2H - 2-wheel drive / high range
3.slow - Usually referes to the lethargic 3.0L (3VZ) engine found in Toyota models from 1988-1995.
4H - 4-wheel drive / high range
4L - 4-wheel drive / low range
A/T - All-Terrain; often used when referring to tires, a tire that is more apt to off-road conditions however less aggressive than a mud-terrain tire
AAL - Add-a-Leaf
ABS - Anti-lock brake system
ADD - Automatic Disconnecting Differential System; disconnects the front axles and hub assemblies from the drive shaft at the differential when the vehicle is in 2-wheel drive mode, eliminating the need to disconnect them manually. It also engages the front axles to the differential when 4-wheel drive is selected
Air Down - Partially deflating tires to improve traction
Air Locker - Pneumatically-activated differential locker
ARB - Manufacturer of high-quality aftermarket 4x4 accessories, including their patented air locking differential as well as armor for all areas of your 4x4
ATF - Automatic Transmission Fluid
AT-PZEV - Advanced Technology Partial Zero Emission Vehicle; vehicles that produce extremely low levels of hydrocarbons and oxides of nitrogen
A-TRAC - Active Traction Control; incorporates sensors at all four wheels to monitor a loss of traction, Active TRAC employs brake and throttle control to reduce wheel spin and transfer torque to the wheel with the most traction.
Auto LSD - Automatic Limited-Slip Differential; differential that automatically distributes power to the wheel that has traction, this type of differential is preferred in slippery conditions (snow, ice, gravel, etc...)
BFG - B.F. Goodrich Tires
CAI - Cold Air Intake
CARB - California Air Resources Board
Cat - Catalytic converter; exhaust device installed before the muffler to reduce emissions (Cali-spec models have dual cat's)
Cat-Back - Exhaust system after the catalytic converter
CEL - Check Engine Light
CHMSL - Center High-Mount Stop Lamp
COG - Center of Gravity
CRS - Child Restraint System
CV - Constant Velocity
CVT - Continuously Variable Transmission; transmission design which allows the driveshaft to maintaint a constant velocity over a range of output velocities. Can provide better fuel economy than other transmissions by enabling the engine to run at its most efficient RPM for a range of vehicle of speeds.
DAC - Downhill Assist Control; system that automatically applies the brakes during a downhill descent without locking the wheels
DOHC - Double Overhead Cam
DOT - Department of Transportation
DRL - Daytime Running Lights
ECM - Electronic Control Module
ECT - Electronically Controlled Transmission; automatic transmissions only
ECT-i - Electronically Controlled Transmission with Intelligence; automatic transmissions only
ECU - Electronic Control Unit
EFI - Electronic Fuel Injection
EGR - Exhaust Gas Recirculation
E-Locker - Electronic Locking Differential
FJC - FJ Cruiser (2006+)
Fob - Key ring remove device; door locks, remote start, etc…
FSM - Factory Service Manual; repair manuals written by Toyota and used by all Certified Toyota Technicians
GAWRF - Gross axle weight rating front axle; the max weight the front axle is designed to carry
GAWRR - Gross axle weight rating rear axle; the max weight the rear axle is designed to carry
GPS - Global Positioning Satellite
GVWR - Gross Vehicle Weight Rating; maximum combined weight rating including the vehicle and its equipment, fluids, occupants and cargo.
HAC - Hill-Start Assist Control; automatically increases brake pressure to all four wheels to reduce rolling backwards while accelerating uphill.
HID - High Intensity Discharge; extremely bright, often blue in color, low-wattage lights
IFS - Independent Front Suspension
KYB - KYB America, LLC; Tokyo-based shock/strut manufacturer.
LCA - Lower Control Arm
LCD - Liquid Crystal Display
LED - Light-Emitting Diode
LEV - Low Emission Vehicle
Live axle - Straight axle (non-IFS)
Locker - Device put in differentials to lock gears together providing exceptional off-road traction.
Locking Hubs - Engage-able free-spinning front hubs (i.e. Aisin manual hubs); preferred due to the ability to reduce wear on components when 4-wheel drive is not engaged.
LSD - Limited Slip Differential; type of differential that improves traction by splitting torque evenly and preventing one wheel from slipping or spinning, this type of differential is preferred in slippery conditions (snow, ice, gravel, etc...)
LSPBV - Load-Sensing Proportioning and Bypass Valve; mounted to the frame and the rear axle, the LSP & BV senses the weight distribution of the vehicle and automatically varies the amount of hydraulic pressure to the rear brakes based on the load in the vehicle, this helps to reduce rear-wheel lock-up with either light or heavy loads to maintain stopping control.
M/T - Mud-Terrain; often used when referring to tires, a tire that is made specifically for off-road conditions
MAF - Mass Air-Flow Sensor
OBA - On-Board Air
OBD/OBD II - On-Board Diagnostics
OEM - Original Equipment Manufacturer
OHV - Off-Highway Vehicle
OME - Old Man Emu; Australian-made suspension components manufactured by ARB, USA
PCM - Powertrain Control Module
PCV - Positive Crankcase Ventilation
R&P - Ring and Pinion; differential gears
RR Diff Lock - Rear Differential Lock
RSCA - Roll-sensing Side Curtain Airbag
SAC - Solid Axle Conversion
SAS - Solid Axle Swap
SAW - Sway A Way
SFA - Solid Front Axle
SOA - Spring Over Axle
SOHC - Single Overhead Cam
SRS - Supplemental Restraint System; airbags inflated with nitrogen gas that deploy within a fraction of a second
SST - Special Service Tool; usually refers to a Toyota specific tool or diagnostic device.
SULEV - Super Ultra Low Emission Vehicle
T4R - Acronym for Toyota 4Runner
TB - Timing Belt or Throttle Body depending on context
TPMS - Tire Pressure Monitoring System; alerts the driver by illuminating an indicator on the dash when tire pressure reaches a critically low level
TRAC - Traction control; helps to avoid slippage of the driving wheels by slightly applying the brake on a slipping drive wheel and reducing the throttle to maintain traction according to the road surface conditions.
TRD - Toyota Racing Development
TSB - Toyota Service Bulletin
UCA - Upper Control Arm
ULEV II - Ultra Low Emission Vehicle II
Unibody - The floor pan of a vehicle and chassis are connected to form a single structure; there is no separate frame. By welding all body panels together to form the vehicle's frame, it is possible to build in strength and rigidity with less weight.
URD - Underdog Racing Development; manufacturer/distributor for various aftermarket performance parts including the TRD Superchargers
VSC - Vehicle Stability Control
VVT-i – Variable Valve Timing with Intelligence; varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position.
WOT - Wide-Open Throttle
Y-pipe - Pipe used to split/bypass the exhaust

