Driveshaft from an Apex is different, will not work in a Nytro. You could have those 2.86 drivers pressed onto your stock Nytro driveshaft if you wanted though. The total diameter of 8 tooth 2.86 drivers vs 9 tooth 2.52 drivers should be pretty close, clutching and gearing shouldn’t act much different then when it was stock. I’m just finishing up a 137” Mono II install into my ‘13 Nytro project sled, can’t wait to try it.