1976 2l Kombi Gearbox Ratios

In the gregories manual it says that the 4th gear ratios are 0.82:1 or 0.88:1 or 0.89:1. How do I know which ratio the 4th gear is in my 2L 1976 gearbox?
And is the 2L gearbox stronger than the 1967 kombi gearbox with a trushift 5 speed mechanism?
Any ideas?

the 67 kombi gbox is totally different from the 2 ltr kombi gbox as the 67 is a split window kombi and the 2 ltr a bay window kombi as for ratios I thought the kombi's had the .82 4 th gear check out this site

http://www.geocities.com/Baja/Dunes/9702/transtalk.html
marcel