LT77 help

Hi, I'm new to the forum and already need some advice.

I have a RV8 and LT77 box with remote , and I'm trying to tie down the specifics of the box. I think it came from a SD1 origionally

The ID number has a suffix which I can't find on any of the lookup sites: its CL-xxxxxx-C (xx .. being the serial no)

I m trying to find the ratios and spec, can anyone point a newbee in the right direction

Cheers. Silverback