Ferrari Steering Gearboxes

Earlier this year, a good customer drove to the shop in his 1967 Ferrari 330GTC for some service work and asked me to critique the way his car handles. We went for a spin and I immediately understood what he was talking about, when entering a curve it took lots of “input” in order navigate a corner and even go straight down the road. I use the word “navigate” because it handles like a boat.

We have had the suspension aligned and he had it aligned at his local shop a few times in an attempt to remedy this problem but it still steers super slowl. We compared it to a few other cars that day which validated our feelings, there was something wrong with his car.

Ferrari used ZF steering boxes in all of the cars from the mid 50′s through to the Daytona in the early 70′s.  A 1:20 ratio was chosen for the 330GTC but the 275GTB of the same year used a faster 1:17 ratio. My solution was to buy a brand new 1:17 worm gear to replace the 1:20 and see how it goes down the road.

The handling was transformed and it finally felt like a sports car. The 1:17 ratio was the perfect match for the car, even the steering effort at parking speed wasn’t compromised. I really don’t understand why the 330 got the slower steering but I have since changed the ratio in three other GTC’s. If you have a 330GTC or even a 330 GT 2+2, you’ve got to install this faster ratio steering box, you will love the transformation

Ferrari 330 Steering Box

330GTC Steering Gear Box

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4 Comments »

  1. lyle tanner said,

    September 30, 2015 @ 1:26 pm

    do you supply the parts for the steering box?
    330GT 2+2

  2. admin said,

    November 2, 2015 @ 2:14 pm

    I buy the worm gears from a vendor in Europe and have had good results.
    Otherwise, i don’t know where to go for other parts

  3. Clete Gardenhour said,

    February 7, 2019 @ 7:23 pm

    I have a 1967 330 GTC. It handles great but the steering is very heavy when parking or turning a slow corner. I have had the car for 10 years and the effort to turn is increasing. Your thoughts.
    Thanks, Clete

  4. admin said,

    February 8, 2019 @ 2:57 pm

    Hi Clete.

    Thank you for the message. If your car has the stock 20:1 ratio, it shouldn’t be too difficult to steer. However, most old Ferraris are a bit of a struggle compared to other cars. I have found that the correct sized Michelin XWX’s make a huge difference in feel. If you have 205-70-14, that is a 308/Dino tire. You need the 205-14 which is a taller tire, an 80 series. This makes a massive difference. Also, just make sure the basics are there, proper alignment, grease in the steering box and the steering shaft U-Joints are clean and greased.

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