Description
29539579 Spin-On Transmission Fluid Filter — Allison 1000/2000/2400 Series
The iFJF 29539579 Spin-On Automatic Transmission Fluid Filter is a direct replacement for Allison 1000, 2000, and 2400 series automatic transmissions found in GM Duramax diesel trucks and medium-duty commercial vehicles. This filter replaces the old-style Allison part number 29537268 and provides high-efficiency filtration to protect your transmission's valve body, clutch packs, and torque converter from wear particles and debris.
Allison transmissions are known for their durability — regularly reaching 300,000+ miles in commercial service — but they require clean ATF to achieve that lifespan. Contaminated fluid causes sticking valves, delayed shifts, and accelerated clutch wear. This spin-on filter captures particles as small as 25 microns while maintaining full transmission fluid flow under all operating conditions — from cold morning starts to heavy towing at highway speeds.
Key Features
-
Direct Allison Replacement: Replaces Allison 29539579 and old-style 29537268 spin-on transmission filters — exact dimensional match, guaranteed fit
-
High-Efficiency Filtration: Multi-layer media captures wear particles, clutch material, and debris down to 25 microns — protecting precision valve body components
-
Heavy-Duty Construction: Thick-gauge steel canister with corrosion-resistant coating withstands under-vehicle exposure to road salt, water, and debris
-
Spin-On Design: Quick external filter change — no dropping the transmission pan required
-
Silicone Anti-Drainback Valve: Maintains fluid in the filter between starts for immediate transmission protection on cold starts
Transmission Compatibility
| Transmission |
Series |
Fluid Type |
| Allison 1000 |
5-speed / 6-speed automatic |
TES-295 / TES-668 ATF |
| Allison 2000 |
5-speed / 6-speed automatic |
TES-295 / TES-668 ATF |
| Allison 2400 |
6-speed automatic |
TES-295 / TES-668 ATF |
Common Vehicle Applications
| Year |
Make |
Model |
Engine |
| 2001-2019 |
Chevrolet |
Silverado 2500HD / 3500HD |
6.6L Duramax V8 |
| 2001-2019 |
GMC |
Sierra 2500HD / 3500HD |
6.6L Duramax V8 |
| Various |
Multiple |
Medium-duty trucks, buses, specialty vehicles |
Allison-equipped platforms |
Technical Specifications
| Specification |
Value |
| Filter Type |
Spin-On External Transmission Filter |
| Replaces |
Allison 29539579, 29537268 (old style) |
| Filtration Rating |
25 micron absolute |
| Thread Size |
Allison OEM-spec |
| Service Interval |
Every transmission fluid change (25,000-50,000 miles depending on duty cycle) |
| SKU |
FJ-9579 |
Why Replace Your Allison Transmission Filter?
The Allison 1000/2000/2400 uses an external spin-on filter as its primary filtration stage (the internal pan filter is secondary). Over time, this external filter loads with clutch friction material, metal wear particles from gears and bearings, and oxidized fluid debris. A clogged filter restricts ATF flow — causing delayed engagement, slipping shifts, overheating, and eventual transmission failure. Replacing the spin-on filter at every fluid change is the simplest and most effective thing you can do for Allison transmission longevity.
FAQ
Q: Is this the spin-on external filter or the internal pan filter?
A: This is the external spin-on filter — the one accessible without dropping the transmission pan. Allison 1000/2000/2400 transmissions use two filters: (1) An external spin-on filter (this part) that captures larger particles and is changed every fluid service, and (2) An internal pan filter that requires dropping the pan for replacement during major services. Replace the spin-on filter at every ATF change for maximum protection.
Q: Does this fit my 2006 Duramax with Allison transmission?
A: Yes — every Duramax-powered Silverado HD and Sierra HD from 2001 through 2019 uses the Allison 1000 series transmission (5-speed or 6-speed depending on year). This filter fits all of them. If your truck has the 6.6L Duramax diesel, it has an Allison — and this is the correct spin-on filter.
Q: What's the difference between 29539579 and 29537268?
A: 29537268 is the old-style Allison part number that has been superseded by 29539579. The 29539579 is the current production filter with improved media and anti-drainback valve design. Our filter replaces both numbers — if your service manual calls for either, this is the correct part.
Q: How often should I change the Allison transmission spin-on filter?
A: Allison recommends filter replacement at every transmission fluid change interval: 25,000 miles for severe duty (towing, commercial use, stop-and-go) and 50,000 miles for normal highway driving. Many Duramax owners servicing their own trucks change the spin-on filter at 30,000-mile intervals and do a full pan-drop with internal filter at 60,000-90,000 miles. Always follow your owner's manual for the specific Allison transmission in your vehicle.
Q: What transmission fluid should I use with this filter?
A: Use Allison-approved TES-295 or TES-668 specification ATF. Common options include Allison TranSynd, Mobil Delvac 1 ATF, and Castrol TranSynd. Do NOT use Dexron III or conventional ATF — Allison transmissions require TES-295 spec synthetic fluid. Using the wrong fluid can cause shift quality issues and accelerated wear. Check your owner's manual for the exact fluid specification for your model year.
Q: Can I use this filter on a non-Allison transmission?
A: No — this filter is specifically designed for Allison 1000, 2000, and 2400 series automatic transmissions. The thread pattern, gasket surface, and bypass valve settings are unique to Allison spin-on filter mounts. Using this on a different transmission (such as the GM 4L80E or Ford TorqShift) will result in a poor fit or no fit at all. Always verify your transmission model before ordering.
Q: Do I need to drop the transmission pan to change this filter?
A: No — the spin-on external filter is accessible from underneath the vehicle without removing the transmission pan. A standard filter wrench (or strap wrench for tight spaces) is all you need. Expect to lose about 0.5-1 quart of ATF when the filter is removed — have a drain pan ready. Top off the transmission fluid level after installation using the correct TES-295 spec ATF.
📖 Related Guides
🔧 Related Products
