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131 Posts
i have an 04 dakota with the 4.7 and the 545rfe w/ 3.55 open rear end. i live in the heart of the applachian mountains therefore i don't do a lot of long flat highway running.
My issue is that i don't have enough power once i get into fifth gear with lock up. it drags ass going uphills until it drops substantially until it gets to the shift point, then it shifts to 3rd and pulls hard until it gets up to correct speed.
i have read about people going and updating their 45rfe to the 545rfe because they get the second overdrive. I want to remove my second overdrive and go back to the final transmission ratio of .75 like a 45rfe.
i was contemplating a rear end gear updgrade but with a 4x4 you are talking $$$. i thought if i could just get it flashed with the old programming, possibly i can get my rpms into the right range w/o doing a major gearing overhaul.
sorry for the long post, anyone have any insight?
My issue is that i don't have enough power once i get into fifth gear with lock up. it drags ass going uphills until it drops substantially until it gets to the shift point, then it shifts to 3rd and pulls hard until it gets up to correct speed.
i have read about people going and updating their 45rfe to the 545rfe because they get the second overdrive. I want to remove my second overdrive and go back to the final transmission ratio of .75 like a 45rfe.
i was contemplating a rear end gear updgrade but with a 4x4 you are talking $$$. i thought if i could just get it flashed with the old programming, possibly i can get my rpms into the right range w/o doing a major gearing overhaul.
sorry for the long post, anyone have any insight?