That is a High Ouput. In those years in, the 2nd gen trucks, the only way you could get a 6-speed (except for 2000 I beleive) is to get the high output. I have a HO as well and there is nothing that indicates it is a HO. The Standard outputs are autos and 5sp. and put 235hp. you only get 10hp and 50ft of torque