AFAIK - As far as I know
BFH - Big f****** hammer
BTT - Bring to top
BTW - By the way
BUMP - Posting to bring an old thread back to the top
DD - Daily driver
DIY - Do-it-yourself
FORD - Fix or repair daily / Failure of research & development / Found on roadside dead
FS - For sale
FTW - For the win
FUBAR - F**** up beyond all recognition
FWIW - For what it's worth
FYI - For your information
HTH - Hope this helps/helped
IIRC - If I remember correctly
IMHO - In my humble/honest opinion
IMO - In my opinion
LMAO - Laughing my ass off
LOL - Laugh out loud
NIB - New in box
PITA - Pain in the ass
POS - Piece of s***
ROFL - Rolling on the floor laughing
RTFM - Read the f****** manual
TIA - Thanks in advance
TTT - To the top
WTB - Want to buy...
WTF - What the f***?
WTH - What the hell?
WTS - Want to sell...
WTT - Want to trade...

20R
2-valve SOHC 2.2L (2189cc) produced from 1975 to 1980
Output was 96hp at 4800rpm and 120ft•lbf at 2800rpm.

Applications:
1975-1980 Toyota Hilux
1975-1980 Toyota Celica U.S. Version
1975-1980 Toyota Corona U.S. Version


21R
2-valve SOHC 2.0L (1972cc) produced from 1978 to 1987.
Cylinder bore was 84mm (3.31 in) and stroke was 89mm (3.5 in).
Output was 105hp at 5200rpm and 116ft•lbf at 3600rpm.


