Just thought that I should post this list of all the unlock dates for different features of the game in case you wanted to build a car with specific features.
MODEL DESIGNER
CHASSIS TYPE
1940 - Ladder
1955 - Monocoque
MATERIAL
1940 - Steel
1940 - Galvanised Steel
1980 - Corrosion Resistant Steel
1987 - Carbon Fibre
1990 - Glued Aluminium
2000 - AHS Steel
ENGINE PLACEMENT
1940 - Front Longitudinal
1965 - Front Transverse
FRONT SUSPENSION
1940 - Macpherson Strut
1940 - Double Wishbone
REAR SUSPENSION
1940 - Solid Axle Coil
1940 - Solid Axle Leaf
1940 - Semi Trailing Arm
1940 - Double Wishbone
1965 - Torsion Beam
1980 - MultiLink
PANEL MATERIAL
1940 - Steel
1940 - Hand Made Aluminium
1960 - Fibre Glass
1980 - Corrosion Resistant Steel
1985 - Polymer
1990 - Carbon Fibre
2005 - Aluminium
DRIVETRAIN
1940 - Longitudinal RWD
1965 - Transverse FWD
1985 - Longitudinal AWD
1990 - Transverse AWD
ENGINE DESIGNER
BLOCK MATERIAL
1940 - Cast Iron
1970 - Aluminium
1995 - ALSI
2010 - Magnesium
HEAD TYPE
1940 - Push Rod
1940 - Direct Acting OHC
1940 - SOHC
1940 - DOHC
1995 - Modern OHV
HEAD MATERIAL
1940 - Cast Iron
1970 - Aluminium
1995 - ALSI
VVT
1940 - None
1992 - VVL
CRANK
1940 - Cast Iron
1955 - Forged
1985 - Billet Steel
CONRODS
1940 - Cast
1940 - Heavy Duty Cast
1955 - Forged H Beam
1965 - I Beam Steel
1995 - I Beam Titanium
PISTONS
1940 - Cast
1940 - Heavy Duty Cast
1955 - Forged
1970 - Hypereutectic Cast
1990 - Low Friction Cast
1990 - Lightweight Forged
VVT
1940 - None
1992 - VVT
ASPIRATION
1940 - Naturally Aspirated
1975 - Turbocharged
FUEL SYSTEM
1940 - Single Barrel Carburetor
1948 - 2 Barrel Carburetor
1955 - 4 Barrel Carburetor
1965 - DCOE
1968 - Mechanical Injection
1988 - Single Point EFI
1992 - Multi Point EFI
2003 - Direct Injection
FUEL TYPE
1940 - Regular Leaded
1940 - Super Leaded
1960 - Low Quality
1970 - Regular
1985 - Premium
1990 - Super
1995 - Ultimate
MUFFLER BYPASS
1940 - None
2000 - Bypass Valves
CATALYTIC CONVERTER
1940 - None
1975 - Two Way
1981 - Three Way
1990 - High Flow Three Way
MUFFLER
1940 - None
1940 - Baffled
1950 - Reverse Flow
1968 - Straight Through
TRIM DESIGNER
GEARBOX
1940 - 2 Speed Manual (ends 1990)
1940 - 3 Speed Manual (ends 2000)
1950 - 4 Speed Manual
1960 - 2 Speed Automatic (ends 1990)
1965 - 5 Speed Manual
1965 - 3 Speed Automatic (ends 2000)
1980 - 4 Speed Automatic
1995 - 6 Speed Manual
1995 - 5 Speed Automatic
2005 - 4 Speed Sequential Single Clutch
2005 - 5 Speed Sequential Single Clutch
2005 - 6 Speed Sequential Single Clutch
2010 - 6 Speed Automatic
2010 - 4 Speed Sequential Double Clutch
2010 - 5 Speed Sequential Double Clutch
2010 - 6 Speed Sequential Double Clutch
2012 - 7 Speed Manual
2012 - 7 Speed Automatic
2012 - 7 Speed Sequential Single Clutch
2012 - 7 Speed Sequential Double Clutch
2014 - 8 Speed Automatic
2014 - 8 Speed Sequential Single Clutch
2014 - 8 Speed Sequential Double Clutch
2016 - 9 Speed Automatic
2016 - 9 Speed Sequential Single Clutch
2016 - 9 Speed Sequential Double Clutch
DIFFERENTIALS
1940 - Open
1940 - Manual Locker
1950 - Automatic Locker
1970 - Viscous LSD
1980 - Geared LSD
1995 - Electric LSD
MINIMUM TYRE PROFILE
1940 - 105
1941 - 100
1945 - 95
1949 - 90
1953 - 85
1957 - 80
1960 - 75
1964 - 70
1968 - 65
1972 - 60
1976 - 55
1980 - 50
1983 - 45
1987 - 40
1991 - 35
1995 - 30
1999 - 25
2003 - 20
2006 - 15
RIM MATERIAL
1940 - Steel
1980 - Alloy
2000 - Magnesium
2015 - Carbon Fibre
BRAKES
1940 - SLS Drums
1955 - 2LS Drums
1965 - Solid Disc
1975 - Vented Disc
2000 - Carbon Ceramic
BRAKE PISTONS
1965 - 1 Piston
1965 - 2 Piston
1975 - 3 Piston
1990 - 4 Piston
2000 - 6 Piston
UNDERTRAY
1940 - None
1940 - Offroad Skidtray
1960 - Semi Clad
1975 - Fully Clad
1995 - Downforce
ACTIVE STUFF
1995 - Cooling Flaps
2005 - Active Wing
ENTERTAINMENT
1940 - None
1940 - Luxury AM radio
1945 - Premium AM radio
1950 - Standard AM radio
1955 - Basic AM radio
1955 - Phonograph
1970 - Luxury 8 Track
1972 - Premium 8 Track
1974 - Standard 8 Track
1976 - Basic 8 Track
1982 - Luxury Cassette
1983 - Premium Cassette
1986 - Standard Cassette
1988 - Basic Cassette
1992 - Luxury CD
1994 - Premium CD
1998 - Standard CD
2001 - Basic CD
2003 - Luxury Sat-Nav
2005 - Premium Sat-Nav
2010 - Luxury Infotainment
2011 - Premium Infotainment
2012 - Standard Infotainment
2013 - Basic Infotainment
2017 - Luxury HUD
2019 - Premium HUD
DRIVER AIDS
1960 - Power Steering
1971 - ABS
1980 - Traction Control
1990 - Electronic Stability
2000 - Launch Control
SAFETY
1940 - None
1940 - Advanced 40’s
1945 - Standard 40’s
1950 - Advanced 50’s
1955 - Standard 50’s
1960 - Advanced 60’s
1965 - Standard 60’s
1968 - Basic 60’s
1970 - Advanced 70’s
1975 - Standard 70’s
1978 - Basic 70’s
1980 - Advanced 80’s
1985 - Standard 80’s
1988 - Basic 80’s
1990 - Advanced 90’s
1995 - Standard 90’s
1998 - Basic 90’s
2000 - Advanced 00’s
2005 - Standard 00’s
2008 - Basic 00’s
2010 - Advanced 10’s
2015 - Standard 10’s
2018 - Basic 10’s
SPRINGS
1940 - Standard
1955 - Progressive
1965 - Hydropneumatic
1975 - Air
2010 - Active Sport
2010 - Active Comfort
DAMPERS
1940 - Twin Tube
1970 - Gas Mono Tube
1990 - Adaptive
2010 - Semi Active
SWAYBARS
1940 - Passive
2005 - Semi Active
2010 - Off Road
2015 - Active