I'm assuming you are referring to the sensitivity of the MMA7341LC device. Below is a snapshot of a table from the datasheet in page 3 with sensitivity numbers.
If you were looking for something else, please elaborate on what you mean by 'G degree from voltage value'?
Just a quick note, the MMA7341LC has been discontinued without a direct pin-to-pin compatible replacement (see PCN15634 for more details).
I would recommend using a new analog-output accelerometer - FXLN83xxQ (±2/8g or ±4/16g, 12-pin QFN package, 1.71V to 3.6V supply voltage, 180uA supply current in Active mode).
We have a product using MMA7341L accelerometer. The self-test z-axis reading is high (1.6g) and out of the range (0.8 ~ 1.2g) specified by datasheet. Is this device not factory trimmed either? Do you have a technical bulletin released for this self-test issue?