MUSCLE CAR/HOT ROD/RACING 2-WHEEL DRIVE 2/3 - SPEED AUTOMATIC Automatic 3-Speed C-6 14" Tailhousing. Replaces 14" tailhousing. 60's - 70's muscle cars and street rods. Install price - $750.00* *Typical install & drive shaft modifications. Does not include any modifications to exhaust, transmission tunnel or any other custom modifications that may be required.