21R-C (California)
2-valve SOHC 2.0L (1972cc) produced from 1982 to 1985.
Cylinder bore was 84mm (3.31 in) and stroke was 89mm (3.5 in).
Output was 90hp at 5000rpm and 116ft-lbf at 3600rpm.


21R-U (Japanese)
2-valve SOHC 2.0L (1972cc) produced from 1982 to 1985.
Cylinder bore was 84mm (3.31 in) and stroke was 89mm (3.5 in).
Output was 105hp at 5200rpm and 120ft•lbf at 3600rpm.


22R
The 2-valve SOHC 2.4L (2366cc) produced from 1981 to 1995.
Cylinder bore was 91.9mm (3.62 in) and stroke was 88.9mm (3.5 in).
Initial output was 97hp at 4800rpm and 129ft•lbf at 2800rpm.
By 1990 the 22R was producing 108hp at 5000rpm and 138ft•lbf at 3400rpm.

Applications:
1981 Toyota Corona
1981-1988 Toyota Hilux
1981-1984 Toyota Celica
1981-1995 Toyota Pickup
1984 Toyota 4Runner


22R-E
The 2-valve SOHC 2.4L (2366cc) produced from 1983 to 1995.
Cylinder bore was 91.9mm (3.62 in) and stroke was 88.9mm (3.5 in).
Output of these engines is commonly rated at 105hp at 4800rpm and 137ft•lbf at 2800rpm.
In 1985, the engine was significantly reworked, output was up to 112hp at 4600rpm and 142ft•lbf at 3400rpm.
Many parts from the newer 22R-E are not compatible with those from the older pre-1985 engine.
Non-compatible parts include the cylinder head, block, pistons and many of the associated parts such as the timing chain and cover, and water and oil pumps (although the oil pump internals are the same).

Applications:
1985-1995 Toyota Hilux
1983-1985 Toyota Celica
1985-1995 Toyota Pickup
1985-1995 Toyota 4Runner


22R-TE
2-valve SOHC 2.4L (2366cc) produced from late-1985 to 1988.
Cylinder bore was 91.9mm (3.62 in) and stroke was 88.9mm (3.5 in).
Output was 135hp at 4800 rpm and 173ft•lbf at 2800rpm.

Applications:
1985-1988 Toyota Hilux
1987 Toyota 4Runner


3VZ-E
3.0L (2958cc) produced from 1988 to 1995.
Cylinder bore was 87.5mm (3.4in) and stroke was 82.0mm (3.2in).
At introduction output was specified as 145hp then later bumped to 150hp at 4800rpm with 180ft•lbf of torque at 3400rpm.
Despite sharing an engine family designation the 3VZ-E and 3VZ-FE have few parts in common.

Applications:
1988-1995 Toyota 4Runner
1988-1995 Toyota Pickup
1993-1995 Toyota T100


3VZ-FE
3.0L (2958cc) produced from 1992 to 1997.5.

Applications:
1992-1997 Toyota Camry


5VZ-FE
3.4L (3378cc) produced from 1995.5 to 2004.
Cylinder bore was up to 93.5mm (3.7in) and stroke was 82.0mm (3.2in).
Output is 201hp at 4800rpm with 220ft•lbf of torque at 3600rpm.
Cast iron engine block, aluminum DOHC cylinder heads, uses MFI fuel injection, has 4 valves per cylinder with bucket tappets and features large cast connecting rods, a one-piece cast camshaft, and a cast aluminum intake manifold.

Applications:
Toyota Tacoma
Toyota Tundra
Toyota T-100
Toyota 4Runner
Toyota Land Cruiser Prado
Toyota Granvia


1GR-FE
4.0L (3955cc) produced from 2003 to present.
Bore is 94mm and stroke is 95mm.
Output is 236hp at 5200rpm with 266lb•ft of torque at 4000rpm on 87 octane, and 239hp at 5200rpm with 278lb•ft at 3700rpm on 91 octane.
Features Toyota's VVT-i technology.

Applications:
2006 - present Toyota FJ Cruiser
2005 - present Toyota Tacoma
2003 Toyota 4Runner/Hilux Surf
2007 Toyota Land Cruiser 200
2003 Toyota Land Cruiser Prado
2005 Toyota Hilux
2005 Toyota Tundra
2007 Toyota Tundra
2005 Toyota Fortuner