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  1. SpenserAK

    80 series CDL SWITCH TRANNY

    You’d have to get an expert to chime in, but I don’t really see how, as all it’s used for is locking & unlocking the center diff. If you drove on dry pavement with it locked, and were turning a bunch (which you should not do) it might be able to put enough stress on the driveline to eventually...
  2. SpenserAK

    80 series CDL SWITCH TRANNY

    Had you started the engine before you checked it? Anyway, too much fluid can cause problems, just like too little. My guess is the fluid was old and essentially worn out, not providing proper lubrication, and perhaps the level was wrong too - now that you have the correct level and at least...
  3. SpenserAK

    80 series CDL SWITCH TRANNY

    Truck should be warmed up & running when checking transmission fluid, on level ground & in park - I would do it again to get a better idea of fluid level. If it’s correct, I would still drain & refill with correct fluid a few times as mentioned, to offset the old stuff, driving a while in...
  4. SpenserAK

    80 series CDL SWITCH TRANNY

    So the fluid is of unknown age, and the truck doesn’t get driven much? Did you check the fluid level after a full warm-up, with the engine still running? Hopefully we can help you get to the bottom of this, but in your position, I would first do a few drain & fills of the trans fluid to gently...
  5. SpenserAK

    80 series CDL SWITCH TRANNY

    The switch should only actuate the center diff lock. Need more information. How was the truck driven before installation? Daily? Rarely? How did you drive it after installing the switch - did you engage the center differential, or just install it and drive like normal without pressing the new...
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