TRD = Toyota Racing Development check out
www.trdusa.com
As for SR5 its the hi-lux options that you can get added on to your vehicle purchase. New SR5 models come with the options I listed below, but you might have something a little different, but similar. I have a 2001 Tacoma Prerunner SR5 and have the same upgrades as below.
SR5 Chrome Package -- includes chrome bumpers and grille surround, defroster-linked CFC-free air conditioning, dual-fabric sun visors with mirror and visor extensions, orange-illuminated white-faced gauges (speedometer, tachometer with LCD twin tripmeters, and coolant temperature and fuel-level meters), digital clock, tilt steering wheel, washer-linked variable intermittent windshield wipers and Deluxe AM/FM Cassette/CD with four speakers (Regular Cab) or six speakers (Xtracab and Double Cab)
