* Powerglide (2-speed automatic): The dipstick and fill point are usually located on the driver's side of the transmission, near the back. It's often a separate dipstick tube rather than a combined dipstick/filler tube. Look for a small tube with a dipstick attached.
* Turbo Hydra-Matic (3-speed or 4-speed automatic - TH350 or TH400): The location varies slightly depending on the exact transmission and if there are any aftermarket modifications, but it's generally located on the passenger side of the transmission, often near the back. Again, it may have a separate dipstick and fill tube, or it might be combined. Sometimes, the fill tube will be slightly higher than the dipstick.
* Manual Transmission: Manual transmissions on a '66 Impala generally don't have a dipstick; the transmission is filled through a separate fill plug, often on the side or top of the transmission case. Consult a repair manual for the correct location and procedure.
To find the correct location for *your* 1966 Impala:
1. Identify your transmission type: Check your vehicle's documentation or look for markings on the transmission case itself.
2. Consult a repair manual specific to your 1966 Chevrolet Impala: A Haynes or Chilton manual will have diagrams and instructions clearly showing the transmission fluid dipstick and fill locations for each transmission type. This is the best and safest method.
3. Look carefully: Once you know the transmission type, examine the transmission itself. Look for tubes or plugs that might be dipsticks or fill points.
Caution: Adding the wrong type of transmission fluid or overfilling can severely damage your transmission. Always refer to your owner's manual or a repair manual for the correct type and amount of fluid. If unsure, consult a qualified mechanic.
