A driveshaft must be able to slide in/out when the wheel is moving up/down. The matra cv joint at the wheelside is able to slide in/out. There is a spring in that joint, and a fixed boss in the other joint (dif side) The spring is to make sure the shaft stays in the same position in the dif side joint, while the wheel side joint is moving in/out. (That's why the wheel side joint is longer than the dif side joint.)
Peugeot and my toyota drive shafts are the other way around. They have the fixed side at the wheel, and the moving side at the dif.
When making a new drive shaft by fusing a matra outer joint to a peugeot inner joint will give a problem. You will end up with springs in both ends.
The problem is that the shaft's position can be all over the place.
The way to solve this is to make a fixed boss in one of the joints.
I did it by making a piece of nylon in the peugeot joint. (thanks Lennartfor the advice)
And the same thing in the toyota joint, but this time i used the matra boss.
The way i set the lenght of the peutra shafts:
When the wheel is at the same level as the dif, (drive shaft horizontal) The spring loaded joint was sitting in the middle of the slots.
A better method is to look at an original matra and see/measure the position of the joint.
But make sure the driveshafts are in line! Don't do it as i did. I end op with the peugeot engine in the wrong postition, and the drive shafts were not in line. Making knacking noises when i go around the bend.
When i did the mazyota conversion i played safe. I position the engine in such way that the dif was in exactly the same place as were the original dif was. That way i also could copy the lenght of the original drive shafts.
Have a look here:
http://www.maztra.nl/C1900_inb_1.htmlhttp://www.maztra.nl/inbouw_Eng_2.html