In my ‘Final Drives Matter‘ discussion I investigated the massive difference that a higher final drive ratio would make to the acceleration at the expense of Vmax (down to 140mph!). In that I concluded that the original diff (an Automatic Torque Bias one) would have to be replaced and at almost £1000 with an almost identical one but with a different offset to cater for the different sized crown wheel. It just wasn’t financially viable. Disappointing as it was, I’d enjoy the benefits of the existing diff albeit with a slower accelerating car.
Enter the Unicorn. A crown wheel offset spacer and extended bolts to mate the existing lower ratio diff to a higher ratio final drive.
From the racingdiffs.com website
“This distance plate is required if you want to swap a low gear ratio LSD carrier for a high gear ratio.
There is a difference in crown ring position between low gear ratio carrier units (2.64 to 3.07) and high gear ratio units (3.15 to 4.45). This spacer allows a smooth transition from low to high gear ratios without any machining.
It is much easier to source used Limited Slip Differentials than TDS models. However, the resulting very low gear ratio – 2.64 is a problem. But, now the RacingDiffs spacer enables you to combine gear ratios from 3.15 to 4.45 with the existing/used LSD carrier unit.
This package includes:
– 1 x spacer
– 10 x high quality crown ring bolts.
The spacer is made with the CNC precision from the high quality tool steel, thermally processed for high durability and hardness.“