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the 4l80e and np205 combo is VERY hard to come by stock. 91 is the year the 4l80 came out and they only put the two together in the 91 crew cabs. you can piece a 4l80 and 205 together for about 1500 (trans 500-800, tcase you need a 32 spine but you can make a 10 spline work for another 150 and 300 for the case and a adapter for i think 250-300) not to mention either a stand alone computer for the 4l80 or you can turn it into a manual automatic. 100-800.