Question about 2001 Dodge Ram 1500 Truck 2WD

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Transmission code P1740

My service engine light came on the shop said the code is P1740 but did not know what it meant also when driving in over drive at a steady speed the engine rpm go up and down appox 500-600 rpms also when I step on the gas to increase speed the heater door falls shut and no heat comes out of the dash as soon as I leasve off throttle the door opens and heat or a/c comes out the dash vents are all thease items related to each other thanks 2001 Dodge Ram 2wd drive small v8 engine

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  • Anonymous Mar 01, 2009

    for the vent changing all you need is to replace the one way vacume valve from the engine to the firewall .. five or ten bucks at your dodge dealer...

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The transmition is slipping, dodge trucks are noted for their tranny problems, I just replaced mine ($2400)bearly over 100,000 miles on the truck. Watch the engine temp if you keep driving it. It may start to over heat. Get it to a reputable transmition shop ASAP,Some place that garentees/warentees their work.
As for the heat/AC I would check for vacuum leaks. Get either a Hanes or Chilton's manual for it and it will tell you how to check the system.

Posted on Jan 26, 2009

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Go to autozone or advance auto they will scan it for free and tell u what u need to fix it

Posted on Jan 26, 2009

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