* Specific manufacturer: Different manufacturers (e.g., GM, BorgWarner, etc.) have different designs and materials, resulting in different weights.
* Year of manufacture: Even within a manufacturer's line, designs and materials can change over time affecting the weight.
* Options and accessories: Additional components like a cooler or specific torque converter will add weight.
A 350 gm transmission (assuming you mean a Turbo 350, a common GM automatic transmission) generally weighs between 60 and 80 pounds (27 and 36 kg). However, this is a rough estimate, and the actual weight could be slightly higher or lower. To know the exact weight for a specific transmission, you'd need to consult the manufacturer's specifications or weigh the transmission itself.