▁as ▁standard ▁and ▁with ▁a ▁fully ▁syn chrom esh ▁g ear box , ▁was ▁made ▁available ▁in ▁ 1 9 6 2 , ▁the ▁final ▁year ▁of ▁TR 3 ▁production . ▁ ▁This ▁last ▁version ▁of ▁the ▁TR 3 ▁was ▁uno fficial ly ▁known ▁as ▁the ▁TR 3 B . ▁ ▁TR 4 , ▁TR 4 A , ▁TR 5 , ▁TR 2 5 0 , ▁and ▁TR 6 ▁ ▁Int rodu ced ▁in ▁ 1 9 6 1 , ▁the ▁TR 4 ▁had ▁a ▁completely ▁new ▁body ▁designed ▁by ▁Giovanni ▁Michel otti . ▁The ▁TR 4 ▁was ▁upgrad ed ▁to ▁the ▁TR 4 A ▁in ▁ 1 9 6 5 ▁with ▁the ▁addition ▁of ▁independent ▁rear ▁susp ension . ▁ ▁In ▁ 1 9 6 7 , ▁the ▁TR ▁line ▁was ▁updated ▁with ▁ser vo - ass isted ▁bra kes ▁and ▁a ▁ 2 . 5   L ▁version ▁of ▁the ▁straight - six ▁engine ▁that ▁had ▁been ▁used ▁in ▁the ▁Tri umph ▁ 2 0 0 0 . ▁ ▁Two ▁different ▁models ▁were ▁made : ▁the ▁TR 2 5 0 ▁with ▁two ▁St rom berg ▁car b ure tt ors ▁for ▁the ▁US ▁market , ▁and ▁the ▁TR 5 ▁with ▁Lucas ▁fuel ▁injection ▁for ▁the ▁rest ▁of ▁the ▁world . ▁ ▁Both ▁the ▁TR 2 5 0 ▁and ▁the ▁TR 5 ▁were ▁replaced ▁by ▁the ▁TR 6 ▁in ▁ 1 9 6 8 , ▁with ▁the ▁US ▁version ▁continu ing ▁with ▁car b ure tt ors . ▁ ▁The ▁main ▁difference