The C4,AOD, & T5 trans all have have 28 splines with a 1 1/2 seal dia. Some of these yoke took a 1310 u-joint and some a 1330, my driveshaft uses a 1330 u-joint and my yoke is the same it's just that my slip yoke has had it ad needs to be replaced, so to keep things simple I'd to use a 1330 u-joint in the front which is the same as the rear.