Automatic trans shifts hard 1 to 2 gear 94 Sonoma?

A hard shift from 1st to 2nd gear in a 1994 GMC Sonoma with an automatic transmission can be caused by several issues, including low Transmission Fluid, a faulty shift solenoid, or worn internal components. Check the fluid level and condition first; low or dirty fluid can affect shifting performance. If the fluid is fine, a diagnostic scan may be needed to check for error codes or solenoid issues. If problems persist, consulting a professional mechanic is advisable.