Ok, great advice… The front diff is original. So i can maybe keep every thing original and install the spiral gear for futur project.If you switch to the spiral cut gear set make sure you switch out both front and rear at the same time. The Senton has straight cut teeth on both the 13t diff pinion and the 43t crown gear. The spiral gear set drops down to a 10t diff pinion and 43t crown gear. You can still run the lower geared spiral set, but to keep the same overall gearing you'll need to add a motor pinion with 4 more teeth to make up the difference
For that input cup set screw, use heat to break the thread lock.. Heat it with a soldering iron for 30-60 seconds, then try it.
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