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Figure 1
Input shaft of 904
(non-lockup style)
Figure 2
Input shaft of 904 (lockup style)
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The 904 (non-lockup style) was built from 1960-1977. Notice
how the splines go to the end of the shaft (see Fig. 1
on left). The 904, nonlock-up style, is preferred for
performance building.
The 904 (lockup style) was built from 1978-1993. This style
uses a torque converter with an internal clutch. Notice the
machined area where the clutch inside the converter will seal
(see Fig. 2 on left).
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