The Ford C6 is the legendary 3-speed HD automatic from 1966-1996. Still the choice for diesel swaps, muscle car restos, and HD truck builds. Here is the full rebuild guide.
Get the parts for this repair
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C6 history and applications
- 1966-1996 (30-year production run)
- 3-speed automatic, no overdrive
- Used in: F-Series, Bronco, E-Series, Mustang, Cougar
- ~450-550 ft-lb stock rating
- Goes to 1000+ ft-lb with HD parts
Why the C6 is still popular
Bulletproof reputation:
- Simple design
- Plenty of room for HD parts
- Easy to rebuild (no electronics)
Cheap parts:
- 30+ years of production
- Massive aftermarket support
- Used cores under $200
Hydraulic only:
- No PCM required
- Perfect for engine swaps
- Great for carb or simple EFI
Common C6 failures
Reverse band:
- Burned reverse band
- Loss of reverse
- Cheap to replace ($30-$60)
Forward clutch:
- Slip in forward gears
- Burnt fluid
- Stock 5-disc OK, HD wants 6
Direct clutch:
- Slip in 3rd gear
- Burnt fluid
Pump bushing wear:
- Front leak
- Pump whine
- Cheap fix during rebuild
Rebuild kit options
Basic rebuild kit:
- All clutches + steels
- Gasket and seal kit
- Sealing rings
- $100-$200 kit
Master rebuild kit:
- Basic + filter
- + pump bushing
- + thrust washers
- $200-$350 kit
HD rebuild kit:
- Master + Raybestos HD frictions
- HD direct clutches
- HD reverse band (Kevlar)
- $350-$600 kit
HD upgrade parts
For diesel/HD truck:
- HD billet input shaft: $300-$500
- HD forward clutch pack: $80-$160
- Reverse band (Kevlar): $50-$100
- Servo upgrade kit: $80-$150
- HD pump body: $200-$400
For drag race:
- Manual valve body: $400-$700
- Trans brake: $300-$500 add-on
- HD billet drum: $400-$700
- Aluminum case: $1,200-$2,200
Install
- Trans must come out
- 4-6 hours for R&R alone
- Teardown: 4-6 hours
- Assembly: 6-8 hours
- Total: 14-20 hours skilled labor
Cost
DIY basic rebuild:
- Master kit: $200-$350
- Converter (rebuilt): $150-$300
- Fluid (Mercon, 12 qts): $80-$140
- Total: $430-$790
DIY HD rebuild:
- HD kit: $350-$600
- HD converter: $300-$700
- Fluid: $80-$140
- Total: $730-$1,440
Shop rebuild:
- Parts: $430-$1,440
- Labor: $700-$1,400
- Total: $1,130-$2,840
C6 vs E4OD vs 4R100
C6:
- 3-speed, no OD
- Bulletproof, simple
- Best for resto / drag
E4OD/4R100:
- 4-speed with overdrive
- Electronic control
- Better for daily / towing
- Modern truck swap target
When to keep the C6
- Muscle car resto-mod
- Drag race truck
- Simple carb engine swap
- HD short-trip use (no OD needed)
When to swap to E4OD/4R100
- Daily driver
- Highway commute (need OD)
- Modern EFI swap
Need Ford C6 rebuild kit, HD parts, or torque converter? Shop our C6 catalog. Master rebuild kits, HD billet shafts, HD converters. Free shipping over $70.
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