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Problem 02 GMC 2500 Diesel and Allison


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Just got it a week ago and now a problem already. Brake light comes on along with ABS a couple days ago nothin seemed wrong and it went away. Well today after pulling a 12000 lb wagon i got on the road and about 5 minutes later my speedometer goes wacky and the brake light, ABS and service engine light come on. I turn around and when I am in 2 hi it wont shift out of it. I think its a problem in the 4 wheel drive becuase in 4hi when driving now i kinda here a clinking noise. Anybody have problems like this with theres?? Now the service engine light stays on but not the brake or ABS light anymore. I dont know what the hell is goin on.

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