Welcome aboard
Bussey,
Welcome to TDR. You have plenty of reading ahead of you. Here are some of the abbriviations.
A big thank you goes to Dave Fritz (dodgeram.com) for compiling the following list:
2WD - Two Wheel Drive
4WD - Four Wheel Drive
ABS - Anti-lock Brake System: Modulates braking pressure to control wheel lockup
ACM - Airbag Controller Module: monitors sensors and deploys airbag(s) in the event of an accident
AFC - Air Fuel Control: used on 94 - 98 diesels to control fuel rate at low boost
APPS - Accelerator Pedal Position Sensor: used on ISB diesel for electronic throttle control
ASD - Auto Shut Down: relay control system used to shut down engine
BDC - Bottom dead center - the lowest position of a piston in the cylinder occurs when the crank pin is at bottom dead center
BE - model designation for the Quad Cab Ram pickup
BFSC - Brake Specific Fuel Consumption - pounds of diesel fuel consumed to produce 1 HP for 1 hour
BHAF - Big Honkin' Air Filter - oversized filter used by the diesel gang
BR - model designation for standard cab Ram pickup (and maybe the CC Pickup) more below
CAB - Controller Anti-lock Brake
CARB - California Air Rescouces Board: environmental regulatory agency in CA
CCD - Chrysler Collision Detection: data bus system used by the airbag and the anti-lock brake systems
CHMSL - Center High Mounted Stop Light: 3rd brake light at top of truck cab
CKP - Crank Position Sensor: detects position and speed of engine crankshaft
CMP - Camshaft position sensor: detects position of camshaft
CPL - Control Part List: listing of engine parts and timing specifications for a Cummins engine (Ram CPL numbers) CTD - Cummins turbo diesel - used by many on mail lists and message boards
CTM - Central Timer Module: controls RKE, chime, courtesy lamps, Speed sensitive Intermittent wipers, enhanced accident response, VTSS
DAB - Driver Air Bag module: airbag and firing system mounted in the steering wheel center
DC or D/C - DaimlerChrysler - used on mail lists and message boards
DD1 DD1, DD2, DD3 - Diesel Dynamics Stage 1 (2 or 3) injectors
DEE - Order code for the NV5600 6 speed manual transmission
DLC - Data Link Connector: used to interface diagnostic equipment with vehicle electronics
DRB - scan tool used to obtain diagnostic trouble codes (DTC) from controller modules
DRB III - new generation scan tool used to obtain diagnostic trouble codes (DTC)
DTC - Diagnostic Trouble Code: Fault code set by control module when sensor data is not as expected
DTT - Diesel Transmission Technologies - aftermarket auto trans upgrade specialist
EBC 2 - RWAL brake system
EBC 325 - four wheel anti-lock brake system
ECM - Engine Control Module: microprocessor based module that controls various engine functions
ECT - Engine Coolant Temperature Sensor
EEPROM - Electrically Erasable Programmable Read Only Memory: controller reprogrammable memory
EGR - Exhaust Gas Recirculation: used to reduce combustion temperature and pressure to control Oxides of Nitrogen emissions
EGT - Exhaust Gas Temperature: Important measurement for hard working diesel engines
EMCC - Electronically Modulated Converter Clutch: used for torque converter lockup control in the automatic transmission
ETC - Order code for diesel engine
ETH 2001 - Order code for the High Output diesel engine
ETH/DEE - Slang for the 2001 HO diesel with the NV5600 six speed
EVA - Electronic Vibration Analyzer - used to diagnose chassis, engine, and drivetrain vibrations
EVR - Electronic Voltage Regulator: circuitry in the PCM which controls battery charging and alternator functions
FPCM - Fuel injection Pump Control Module: controls injection pump on 98+ diesel engines
GAWR - Gross Axle Weight Rating: maximum safe load capacity of an axle measured at the ground.
GCW - Gross Combined Weight: total weight of equipped truck, payload, trailer, water, and equipment.
GCWR - Gross Combined Weight Rating: maximum allowable GCW
GVW - Gross Vehicle Weight: total curb weight of the truck and payload.
GVWR - Gross Vehicle Weight Rating: maximum allowable GVW
HCU - Hydraulic Control Unit: modulates the brake pressure for ABS
HX35 - Holset turbocharger used for most 94+ diesel Rams.
