Created late 1980s to initially fit their own rc10 chain drive tranny, that really had no diff adjustment, Team Pit Stop soon after released them to fit the Losi JRX2........
.......while AE had a ball bearing slipper of sorts that was their only diff adjustment, that didn't really work, both Losi and Kyosho attached their spur gears straight to the top shaft and had a proper diff mounted low in the tranny.
While this design, still used today, allowed better adjustments it was hard to fine-tune at trackside.
Team Pit Stop's Slipper Clutch cured that, it had little delrin pegs you inserted in the bearing holes in the spur gear. And while the Losi and AE cars had been pretty equal to that point, the slipper clutch gave the Losi drivers a huge advantage and forced associated to do a complete redesign of their car from front to back.
The design was soon after copied by AE on their stealth tranny - and now most slippers use delrin rings on the spur gear instead of pegs - but now literally every car on the market today has a slipper in some sense or another than can trace it's heritage back to the original TPS model.
