My 92 D150 with a 518 has a lock up converter, I talked to Lenny at Ulitimate about it , he said he could redo it, he did and I am very happy with the results: my 60 ft times dropped from high 2. teens-low 2.20s to 2.00s with a best of 2.03 running low 15s ( 4.10 sure grip rear)