HX40 - Holset turbocharger intended for C engines, but used by some performance enthusiasts on the Ram's B engine
HY35 - Holset turbocharger used on 2000+ diesel Rams with the automatic transmission
IAT - Intake Air Temperature Sensor
IAC - Idle Air Control valve: used for emissions control on gasoline engines
IP - Instrument Panel
ISB - Interact System B: Cummins designation for the 24 Valve "B" series diesel introduced to the 1998 Ram
JTEC - Jeep, Truck Engine Control: Combined engine and transmission control module
K&N - Aftermarket filter and intake system manufacturer
KDP - Killer dowel pin inside the timing gear case on 94-98 12 valve diesels. If this pin falls out of its blind hole, the repair is expensive. The two preventative repairs are the Washer Tab and Drill Jig/Bolt
LDP - Leak Detection Pump: used in the 4 wheel ABS valve assembly
LED - Light Emitting Diode: semiconductor lamp used for displays and warning lamps
LSD - limited slip differential
LWB - long wheelbase (or LB, for long box or long bed)
MAP - Maximum Absolute Pressure sensor: used for emission control
MDS(2) - Mopar Diagnostic System: diagnostic computer system for service departments
MIC - Mechanical Instrument Cluster: Instrument cluster controller and display system
MIL - Malfunction Indicator Light: used by engine control system to indicate a problem to the driver
MTV - Manifold Tuning Valve: used to vary the manifold runners for engine performance and emission control
O2S - Oxygen Sensor: measures oxygen content of exhaust stream. Used to modify air to fuel ratio for emission control
OBD - On Board Diagnostics: Ram engine and powertrain self diagnostic system
OBD II - On Board Diagnostics II: enhanced diagnostic system to meet 1997 EPA requirements
P7100 - Fuel injection pump used with 1994 - 1998 Ram 12 valve diesel engines
PAB - Passenger Air Bag module: airbag and firing mechanism on the passenger side
PADS - Passenger Airbag Disarm Switch: Override switch to disable
PAB - when children are riding in front seat
PCI - Programmable Communications Interface
PCM - Powertrain Control Module: microprocessor based module that controls engine and drivetrain functions
PCV - Positive Crankcase Ventilation: vacuum system used to control crankcase (blowby) emissions
PDC - Power Distribution Center: Fuse and relay power distribution center located under the hood.
PEP - Peripheral Expansion Port psi Pounds per Square Inch: pressure measurement
RAM - Random Access Memory: read and write memory used by controllers for data storage
RKE - Remote Keyless Entry: remote operated door lock system
RPM - Revolutions Per Minute: the speed of a turning shaft or rotor
ROM - Read Only Memory: controller "hard" memory that is permanently written - EEPROM may be reprogrammed with appropriate diagnostic tools
RWAL - Rear Wheel Anti Lock brakes
SBEC - Single Board Engine Controller
SCI - Serial Communications Interface: Used by the PCM for diagnostics and for communication with other controller modules
SCTM - Seatbelt Timer Control Module: inertia latching seatbelt controller built into Quad Cab Models
SKIM - Sentry Key Imobilizer Module: disables engine start until Secret Key is entered using DRB scan tool !!! Required when a new PCM is installed in a vehicle
SWB or SB - for short box or short bed
TCC - Torque Converter Clutch
TCM - Transmission Control Module: May not be used on Ram trucks
TDC - Top Dead Center: the highest position of a piston in the cylinder occurs when the crank pin is at top dead center
TDR - Turbo Diesel Register - club for Ram diesel owners - with a website, magazine, and rallys
TPS - Throttle Position Sensor
TRS - Transmission Range Sensor
TSB - Technical Service Bulletin: repair and technical information bulletins to assist service departments
TST - Diesel engine power enhancement company run by Mark Chapple
VB - Valve body - auto trans
VE - Bosch Distributor type injection pump used on 89-93 Ram diesel engines
VP44 - Bosch electronic fuel injection pump used on 1998+ Ram diesel engines
VIN - Vehicle Identification Number: unique serial number assigned to each vehicle
VSS - Vehicle Speed Sensor/Signal
VTSS - Vehicle Theft Security System: anti theft system with engine disable, alarm, and door lock features
WIF - Water In Fuel sensor: detection system for water in fuel filter on 1994+ diesel engines
WOT - Wide Open Throttle: maximum throttle position
Attention: TDR Forum Junkies 
just kidding
