The transmission filter is one of the cheapest and most important maintenance items. A clogged filter starves the trans of fluid, causing pressure problems and accelerated wear. Here's the complete guide to trans filter service.
What the filter does
The transmission filter:
- Catches debris before it reaches the pump
- Prevents wear material from damaging clutches and bushings
- Protects the valve body from solenoid clogging
- Filters out gasket and friction material
A clogged or torn filter causes:
- Pressure problems
- Pump damage
- Solenoid issues
- Accelerated internal wear
Filter types
Pickup filter (most common)
Used in: 4L60E, 4L80E, 700R4, TH350, TH400, AX4N, 4R70W, most automatics
Location: Mounted inside pan, picks up fluid from pan
Material: Synthetic or paper media in metal/plastic frame
Cost: $15-40 typical
Service: Replace at every pan drop
Internal cartridge filter
Used in: 6L80, 8L90, 10L80, modern transmissions
Location: Inside the trans (not visible from pan)
Material: High-flow synthetic
Cost: $20-60
Service: May not need regular replacement, but check with service manual
Spin-on external filter
Used in: 47RE, 48RE, 68RFE, some Allison applications
Location: External, like an oil filter
Material: Synthetic media
Cost: $15-40
Service: Replace at every fluid service
Combined pickup + cartridge
Used in: Some newer transmissions
Location: Combination unit
Cost: $30-80
Service: Per manufacturer schedule
Filter brand recommendations
Quality OEM-equivalent
- ACDelco for GM applications
- Motorcraft for Ford applications
- Mopar for Chrysler/Dodge applications
- Allison for Allison transmissions
- Wix for general transmission filters
- Hastings for general filters
Performance / aftermarket
- B&M for some specific applications
- PerformaBuilt for build applications
- Sonnax HD for some applications
Brands to avoid
- Unknown / generic filters
- Cheap eBay / Amazon "deluxe" filters
- Filters without brand marking
When to change the filter
At every pan drop
If you're draining the pan, change the filter. They're cheap and the trans is open anyway.
Mileage-based service:
- Daily driver: Every 30-50K miles
- Tow rig: Every 25-30K miles
- Performance: Every 20-30K miles
- Severe duty: Every 15-25K miles
After major events:
- After rebuild (with new fluid)
- After any fluid contamination
- After cooler line replacement
- After overheating event
Diagnostic-driven:
- If pan shows wear material
- If line pressure has dropped
- If shift quality has degraded
Filter installation tips
Universal tips:
1. Use new filter every time
2. Inspect pickup tube and seal before installing new filter
3. Verify orientation — some filters have a specific direction
4. Don't overtighten mounting bolts
5. Use new gaskets and seals where applicable
Pickup tube seal:
- The seal between pickup tube and pump body
- Cheap to replace ($5-15)
- Replace whenever filter is replaced
- Old seal = pressure loss / air ingestion
Common installation mistakes:
- Reusing old pickup tube seal
- Installing filter backwards (where applicable)
- Wrong filter for application
- Overtightening mounting bolts
- Not seating filter fully
Specific transmissions
4L60E / 4L65E
- Quality OEM-equivalent pickup filter
- Filter has rubber pickup tube seal — replace
- Standard service every 30-50K
- Cost: $15-30
4L80E
- Pickup filter with seal
- Service every 25-50K depending on use
- Cost: $20-40
6L80 / 6L90
- Internal cartridge filter (in newer style)
- May or may not need regular replacement
- Verify with service manual
- Cost: $20-50
8L90 / 8L45
- Internal cartridge filter
- Check service intervals
- Cost: $30-60
700R4
- Pickup filter
- Service every 30-50K
- Cost: $15-25
TH350 / TH400
- Pickup filter
- Service every 30-50K
- Cost: $10-20
47RE / 48RE
- Spin-on external filter
- Service every 30K severe
- Cost: $15-30
68RFE
- Spin-on external filter
- Service every 30K for tow rigs
- Cost: $25-40
Allison 1000
- External spin-on filter
- Service every 50K for daily driver
- 25K for tow rigs
- Cost: $20-50
Ford 4R70W / 4R75W
- Pickup filter
- Service every 30-50K
- Cost: $15-30
Ford 5R110W / 6R80
- Pickup filter or internal cartridge
- Verify by year
- Cost: $20-50
Ford 10R80
- Newer design
- Filter location and type varies
- Cost: $20-60
Pan + filter service kit recommendations
For 4L60E rebuild or service:
- ACDelco filter kit: $25-35
- Quality aftermarket: $20-30
- Includes pan gasket and filter
For 4L80E rebuild or service:
- ACDelco filter kit: $30-45
- Quality aftermarket: $25-35
For 68RFE rebuild or service:
- Mopar filter kit: $35-50
- Quality aftermarket: $25-40
For Allison rebuild or service:
- Allison spec filter: $25-40
- Quality aftermarket: $20-30
Cost breakdown
DIY filter service:
- Filter: $15-50
- Pan gasket: $20-40
- Pickup tube seal: $5-15
- Fresh fluid: $50-200
- Total: $90-305
Shop filter service:
- Same parts: $80-200
- Labor: $100-200
- Total: $180-400
How to know if filter needs replacement
Signs of clogged or failing filter:
- Hesitation in shifts (low pressure)
- Whining sound from trans (cavitation)
- Stalling on takeoff (pump starved)
- Codes for pressure issues
- Trans temps higher than normal
Inspect old filter for:
- Visible debris on media
- Discoloration (burnt look)
- Tears or damage
- Excessive wear material
What we sell
ACDelco, Motorcraft, Mopar, Wix, Allison-spec filters, plus pickup tube seals, pan gaskets, and quality aftermarket filters for every common transmission. Filter kits with everything needed for a complete service.
Need a transmission filter kit? Shop our filter catalog. OEM and quality aftermarket filters, pan gaskets, pickup seals for every common transmission. Free shipping over $70.
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