2nd gear power

[GenIII_4Ever]

Ok my first gear is great like throw you in the seat great. But second is a different story I put it in second at about 40mph floor it and it takes off average like 1 to 10 its a 5 maybe 4 1/2. So what can I do to get second to jump like first? I was thinking 4:10s and a locker. Or a cam for that rpm range but didnt want to cam the 90000mile 4.8 u know. O yah and 3rd is even better than 2nd at 70mph I can floor it and it will down shift and jump like first. So I dont know if its a tune issue or what. So some knowledge would help. Thx Guys