IM getting a weird noise when driving our Chevy.

First, dont take it to the dealer. Any shop can do this for you.

Second, what kind of noise? Where? When? Under what conditions?

Low fluid level would give you other symtoms

Roy

Transmission Fluid Checking Procedure
Description
Inspection of the transaxle fluid level, correct type of fluid, and the condition of the fluid for accurate operation of the transaxle.

Procedure

Important: Routine inspection of the transaxle fluid is not required. Transaxle fluid inspection is only required if there is a symptom indicating a concern with the fluid.

Park the vehicle on a flat level surface.

Operate the vehicle in order for the transmission fluid temperature to reach the normal operating range. Transaxle normal temperature: 60 - 70°C (140 - 158°F)
With the engine at idle, manual shift through all transaxle ranges and return to the PARK position. Leave the engine idling.
Clean any dirt or debris away from the area of the transaxle fluid level indicator.
Remove the transaxle fluid level indicator bolt (1) from the transaxle.
Remove the transaxle fluid level indicator (2).
Wipe away any transaxle fluid from the indicator.
Insert the indicator into the transaxle until fully seated.

Important: Inspecting transaxle fluid level when not at normal temperature can give an incorrect measurement. The transaxle fluid expands when warm.

Remove the indicator and inspect the level and the condition of the oil on the indicator:

Transmission fluid level at normal operating temperature (1)
Transmission fluid level if cold (2)

If the fluid level is incorrect inspect for the following conditions:

Fluid below level, inspect for a leak.
Fluid above level, inspect for contamination of the fluid.

Important: The transaxle uses T-IV fluid, GM P/N 88900925 (Canadian P/N 22689186). The fluid is normally red in color. The oil may darken in color with more miles on a vehicle.

Inspect the condition of the fluid for the following conditions:

Excessively dirty with particles in the fluid
If there are no DRIVEABILITY concerns, replace the fluid.
If DRIVEABILITY concerns are present disassemble and inspect for a cause.
Burnt smell
Inspect for the correct fluid.
Inspect for conditions that may of cause overheating of the transmission fluid.
If there are no DRIVEABILITY concerns, replace the fluid.
If DRIVEABILITY concerns are present disassemble and inspect for cause.
Inspect the transmission oil cooler system for functioning properly.
Black in color
Disassemble the transaxle and inspect for components that may have over heated.
Inspect the transmission oil cooler system for functioning properly.
Milky or white tint in color from coolant or water
Inspect for failure of the transaxle oil cooler.
Inspect for missing or improperly routed vent hose.
Inspect for missing fill plug.

Install the fluid level indicator.
Notice: Refer to Fastener Notice in Service Precautions.

Install the fluid indicator bolt.

Tighten the fluid indicator bolt to 10 Nm (89 inch lbs.).