Just a note: I helped a friend get his Goblin going. Every thing looked good and buttoned up nice. He took it out to shake it down more and something went sort of bang/pop and no more forward motion. I had left town and was helping him by posts. On jack stands the engine would turn the passenger side wheel a little. Then he saw it was dripping trans fluid. Preparing for the worst we began searching for an F35.
Then he took a good look at the L half shaft into the diff. The left side was pushed out of the diff! The very end of that axle had the splines on the button end chewed off. Either the clip did not hold the axle in the spider gear or we had failed to fully seat the axle in the diff.(I think we failed to seat the axle, a long day and being unfamiliar with all of these components.) Saints be praised, a new pair of axles(he did not want to replace just one, as both were from his donor and leaking just a little) and this time he made sure they were both completely inserted into the diff! All Better Now!
Sometimes it’s the simple stuff!