The member asked whether a loud grinding noise and loss of movement while backing a 2006 Beaver Monterey from soft ground onto uneven hardtop likely damaged the Allison transmission or pointed to a driveshaft problem. Replies said the cause could be the transmission, driveshaft, differential, axle, U-joints, or possibly the torque converter, with several members leaning more toward an axle, driveshaft, or differential failure than the transmission based on the limited symptoms.
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The member asked whether a loud grinding noise and loss of movement while backing a 2006 Beaver Monterey from soft ground onto uneven hardtop likely damaged the Allison transmission or pointed to a driveshaft problem. Replies said the cause could be the transmission, driveshaft, differential, axle, U-joints, or possibly the torque converter, with several members leaning more toward an axle, driveshaft, or differential failure than the transmission based on the limited symptoms.
Members said there was not enough information to diagnose it remotely and suggested basic checks such as looking underneath, checking for U-joint or wheel movement, trying to move it again carefully, and listening for where the noise is coming from. Several also said a mechanic and possibly a wrecker would likely be needed to confirm the failure. Bottom line: the topic remained unresolved, with most members agreeing it is likely a costly driveline-related problem but no clear diagnosis from the information given.