How to Find the Gear Ratio of a 1994 GMC 1500

by Blaze Johnson

The 1994 GMC Sierra 1500 is a full-size pickup truck that features power brakes, power steering, antilock brakes and standard front airbags. Base models utilize a 4.3-liter V6 engine and five-speed manual transmission. Optional engines include the 5.0 and 5.7-liter gasoline motors, as well as a naturally aspirated or turbocharged 6.5-liter diesel. If you wish to make modifications or repairs to the drivetrain, you may wish to identify the gearing ratios for transmission and drive axles. Determining the gear ratios used for your vehicle is an easy task when using the proper research methods.

Step 1

Examine the inside of the vehicle’s glove compartment and locate the large square-shaped RPO label. The label contains several three-digit codes that indicate the trim options installed on your truck, as well as information relating to the drivetrain.

Step 2

Search the label carefully for codes beginning with the letter “M” and “G”. Write the codes down on a piece of paper. The RPO code beginning with “M” relates to the transmission installed on your vehicle, while “G” codes represent the drive axle(s).

Step 3

Open your computer’s Web browser and navigate to the “RPO Code Lookup” Web page (See Resources). Enter the RPO code beginning with “G” into the “Search for:” box displayed on the Web page and click on the “Search” button.

Step 4

Examine the results displayed on the Web page relating to your vehicle’s axle ratio.

Step 5

Navigate to the “General Motors Corporation Transmission Gear Ratios” Web page. Examine the left-hand columns marked “RPO” to locate the matching “M” RPO code relating to your vehicle. The columns positioned next to the appropriate RPO code will list the gear ratios for the vehicle’s transmission.

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