wolfman
Registered User
Just pulled my 4900 lb camper with my 99 f250 SD, 7.3 PSD, 4r100 transmission. Had the transmission locked out of overdrive. About 20 miles into my trip, a sound started coming from the engine compartment that I can only describe as a fan coming on and off constantly. Turning the A/C off would stop it, and going into overdrive would stop it. Even with the A/C left on, it would eventually stop for a while, but would soon return. Towing in SC, so it is pretty flat but mighty hot. Talking to a friend with the same truck with a manual transmission, and he said his did it all the way from SC to Texas and back. Any ideas ? Also, shouldn't this truck be able to pull 4900 lbs in overdrive without trans damage. Thanks.