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Car Forum / Dodge / Dodge Trucks / July 2005tow/haul '05 cummins
today was the first day that i towed heavy with my '05 big horn (i definately bought the right truck!). when i switched into tow/haul mode it stayed in drive a little longer, but it still shifted into overdrive. is this normal, or is tow/haul just a setting to keep the torque converter unlocked or something? thanks,  SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com > stayed in drive a little longer, but it still shifted into overdrive. is > this normal, or is tow/haul just a setting to keep the torque converter > unlocked or something? Normal. In '05, the tow/haul mode changes the way the transmission shifts (keeps the T/C locked longer, extends gear ranges, and will downshift to assist in braking), but O/D is not locked out. With the 48RE, it's not a concern. > Normal. sweet, it caught me by surprise when it shifted into overdrive. > In '05, what about the '04.5? > the tow/haul mode changes the way the transmission shifts (keeps the T/C > locked longer, extends gear ranges, and will downshift to assist in > braking), but O/D is not locked out. i also noticed the downshifting. good job dodge! SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com > what about the '04.5? In '04.5, (and '04 as well, I believe), they simply renamed "O/D OFF" to "TOW/HAUL", because less-than-informed buyers would say, "well, the other maker has a tow/haul thingy on their transmission - do you?" > i also noticed the downshifting. good job dodge! It took them damn-near forever, but I'm fairly certain the '05s can accept an ECM flash to allow approved, warranty-covered use of an exhaust brake. That might be something you want to look into if you plan on pulling heavy through the mountains. >> what about the '04.5? > > In '04.5, (and '04 as well, I believe), they simply renamed "O/D OFF" to > "TOW/HAUL" pretty much what i thought. what would it take to make an '04.5 perform like the '05? a controller swap? a flash? > It took them damn-near forever, but I'm fairly certain the '05s can accept > an ECM flash to allow approved, warranty-covered use of an exhaust brake. > That might be something you want to look into if you plan on pulling heavy > through the mountains. what do those typically sell for? initially i really wanted an exhaust brake but since playing with my prodigy im confident in its efficient and effective braking. if its not ridiculous id probably add an exhaust brake but if its ridiculous ill rely on my prodigy. SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com > pretty much what i thought. what would it take to make an '04.5 perform > like the '05? a controller swap? a flash? A BFH and a blowtorch :) > what do those typically sell for? Around a grand... > Around a grand... thats not to bad, certainly not what i expected. ive seen the literature on the jacobs brand. any others? SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com > thats not to bad, certainly not what i expected. ive seen the literature > on the jacobs brand. any others? That's the only one that's warranty-approved (for whatever that's worth), but I've always ben partial to PacBrake. The big downer for me about the Jacobs is that it uses a vacuum pump to activate it. While that in itself isn't a big issue, the fact that the vacuum pump mounts in the accessory drive, and therefore requires a special, longer serpentine belt, could make emergency replacement an issue. The solution here is to get two belts at the time of install, and keep one under the seat. BD Power and Banks are also popular choices for exhaust brakes. the PCM boosts line pressure in 'tow' since line pressure is up, it takes more governor pressure to move the shift valves so shifts are firmer and delayed a bit converter should lock in OD or in 3rd if OD is cancelled, in 'tow' mode G > today was the first day that i towed heavy with my '05 big horn (i > definately bought the right truck!). when i switched into tow/haul mode it > stayed in drive a little longer, but it still shifted into overdrive. is > this normal, or is tow/haul just a setting to keep the torque converter > unlocked or something? > thanks, > the PCM boosts line pressure in 'tow' what would it take to make the '04.5 perform like the '05? SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com someone at Mopar to get off their a.s, figure out the 'new' strategy, then get EPA approval for the programming never happen > > the PCM boosts line pressure in 'tow' > > what would it take to make the '04.5 perform like the '05? > someone at Mopar to get off their a.s, figure out the 'new' strategy, then > get EPA approval for the programming > > never happen if the '04.5 48RE and the '05 48RE are mechanically the same, what parts would i need to buy to make them perform the same? specifically what makes the '05 act differently than the '04.5? SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com the ECM programming, most likely valve body's are identical > > someone at Mopar to get off their a.s, figure out the 'new' strategy, then > > get EPA approval for the programming [quoted text clipped - 4 lines] > would i need to buy to make them perform the same? specifically what makes > the '05 act differently than the '04.5? > the ECM programming, most likely sweet. is this something i could get reprogrammed at a tranny shop or is this a dealer only issue? SignatureNathan W. Collier http://InlineDiesel.com http://7SlotGrille.com http://UtilityOffRoad.com any 'flash' of the OEM system has to come from Mopar > > the ECM programming, most likely > > sweet. is this something i could get reprogrammed at a tranny shop or is > this a dealer only issue? >> someone at Mopar to get off their a.s, figure out the 'new' strategy, then >> get EPA approval for the programming [quoted text clipped - 4 lines] >would i need to buy to make them perform the same? specifically what makes >the '05 act differently than the '04.5? if you are talking about an exhaust brake, the '04.5 will not be approved by dc for one. the '06 auto is approved for one. the '05 will be but it will take a while, probably some time next year. the software for the '05 has to be written for the ecm and dc is simply in no hurry to do that. the ecm in the '04.5 is not large enough for the software and likely can not be changed out, it is a whole different cat. that doesn't mean that you can't put an exhaust brake on an '04.5, you just void your warranty if you do. |
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