Frequently Asked Questions About International S1700-S1900 Drivetrain Parts
What years and specific models do these drivetrain parts fit?
These drivetrain parts are designed for International S1700, S1800, and S1900 series trucks manufactured between 1979 and 2004. The S1700 and S1800 models typically use the same drivetrain components, while S1900 models may require heavy-duty variants. Always verify your specific model year and OEM before ordering, as International made mid-year changes that can affect compatibility.
What are the most common driveshaft and U-joint failures I should watch for?
The most frequent issues include worn carrier bearings (typically need replacement every 100,000-150,000 miles), U-joint wear causing vibration at highway speeds, and slip yoke seal leaks. For S1700-S1900 models, the rear driveshaft center support bearing is particularly prone to failure due to the truck's weight distribution. Regular greasing every 5,000-7,500 miles can extend U-joint life significantly.
Can I upgrade to heavy-duty drivetrain components if I'm hauling heavier loads?
Yes, many S1700 and S1800 owners successfully upgrade to S1900-spec drivetrain components for increased durability. This typically includes upgrading to 1410 or 1480 series U-joints, heavy-duty slip yokes, and thicker-walled driveshaft tubing. These upgrades are especially recommended if you're consistently hauling over 20,000 lbs or operating in mountainous terrain.
What tools and expertise do I need to replace drivetrain components myself?
Basic driveshaft removal requires a socket set, pry bar, and jack stands. However, driveshaft balancing requires specialized equipment and should be done professionally. U-joint replacement needs a U-joint press or heavy-duty vise, snap ring pliers, and a brass drift. Most experienced mechanics can handle U-joint replacement, but carrier bearing replacement often requires dropping the exhaust system and heat shields, making it a 3-4 hour job.
How do I identify the correct differential ratio and carrier type for my truck?
Check the metal tag on your differential housing or look for stamped numbers on the carrier itself. S1700-S1900 trucks commonly came with Rockwell, Eaton, or Spicer differentials with ratios ranging from 3.70 to 5.57. The RPO code sticker in your glove box also lists the original ratio. When ordering parts like ring and pinion sets or carrier assemblies, you'll need both the ratio and the differential model number (such as Eaton DS402 or Rockwell RS-21-145).
