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As mentioned above, I would find another dealer. We had a transmission problem while down in the RGV, and I took the truck to Brownsville. The transmission man there had never worked on an Allison. Ended up at Kingsville, as they had a good Allison mechanic. Turned out it was a contact on the ignition not sending voltage to the tranny. Allison would shut down to protect itself from damage.
I'm curious about the cooling fan. No way you could miss the one on the GMC coming on. Heck, you can't hear the radio when it runs at full lock up.
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