The 68RFE input bushing supports the input shaft and torque converter alignment. When it wears, you get vibration, noise, and eventual hard part contact. Here's the install procedure.
What the input bushing does
The 68RFE input bushing:
- Supports the front of input shaft
- Maintains torque converter alignment
- Carries radial load
- Critical to overall trans health
When working: smooth input shaft rotation, no vibration.
When worn: vibration, noise, alignment issues.
Read our best 68RFE rebuild kit
How it wears
Normal wear:
- Slow erosion over high mileage
- Predictable pattern
Accelerated wear:
- Tuned engines increase load
- Read our 68RFE billet input shaft
- Heat from sustained tow
- Read our diesel tow rig setup
Failure mode:
- Bushing wears, becomes oval
- Input shaft runs off-center
- Vibration develops
- Eventually metal-to-metal contact
Symptoms
Early stage:
- Slight vibration at specific RPM
- Mild whine from front of trans
- May be missed
- Read our transmission noise diagnosis
Mid stage:
- Clear vibration
- Whine more pronounced
- Possible codes
Late stage:
- Severe vibration
- Possible flexplate damage
- Read our 68RFE flexplate
Catastrophic:
- Hard part contact
- Input shaft damage
- Pump damage
- Read our 10 transmission warning signs
When to replace
During rebuild:
- ALWAYS
- Cheap part, big consequence if reused
Standalone:
- Possible but trans must come down
- Not cost-effective alone
- Combine with rebuild
Inspection criteria:
- Any visible wear
- Out-of-round measurement
- Scoring on inside surface
- Reused at your own risk
Quality bushing options
OEM bronze bushing:
- Standard wear part
- Cost: $20-40
- Adequate for stock applications
HD heat-treated:
- Better wear resistance
- Cost: $30-60
- For HD tow / tune
Sonnax HD bushing kit:
- Updated design
- Better material
- Cost: $40-80
Read our transmission parts buying guide
Installation procedure
Tools needed:
- Bushing driver set (critical)
- Hydraulic press OR
- Slide hammer
- Service manual
Steps:
1. Trans on bench
2. Remove existing bushing (slide hammer or press)
3. Clean bore thoroughly
4. Inspect bore for damage
5. New bushing oriented correctly
6. Use proper driver
7. Press to correct depth
8. Verify with measurement
Time: 30-60 minutes
Critical:
- Don't hammer directly
- Use proper driver
- Verify depth
- Don't damage bore
Common installation mistakes
Mistake 1: Using punch instead of driver
- Damages bushing
- Bushing fails fast
- Always use driver
Mistake 2: Wrong orientation
- Some bushings directional
- Verify before pressing
- Service manual
Mistake 3: Wrong depth
- Too deep: alignment off
- Not deep enough: same
- Use depth gauge
Mistake 4: Damaging bore
- Removing old bushing carelessly
- Bore damage = trans rebuild
- Slide hammer carefully
Read our 10 transmission rebuild mistakes
When you find bore damage
Bore is damaged:
- Bushing replacement won't fix
- May need case replacement
- Or bore repair (sleeve)
Bore is salvageable:
- Light scoring
- Clean and install new bushing
- Verify alignment
Bore is severely damaged:
- Trans case replacement
- Or full rebuild with new case
- Read our transmission parts buying guide
Pair with other 68RFE work
Sonnax billet input shaft:
- Most-failed shaft in tuned trucks
- Read our 68RFE billet input shaft
HD flexplate:
- For tuned trucks
- Read our 68RFE flexplate
Pressure control solenoid:
- Common 68RFE failure
- Read our 68RFE pressure control solenoid
HD direct clutch:
- More frictions for HD use
- Read our best 68RFE rebuild kit
Cost considerations
Bushing only:
- $20-80 in part
- Labor: included in rebuild
- Total: negligible cost in rebuild context
Cost of skipping:
- New bushing skipped: failure repeats
- Bore damage: case replacement
- Read our diesel tow rig setup
After rebuild verification
Pre-install check:
- Hand-rotate input shaft
- Should be smooth
- No binding
Post-install:
- Verify endplay
- Verify rotation smooth
- Pressure test if applicable
Read our transmission rebuild break-in
Year-by-year notes
2007-2010 68RFE:
- Original bushing material
- Replace at any rebuild
2011-2018 68RFE:
- Updated bushing in some applications
- Still replace at rebuild
- HD version recommended for tune
2019+ 68RFE:
- Latest bushing material
- Still standard rebuild item
Critical pairing: rebuild kit + bushing
Don't separate:
- Bushing should be in master kit
- If not, add it
- Verify master kit completeness
Quality master kits include:
- All seals
- All gaskets
- All thrust washers
- All bushings
- All small parts
Read our best 68RFE rebuild kit
Need 68RFE input bushing or rebuild parts? Shop our 68RFE catalog. Bushings, master rebuild kits, Sonnax HD upgrades. Free shipping over $70.
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