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Old 10-14-2013, 11:13 PM
jaywmiller1972 jaywmiller1972 is offline
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Unhappy 05 ram 2500 st 5.7 hemi quad 4x4 shifting problem (Ithink)

Hello All! Gkad to be here. I have an issue with mt 2005 Ram 2500 ST 4x4 Quad cab 5.7 Hemi. Hopefully somebody can help. When driving down the road, say on the highway, when I come to a hill(even a small one) I have to press on the gas pedal alot to get her to kick down. Even when I am in cruise control and driving. If I am going 60mph and I come to any hill, then the speedo drops to almost 50mph before it downshifts. And at that point the RPMS are way to high and then it wants to shift back into drive. I realize that there is no overdrive. There is a tow/haul button on the gear shifter. I had the fuel pressure checked and it was 57psi. Is it the throttle control sensor? Is it the two catalytic converters are needing changed? As far as I am aware of, it has never been chipped or anything. Also my fuel mileage is not as good as it should be. 9 in town, and 12.5 on the highway. I put a cold air intake on and it seemed to help, but not with the shifting issue. I still get about 9 or so in town, and about 14 on the highway. I've changed all 16 spark plugs too. High mileage oil. I need help please. Thanks, Jason M
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Old 10-15-2013, 07:23 AM
TransEngineer TransEngineer is offline
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On a 2005 Ram with 5.7L, you should have a 545RFE (5-speed, with overdrive) transmission. So you should have an overdrive gear (actually, two of them; 3rd gear is direct drive, 4th is a 0.75:1 overdrive, 5th is a 0.667:1 overdrive).

The trans shifting is controlled by a balance between throttle opening and output speed. You should have a dealer or shop check to see whether your throttle angle is reading correctly. Any CEL or fault codes?

If your trans is not shifting into overdrive (or not engaging the Torque Converter Clutch [TCC]), that would definitely affect your fuel economy.
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Old 10-15-2013, 09:12 AM
jaywmiller1972 jaywmiller1972 is offline
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Thanks so much for your reply! I only have a minute and I am off to work..

The tranny is just an ST model, three speed I believe. I will check into it. The gear shifter reads, l, 2, d, n, r, p. With a tow haul button. I guess I have to take it to a bigger town where there is somebody that knows what the heck they are looking at. Any way, I will back hjere later this afternoon. Thank every one for being so kind. Till then..
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