Description
When your 18-speed transmission starts acting up—maybe gear changes aren’t as smooth as they used to be, or you’re noticing fluid where it shouldn’t be—these transmission seals are often the simple fix that gets you back to smooth shifting. Speed shift transmissions let you change ranges without clutching or stopping, whether you’re shifting from field range to road range or adjusting for different implements. When seals fail, that convenience goes right out the window.
What You’re Getting
- Two seals per set because speedshift rebuilds require 2 sets per tractor—no need to order twice
- Hydraulic fluid resistant construction that stands up to the pressures in your transmission
- Precision fit that seals properly without binding moving parts
- Quality materials that maintain flexibility through temperature changes and normal wear
Built for Real Farm Work
These seals fit the 18-speed transmissions in Massey Ferguson 300 series (365, 375, 390, 398, 399), 4200 series (4225-4270), and 4300 series (4325-4365) tractors. Whether you’re running a loader, pulling planters, or doing heavy fieldwork, these tractors with their speed shift transmissions are built for versatility—and these seals keep that system working right.
Made to Last
Transmission seals deal with constant pressure, temperature changes, and hydraulic fluid that can be tough on inferior materials. These seals use special compounds designed for hydraulic applications that resist swelling and deterioration while maintaining flexibility throughout their service life.
Good to Know
Installation requires splitting the tractor and complete disassembly of the speedshift unit—this isn’t a quick roadside fix. While you’re in there, it’s smart to replace all seals and inspect other wear items. Clean everything thoroughly because any contamination can affect transmission operation. Also check your transmission fluid level and condition—low or contaminated fluid causes shifting issues that new seals won’t fix.
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