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Old 07-21-2015, 09:23 AM   #31
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OK, I'm totally new to this so I have few opinions but always curious as to how others handle things.

I have one of the older units (2004 Dodge Ram 3500 Quad Cab, 4X4, 5.9L Cummins HO, auto trans (48RE)). The trans has been completely redone with BD triple disc billet torque converter, new valve body and oversize oil pan. From what I can gather the tow/haul mode in my truck is not really linked to particular sensors but is basically a manual lockout of overdrive. So, in essence, not really a "smart" tow/haul mode.

Would manual shifting make sense with this one or is it still recommended to let the tranny do it's thing?
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Old 07-21-2015, 11:28 PM   #32
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OK, I'm totally new to this so I have few opinions but always curious as to how others handle things.

I have one of the older units (2004 Dodge Ram 3500 Quad Cab, 4X4, 5.9L Cummins HO, auto trans (48RE)). The trans has been completely redone with BD triple disc billet torque converter, new valve body and oversize oil pan. From what I can gather the tow/haul mode in my truck is not really linked to particular sensors but is basically a manual lockout of overdrive. So, in essence, not really a "smart" tow/haul mode.

Would manual shifting make sense with this one or is it still recommended to let the tranny do it's thing?
I have a similar tow beast...2005 Dodge Ram 2500 Quad cab w/ 5.9 Cummins with a built 48RE and Smarty S06-PoD. I am towing pretty heavy. When ready to go camping I am at 19.5K combined.

The 48RE is just the old 727 Torqueflite with an OD unit bolted to the back. So technology wise it s pretty old. I have learned that it can be built relatively inexpensively (when compared to other transmissions) to withstand more than I can ever imagine.

The shop that built my transmission advised just that. Do not lug the engine. Third gear can handle way more torque than the OD unit. Higher engine RPM will also make more line pressure to prevent slipping of the clutches.
Since 2005 was a weird year that Dodge did not give you the ability to lock out OD (just tow/haul mode for 2005. 006 had both) I had to add a BD OD lock out kit to give me that function. Higher RPM when climbing a grade = lower EGT as well.
I will typically lock out OD until I am going faster than 55-ish. I have found the need a few times to manually downshift to second in traffic but generally do not.

If you do not have gauges for EGT and transmission temp I would suggest that you get them. I use the info from them to adjust my driving style accordingly
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Old 07-22-2015, 01:51 AM   #33
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I only manually shift in my Vette, I let the diesel do the talking.
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Old 07-22-2015, 09:47 AM   #34
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Originally Posted by mikemc53 View Post
OK, I'm totally new to this so I have few opinions but always curious as to how others handle things.

I have one of the older units (2004 Dodge Ram 3500 Quad Cab, 4X4, 5.9L Cummins HO, auto trans (48RE)). The trans has been completely redone with BD triple disc billet torque converter, new valve body and oversize oil pan. From what I can gather the tow/haul mode in my truck is not really linked to particular sensors but is basically a manual lockout of overdrive. So, in essence, not really a "smart" tow/haul mode.

Would manual shifting make sense with this one or is it still recommended to let the tranny do it's thing?
I believe that most Ram owners (Dodge no longer builds pick-up trucks) who have the 68RFE are the ones discussing the shifting technique at least on RAM’S. The reason is there are two overdrive gears in the transmission; 5th gear (0.82:1) is a single OD and 6th gear (0.63:1) is a double OD gear ratio. Truck will lug if in 5th and 6th gears in town.

With my truck and the 3:73 differential gear set with the LT285/70R 17 tires; at 30 MPH the engine RPM’s are around 1200 if I am in 5th gear. The engine seems to be lugging to me which is not good for a diesel. I toggle the switch to 4th gear locking out 5th and 6th gears the engine RPM’s are above 1500. The truck will still shift like it normally would but will not be able to shift to 5th and 6th gears. These are electronically locked out; tow/haul is not effected at all shift points are still changed when tow/haul is engaged.
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Old 07-22-2015, 11:55 AM   #35
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Jim34RL, that's interesting. So if I use the +/- and set it to 4th gear, it will still be just like the norm except lock out 5th and 6th? Being fairly new to all this I'm learning a lot! Thanx!
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Old 07-22-2015, 12:24 PM   #36
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Originally Posted by Jim34RL View Post
I believe that most Ram owners (Dodge no longer builds pick-up trucks) who have the 68RFE are the ones discussing the shifting technique at least on RAMíS. The reason is there are two overdrive gears in the transmission; 5th gear (0.82:1) is a single OD and 6th gear (0.63:1) is a double OD gear ratio. Truck will lug if in 5th and 6th gears in town.

With my truck and the 3:73 differential gear set with the LT285/70R 17 tires; at 30 MPH the engine RPMís are around 1200 if I am in 5th gear. The engine seems to be lugging to me which is not good for a diesel. I toggle the switch to 4th gear locking out 5th and 6th gears the engine RPMís are above 1500. The truck will still shift like it normally would but will not be able to shift to 5th and 6th gears. These are electronically locked out; tow/haul is not effected at all shift points are still changed when tow/haul is engaged.
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Old 07-22-2015, 12:55 PM   #37
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Jim34RL, that's interesting. So if I use the +/- and set it to 4th gear, it will still be just like the norm except lock out 5th and 6th? Being fairly new to all this I'm learning a lot! Thanx!
Yes that is correct. Now I would also run the exhaust brake 100% of the time. The only time not to use is when the road surface is slick say snow covered or ice covered. The reason is this keeps the turbo from sooting up and allows the slider ring to function correctly over time.

I could give you more but I am trying to keep this simple.

For more information go to Turbo Diesel Register. Com, the best site on the web for the Ram Cummins truck owner to learn about the truck. We are not a group of kids who are trying to hot rod the truck. We cover the first gen all the way thru the 4 gen trucks and the 1500 Eco diesel too. I have been a member since Nov 2007 will worth the $35.000 yearly membership fee.
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Old 07-22-2015, 01:01 PM   #38
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Kinda spendy, but.....
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Old 07-22-2015, 03:16 PM   #39
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Thanx for the info Jim, I'm going to check that out!
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