1-2 shift at 4750
2-3 shift at 5250

why different? and how can I adjust?

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Gunmetal 89GTA T-Tops L98
Gettin there's all the fun
Best 60 ft: 1.996'
Best 1/8th mile: 9.02 @ 76.5mph with 60' time of 2.14
Mods: air filter, hypertech chip, 3" exhaust

 

You can adjust the shift points with the governor. I don't know why they are different. It may be so the engine doesn't fall below it's power band when it shifts through it's funky ratio spread

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

 

remove weights from your governor so that it shifts at a lower rpm.
You should manually shift 1-2 @500 rpms higher than your 2-3 shift in order to maintain the same shift recovery rpm at your torque peak.

ODB