Fast Ratio Corvair Steering Boxes

New Fast Ratio Steering  gearboxes are now available to fit all Corvair cars. The box duplicates the 16:1 steering ratio used in the original GM Production Option Quick-steering box. We performed some of the early testing on the box, designing adapters to allow it to fit any model of the Corvair car. It does not fit FCs. The box is a physical duplicate of the early 1960-63 short-shaft Corvair box, in steel. The box is $480 + $25 shipping and insurance. (In California, add $38 tax) In 2017, Flaming River discontinued production of their quick box. Two years ago we brought out a new Standard ratio 20:1 box for the Corvair. Those Standard ratio boxes are still available. $320 + $25 shipping/insurance. Either box is a bolt-in for the 60-63 cars. Kits to fit either box into 64 or later years of Corvair are available, starting at $95. Drop an e-mail request to "" for more information.



This shows the new box installed in a 1965 Corvair. The 1964, 1965 and 1966 cars used a longer input shaft than either the earlier or later boxes. When the box is installed in 1965 or 66 cars, the set screws and nuts for the adapter U-joint end up very close to the frame rail and the trunk panel. Swapping out the set screws for slightly shorter ones usually works. If not, it is hammer time! There is a specific kit for the 64 or early-65 cars. Late-65 - 1966 requires a different kit.

1964 or 1965 adapters are $95. 1966 collapsible kit $210



The small spline to the left is the input shaft. The 1960-63 coupler will slip right onto this spline. The input spline is a 5/8" x 36. The the 1967-69 Corvair input spline is similar, but has a flat ground on one side of the splines to maintain steering wheel alignment after removal. To install the box into a 1967, the flat must be ground on the input splines. You should center the old box, center the new box, then grind the spline in the same relative location. You can alway re-align the actual steering wheel for correct clocking. You will have to move your pitman arm over from the old box. Use a puller, or have a machine shop pull it off. It may be tough to remove - after 50 years. The splines on the output side have four "dead" splines that limit the number of ways the pitman arm can be installed. Again center the old box, center the new box and install the pitman arm in the same direction.

Contact Us:

Performance Corvairs

Seth Emerson
3462 Kirkwood Dr.

San Jose, CA 95117

Phone: (408) 247-2237


We Race What we Sell


Racecar shown at Thunderhill Raceway in Willows, CA.

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