9" rear in a jailbar truck

[GB SISSON]

Originally Posted by cas3

Sorry I don't have a specific answer, but yes I know there is a small bottle of special additive to use to make the clutch pac happy. Google 9" ford, there are several places that specialize in 9"ers and I would bet the answer is there

Thanks Skip. Yes I've been doing my research and see numerous explanations of how it all works. No or not enough friction modifiers in a limited slip axle causes clutch chatter and vibrations, especially in low speed, low torque cornering. For instance a little old man steering his homemade wooden car into a gas station. The friction modifier, (us limited slip guys just call them 'FM's) actually reduce the friction in the clutch packs so the clutches slip smoothly while going around corners. I am confident this is what I'm hearing and feeling on those sharp corners.
Shortening up the parking brake cables was the last difficult task, and I made it more so by having the cable installed into the backing plate with it's ball end in the fork already. This was to assure correct length. All the cable work was done with the clevis/threaded end vice gripped onto the running boards, which I will say, Did make an excellent workbench.