The steering gear is factory filled with a lubricant which does not require seasonal change. The housing should not be drained; no lubrication is required for the life of the gear.
The gear should be inspected for seal leakage when specified in the Maintenance Chart. Look for solid grease, not an oily film. If a seal is replaced or the gear overhauled, it should be filled with Part No. 1051052 which meets GM Specification GM 4673M, or its equivalent. Do not use EP Chassis Lube to lubricate the gear and do not overfill.