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How to Find Out What Rear End My Peterbilt Has

by Jeff Woodward

Peterbilt manufactures class eight vehicles. A "rear end" is a common term used by truck drivers and mechanics to mean a rear axle and differential. Peterbilt trucks are built using parts from a variety of vendors and the axles are no exception. Determining what brand axle a Peterbilt was built with will help the owner in determining part identification for repairs.

Step 1

Crawl under the forward-rear axle of the truck using the creeper. Position yourself under the passenger side axle shaft.

Step 2

Spray brake cleaner onto the shaft to loosen dirt and grease. Wipe the axle shaft clean with a shop towel or old rag.

Step 3

Locate the numbers that are stamped into the metal on the rear side of the axle shaft. Write the axle specification number on a piece of paper.

Step 4

Position the creeper underneath the left side of the forward-rear axle.

Step 5

Spray brake cleaner onto the axle-shaft and wipe clean with a shop towel or old rag.

Step 6

Locate the identification tag on the forward side of the axle-shaft. Write the identification number on a piece of paper.

Step 7

Position yourself over the differential on the forward-rear axle by leaning over the frame.

Step 8

Spray brake cleaner onto the top of the differential housing. Wipe clean with a shop towel or old rag.

Step 9

Locate the differential identification numbers which are either on a metallic tag or stamped on the top of the housing. Write the numbers down on a piece of paper.

Repeat the steps on the rear-rear axle if necessary.

Items you will need

  • Flashlight
  • Brake cleaner
  • Shop towel or old rag
  • Creeper
  • Vehicle identification number (VIN)

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