The ZF 4 speed auto box on my 1986 rangie seems to short shift through all gears until in 4th!! Its worse from first to second and then again seems to short shift from 3rd to 4th!! Can it be adjusted in any way like it can on my merc 190 via the bowden cable?

Also how easy is it to change the oil as its a tad brown at the mo

And should the shifter gate light up??

Cheers,
Stu