Anyone using 4.10 gears and a 28" tall tire? What RPM are you trapping at N/A 1/4 mile? I just switched from a 3.73 to 4.10's. 6200 rpm is about the limit on my hyd roller. May need to change tire to 29" or get a rev kit.
454RAT said:I have a 68 chevelle with a 355 with about 400hp. (dyno at rear wheels was 290 and 340lb tq) I was running 12.89 in the quarter at 104mph with 3.31 gears and 255/50/16 MT Drag Radials. I changed nothing other than size tire and went back to the track with new MT Drag Radials (295/50/16) And in same weather condtions as the 12.89 @ 104 I ran a 12.67@107 mph.........
What im saying is, if your combo is mild it is easy over gear it and take it out of its peak RPM band and lose HP. My combo is a example of this.