Thread: No No ECO
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Old 09-21-2011, 06:05 PM
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GTyankee GTyankee is offline
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I believe some members are confused about a couple things

the Transmission has Nothing to do with the MDS, but it does ALLOW MDS to work
MDS is a ENGINE function of the 1500 models with the 5.7 Hemi
the 5.7 engines in the 2500 & 3500 series do not have ANY MDS
MDS is a function of the engine, MDS is a 4 cylinder engine function, so your are only using 1/2 the engine
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the 545RFE & the 65RFE transmissions has gears, the 65rfe uses one of the 2nd gears differently
First gear
Second low gear
Second high gear
third gear
fourth gear
FIFTH gear
Fifth gear with Torque Converter Lockup
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( a brief explanation of TCL also known as TCC, written by a transmission technician,
I wanted to briefly mention what the term lock-up means. Lock up is a feature introduced in about 1982 with the advent of the T-700R4 and T-200-C General motors transmissions. Simply put, since a torque converter is a fluid coupler it will always have a certain amount of ‘slip’ built into it. It is unavoidable due to fluid being the main component of the coupling action. This decreases gas mileage by 1-4 miles per gallon, the built in slippage, that is.

To eliminate the problem, an actual clutch disc has been built right into the torque converter. At a certain speed, usually about 45-50 mph a message from a computer sends a forceful ‘charge‘ of automatic transmission fluid to the converter, which applies the clutch plate inside and eliminates the small amount of built in ‘slippage’.

Darn good idea. A lot of updates and improvements have been developed over the years which has just about perfected the design)

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When you are in 5th gear with the torque converter locked, basically OVER DRIVE,
a signal is sent to the electronic controller that allows the MDS on the engine to function, but only IF certain conditions are present, like driving on flatter surfaces at a steady rate of speed, MDS kicks out if you climb a hill because your Engine has to work harder, it needs ALL 8 cylinders. The transmission still stays in 5th with the converter locked up, unless it has to shift down & then the converter becomes unlocked & it goes into a more proper gear

I hope that this clears things up just a little bit, i didn't understand it for a long time
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Ram 1500 SLT Quad cab, 5.7 HEMI(R) MDS VCT, 5 speed auto 545RFE, 3.55 differential gears, 18" Magnaflow muffler, EGR bug deflector, Bushwacker fender flares, customized Nfab nerf bars, CB radio, Autonet wi-fi router, custom soft tonneau cover, Line_X bedliner, DEBO Step, build date 10/15/08 a Wednesday built vehicle

Last edited by GTyankee; 09-21-2011 at 06:12 PM.
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