The 2021 International LT has 6 automatic transmission parts with verified fitment on this page — 1 part type and 3 brands, covering both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 International LT, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. Every listed part is a Filter.
The 2021 International LT was sold with both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 International LT automatic transmission parts are VARIOUS MFR (2 parts), WIX (2 parts) and HASTINGS / BALDWIN (2 parts). Quality grades include Standard Replacement and Economy.
1 part on this 2021 International LT page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — WIX 51348 (Filter). Click any part number to see every vehicle that part fits.
Filter
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VARIOUS MFR Fits: 14.9L L6 DIESEL Turbocharged | PG241 | 🇺🇸 US 🇨🇦 CA | Spin-On | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WIX Popular Fits: 14.9L L6 DIESEL Turbocharged | 51348 | 🇺🇸 US 🇨🇦 CA | Spin-On Filter | View on Amazon |
| HASTINGS / BALDWIN Fits: 14.9L L6 DIESEL Turbocharged | B2 | 🇺🇸 US 🇨🇦 CA | Spin-On | View on Amazon |
| VARIOUS MFR Fits: 14.9L L6 DIESEL Turbocharged | PG241EX | 🇺🇸 US 🇨🇦 CA | Extended LifeSpin-On | View on Amazon |
| WIX Fits: 14.9L L6 DIESEL Turbocharged | 51622 | 🇺🇸 US 🇨🇦 CA | Spin-On Filter | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HASTINGS / BALDWIN Fits: 12.4L L6 DIESEL Turbocharged | B2 | 🇺🇸 US 🇨🇦 CA | Spin-On | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
6 Filter parts for the 2021 International LT come from 3 brands — VARIOUS MFR, WIX and HASTINGS / BALDWIN. The "Popular" part is WIX 51348.
The Economy section lists 1 option from VARIOUS MFR — the catalog's value-priced group. VARIOUS MFR PG241 is listed in this group.
In the Standard Replacement grade, WIX, HASTINGS / BALDWIN and VARIOUS MFR supply 4 parts: built to original-equipment specification. A representative part number is WIX 51348.
1 further part sits outside the graded sections, with the same engine-level match.
Part numbers include WIX 51348, VARIOUS MFR PG241 and HASTINGS / BALDWIN B2, among others listed above.
Buying Automatic Transmission Parts for a 2021 International LT
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Match the engine first. Every automatic transmission part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Filter .
Frequently Asked Questions
How many automatic transmission parts fit the 2021 International LT?
Our catalog currently lists 6 automatic transmission parts for the 2021 International LT across 1 subcategory and 3 brands, covering both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.
Do automatic transmission parts differ between 2021 International LT engines?
Yes. Every automatic transmission part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of automatic transmission problems on a 2021 International LT?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 International LT was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 International LT?
First match the engine — each row shows which engine(s) the part fits. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 International LT
Automatic Transmission Parts for Other International LT Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.