Lazarus-F150

I need to change the shifter bushings and the transmission fluid on my 1992 4x4 (4.9L, 6 cyl) and I can't seem to figure out which model of manual transmission I have. Its got four standard drive gears plus O/D. Does that make it the M5OD? Sorry if this sounds like a stupid question.... Hopefully I'm not the only one that can't figure this out.

Thanks