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Lost O/D in 03 2500 HD

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Old 03-18-2012, 06:29 PM
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Default Lost O/D in 03 2500 HD

I was going 70 mph for about an hour with the cruise control on. unloaded on flat ground, no hills when it shfted into 3rd gear. I pulled over and checked the fluid,not burnt trans temp gauge said about 180 degrees, engine temp was normal. took off again, still no 4th gear.what could this be?
03 2500 HD 6.0 2WD 192000 miles
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