The TR3A wis a minor update frae the TR3. The updates includit the new wide front grill, exterior door haundles, lockable buit haundle an came wi a full tuil kit is standard (this wis an option on the TR3).
The Triumph TR3 wis the first production caur tae include standard disc brakes, which wur continued on the TR3A. The caur wis kent for its superior brakin ability, makin it an autocross favourite.
The TR3A is aften seen in Vintage an Production racin the day. The TR3A, despite bein almaist 50 years auld, is still competitive in the E-Production cless o SCCA (Sports Car Club of America).
In Juin 1977, Road & Track magazine published an airticle titled "Driving Impressions: TR3A & TR250" in its 30t anniversary issue. It published a 0-60 time o 12.0 seconds, pouer ootput o 100 bhp (75 kW) at 4800 rpm, observed curb wecht o 2,090 lb (948 kg) an fuel consumption o 28 miles per imperial gallon (10 L/100 km; 23 mpg-US).