Re: How to tell if a 55 has overdrive?

Posted by Owen_Dyneto On 2022/8/28 16:06:11

Ultramatic equipped cars generally were equipped with a 3.54 rear ratio, but 3.23 and 3.07 were available. Standard transmission cars typically had the 3.90 ratio. Seldom seen but in 1956 a 2.87 was also offered with Ultramatic.

The listing of standard and optional ratios are in the specifications which are published in the 1955 Service Counselors.