Thanks for the info.
I"m not sure that I can rely only on the Green Bible since I dont have an original rear prop. It was rebuilt using the same tubes, but I made a (huge) newbee mistake when measuring the necessary lenght (please, just don't ask... its hurts enough already...).
What would be the (average) distance between the 2 tubes when the truck is on level ground ? I guess that would be a good way of measuring the lenght of the prop since you need an "ideal" distance to that the prop can slide back and forth.
Thanks.
Note : I don"t intend to go off-roading like hell (chassis too old), so I guess an approximation is going to be ok. Please state otherwise if I'm wrong.