700r4 shifting early

[jrpitdog]

I have a stock sbc and 4.10 gearing running 30" tires. My truck shifts early across all gears. I dont have a working tach so I cant actually tell the rpms but its really noticeable when it hits od. If I am easily accelerating, it will hit od at no faster than 35, even a little sooner. It also takes forever to down shift. Anyways Im sure its a gearing issue, I fairly confident that the tv cable is adjusted correctly. So should I get a governor calibration kit or just a different governor? I have a oil pressure test gauge but without a tach I cant do the test properly.