Peterbilt 359 Drivetrain Parts

Frequently Asked Questions About Peterbilt 359 Drivetrain Parts

Will these drivetrain parts fit my specific year Peterbilt 359?

Most of our drivetrain components are compatible with Peterbilt 359 models from 1967 to 1987. However, there were minor changes throughout production years. For transmissions and differentials, 1967-1979 models typically use different mounting patterns than 1980-1987 models. Always check the specific part listing for year compatibility, or contact our support team with your OEM for exact fitment verification.

What's the difference between remanufactured and new aftermarket drivetrain parts?

Remanufactured parts are original components rebuilt to OEM specifications with new bearings, seals, and wear items - often carrying warranties comparable to new parts at 30-50% less cost. New aftermarket parts are manufactured by companies like Eaton, Spicer, and Meritor to meet or exceed original specifications. Both options are reliable, but remanufactured parts maintain original casting numbers which some restoration enthusiasts prefer.

Do I need special tools or expertise to install these drivetrain components?

Major drivetrain components like transmissions, differentials, and driveshafts require professional installation. You'll need specialized tools including transmission jacks, bearing pullers, and torque specifications. Most customers report spending $800-1,500 on professional installation. Smaller components like U-joints, yokes, and carrier bearings can be installed by experienced mechanics with standard shop tools.

How do I identify which transmission or rear end ratio I currently have?

Check the aluminum tag on your transmission housing for model numbers (common 359 transmissions include Fuller 9-speed and 13-speed models). For rear differentials, look for the ratio tag on the carrier housing or count ring and pinion teeth. Popular ratios for 359s range from 3.70 to 4.88. If tags are missing, our tech support can help identify components using casting numbers and tooth counts.

What maintenance items should I replace when installing drivetrain parts?

When replacing major components, always install new mounting hardware, seals, and fluids. For transmissions, replace the clutch release bearing, pilot bearing, and input shaft seal. For differentials, install new pinion seals and wheel seals. Budget an additional $200-400 for these maintenance items. Using proper GL-5 gear oil in differentials and approved transmission fluid is critical for longevity - avoid universal fluids.