Size 2nd 3rd 4th 6 Cyl .076 .063-.067 .076-.086 V8 & V10 .094 073-082 .094 Diesel .110~116 .073-.082 .086-.096 A bigger hole makes the shift firmer. After road test: Slightly firmer shift make hole .010 larger. A la! firmer make hole .030 larger. Step 1. Calibration Plate Shift firmness is affected by engine power, axle ratio, weight, computer strategy, and clutch quality. There's no way to get it perfect on first try. This plate lets you choose an aver- age firmness, then make changes if needed. The 2nd, 3rd 51 4th holes are .053 in the plate furnished. Select a start firmness and drill holes to that size. After road test you may change sizes to adjust firmness. For sure read thls: When using a custom LOW STALL converter, especlally wlth Diesel make hole sizes same as 6 cyl, then road test. Then enlarge holes for any shift you want firmer.