I bought mine years ago the lower first and second is noticable. first time I installed it made a bunch of other changes. Drove it street strip for yearsI ended up braking the welds on it when the rear brakes locked on. anyway had it welded and was running 3600 lb gtx 440 11.5 to 1 indy SR heads home ported ultra dyne 263/271 @ .050 with .597/.620 lift 4000 stall would run 11.0's to 10.7's one year i had trans out for freshen I put the gear set back in no other changes as only the tranny came out. then it would run 10.9's to 10.6's.
pretty much always a tenth faster than the year before of what I had come to expect and of course PB was .1 faster
I now have 4.56 gears so first is like going to 5.10 second like 4.88 and drive course is the same 4.56. you are not in second longer as it is lower geared too. fair drop into third though.