Re: Severe diff noise

Posted by Fred Puhn On 2012/5/20 22:49:39

My 1950 Series 23 Touring Sedan uses a 3.9 ring and pinion. This car is automatic (no overdrive). The ratio is nearly ideal. I can cruise at 60-65 mph with no strain. The hill climbing is fine. With a 4.1 ratio the engine would be turning 5% higher rpm on the freeway.