Ferrari axle

After overhauling nearly every part on the yellow GTE and driving it for 1500 miles, the rear axle started making some ugly noises. Unfortunately, the bearing wear allowed the pinion shaft to walk back and forth which damaged the ring and pinion gears.¬† Ferrari 250′s are notorious for having a low final drive ratio so since we had to replace the R&P, we decided to change from a 7-32 to a 8-34 so when the car is up and running I will report on the how the characteristics of the car change. A friend of mine with a 400 5-speed put a rear axle center section from a 400 Automatic in his car only to find that the car felt sluggish and less than athletic. Going from a manual to automatic rear axle ratio is drastic where we are only changing the ratio in this project slightly, from 4.57:1 to a 4.25:1. I would imagine that the ratio from an automatic would be something in the range of 3.5:1 versus a 4.11:1 with a 5-speed.

Just as I do with all of the early Ferrari axles we get in, this one will be converted to use a much more robust bearing assembly to make sure the expensive gears and other parts won’t be destroyed prematurely as this one has done. I’ve commented on this¬† before and I will note again that we don’t see axle failure on other cars such as Jaguar or Maseratis unless they are operated for an extended period of time without oil. With the Ferraris, we see catastrophic failure due to a cruddy design regardless of lubrication!

GT 250 Ferrari Axle

GT 250 Ferrari Axle

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1 Comment »

  1. DTA said,

    March 21, 2011 @ 1:37 pm

    The vibration really compromised the driving experience. ‘Be interesting to see how the new ratio affects the off-the-line feeling.

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