Is a 1988 Johnson 9.9 outboard with a serial j10rccd a short shaft?

The 1988 Johnson 9.9 outboard model with the serial number J10RCCD is indeed a short shaft model. Typically, short shaft outboards have a shaft length of about 15 inches, while long shaft models are around 20 inches. You can confirm this by measuring the distance from the mounting bracket to the anti-cavitation plate.