1. Automatic Transmission: The average cost of automatic transmission repair for a 1993 GMC 4X4 Suburban can range from approximately $1,500 to $2,500. This cost includes the transmission removal and reinstallation, repair or replacement of damaged components, and transmission fluid replacement.
2. Manual Transmission: If your Suburban has a manual transmission, the average repair cost may be slightly lower, typically ranging between $1,000 and $2,000.
However, it's essential to note that these are just estimates, and the actual cost may vary significantly based on the specific issues with your vehicle's transmission. For a more accurate estimate, it's recommended to consult a reputable auto repair shop or a dealership that specializes in GMC vehicles.