i think you have somethin confused. Stock birfields are 27 spline at the hub. The longs i have are just the chromoly birfield, and they are the 27 spline version so they will fit right in without having to replace the hub gears. When you buy a complete set of 30 spline longs you also have to buy 30 spline hub gears to use them. Also the ones i have are the older style so i dont know how strong they are compared to the new 27 spline longs.
Nope. YOU are confused.. STOCK= 30 spline at the hub, 27 spline at the birf and 30 spline at the diff.
27 spline longs are designed to fit onto your STOCK inners
![My Two Cents :twocents:](https://board.marlincrawler.com/Smileys/marlin/twocents.gif)
The reason for the "30 spline" chromos from longfield is to keep them "warrantied"
IFS hubs are 27 spline and Bobby also sells a hub gear to make IFS hubs compatable with birfs (30 spline)
If you dont believe me check it out, I just slid a hub onto the diff side of my long inner axle which is 30 spline and then I counted them to double check
![Beer Chug\'n :beerchug:](https://board.marlincrawler.com/Smileys/marlin/beerchug.gif)