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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  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. Torsten Walsdorff said,

    June 26, 2016 @ 7:27 am

    Hi, i have a 330GTC in my shop at the moment with slightly damaged Steering worm and Pivot, and i would like to transfer to the 275 parts like you did. I am located in Bavaria,Germany, the parts you used for the transversion, did they came from GTO Engineering in the UK? or would you be so kind and let me know the distributor if it´s not GTO? Thanks a lot! Greetings and best wishes! Torsten

  4. admin said,

    September 9, 2016 @ 6:30 am

    Dear Torsten

    I have had good success with replacing these with faster ratio units. Please email me at RPM@RPMVT.COM and we can talk

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