One of the problems is the famously weak MA gearbox.
It was making an ominous knocking noise in reverse (as if a tooth was missing) but it was fine in every other gear, with no other noises.
These are an easy box to work on, so just for you, I thought I would give you a step-by-step stripdown.
Firstly, drain the oil & thoroughly clean the outside to keep the work as contamination free as poss. Cleanliness next to Godliness and all that!


Starting with a clean work surface covered in clean news paper, remove the 3 bolts holding on the end cover.

Then remove the 2 clips on the end of the 2 gear shafts using circlip pliers. You will replace these with new so don't worry about damaging them.

Next knock out the "roll" pin that holds the selector fork to the shaft. Then carefully pull off the complete selector and gear assembly. Be careful of the selector as there are a few small bits inside that will fly everywhere if you don't take it off as a complete unit

You will need a puller to get the other gear off as it is a press fit.

So you should end up with a collection of parts like this.

CONT...................................







...............























