03-06-2020, 01:33 PM
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Senior Member
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Join Date: Mar 2017
Location: ABQ, New Mexico
Posts: 36,633
Thanks: 3,506
Thanked 136,573 Times in 22,784 Posts
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One of the most exotic options ever offered on a muscle car: Olds's 1970 W27 Aluminum Differential. Introduced on 10/10/69 for $157.98 you got some very real benefits:
1. 22 pounds lighter than a cast iron rear - improved handing due to less unsprung weight
2. The aluminum fins on the cover reduced differential temperature by 20 degrees.
3. Held an additional pint of gear oil over a conventional axle.
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