Echometer Model D Manual Transmission
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There are many different variations of the Borg Warner T10 four-speed manual transmission, because from 1957 to 1987, every American vehicle manufacturer has used the T10. The T10 is a reliable transmission that continues to be used in a variety of restoration and replacement applications. The two major classes of the T10 are the early cast-iron unit and the aluminum-cast Super-T10 - all of which can have different gear ratios. Basic identification is simple.
Echometer Model D Manual Transmission Control

However, determining the different gear ratios of the T10 requires the transmission to be off the vehicle. Count the cross-grooves on the input shaft. The input shaft enters the engine at the front of the transmission. Since there are many gear-ratio variations of the T10, there are identifying grooves cut across the clutch spine of the input shaft. According to Drivetrain.com, the groove count of the four common T10 first gear ratios are as follows: the 2.43 first gear ratio has two grooves, the 2.64 first gear has three, the 3.42 has five and the 2.88 first gear ratio has six. The gear ratios ultimately identify the T10 in question.