The thought of losing another great mind and mentor in this world hurts. A teacher from the heart. Good man. A life and legacy to remember.
  2. J

    LB7 Trans issue

    Well Gentlemen, I can't thank you all enough for your depth of knowledge on these machines. Nail on the head. I found a used-but-good TCM locally, put it in, and every single issue disappeared. All codes cleared themselves. I test drove the truck on the highway, all shifting as per normal...
  3. J

    LB7 Trans issue

    Wow! Great test! Yes, the truck goes into both reverse and 3rd gear with the 20 pin disconnected. I literally just changed the pressure switch and internal filter while I was there and had all the same symptoms. Then I saw this. The temperature was bouncing like a ball immediately after...
  4. J

    LB7 Trans issue

    Ok, I'll see if I can get my hands on another TCM just to test. I've got a new switch, 20 pin connector seal, NSB wiring harness ready to go in next, hopefully not just a waste of effort, if the TCM is bad..
  5. J

    LB7 Trans issue

    I've had some shifting issues start happening, infrequently at first, now the truck won't shift into gear at all. Limp mode, no reverse, shift range inhibited, random up and down shifts. 2003 LB7 with Allison transmission. Codes PO700, 711, 748, 778. Seems all electrical. I've changed the...
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