MrBrumbyboy

Hi theres, I did I site search with no help coming up, so I thought id try here: I own a 91 brumby which has the ea81 and 4 speed in it, diff ratio is 3.7, I am wanting to swap that engine and box out and fit a rebuilt ea81 and a 5 speed my friend has a spare ea81 and 5 speed box he said came out an early 80's model brumby (all the info he had) my question is does anyone know what box this is attached to his engine as I cant find any info and want to match the ratios (on side of gearbox is stamped : FM-4 and written on a foil sticker : 805067 any help what car the box is out of or what ratios it has would be very helpful thanks