SpeedFactory AWD 1310 U-Joint Billet Flange Adaptor Kit

SpeedFactory Racing Honda AWD Billet Flange Adaptor Kit - Part #SF-05-510

Every Honda AWD conversion on a CR-V or Wagovan driveline eventually runs into the same wall: the factory Wagovan driveshaft U-joints. They were sized for a 90 horsepower wagon, and they let go the first time a turbo B18 or K24 launches on a sticky tire. The SpeedFactory Racing Honda AWD Billet Flange Adaptor Kit is the piece that lets you bolt proper 1310 series U-joint yokes to the Wagovan viscous coupler and rear differential flanges so the rest of the driveshaft can be built with real parts.

What It Is and Why It Works

The Wagovan viscous coupler and rear diff have their own small bolt-pattern flanges, and nothing off the shelf in the 1310 world bolts to them. These two billet adaptors sandwich between those flanges and a standard Spicer 2-2-329 PTO flange yoke, centering the yoke on the factory flange and giving the whole rear section a 1310 joint at each end. A 1310 is the same size joint you'd find under a small block Chevy pickup, which is a different universe from the stock Wagovan joint.

The kit is the two adaptors and the hardware to mount them. That's it, and that's on purpose. SpeedFactory designed these to work with a specific set of Spicer and Neapco components: a flange yoke at the transfer case, a tube yoke sleeved into the front Wagovan tube, and two tube yokes welded into a new 2.5 inch by .083 wall DOM rear tube with a 1310 joint at each end. A driveshaft shop does the welding and balancing. If you'd rather not source every piece yourself, SpeedFactory's SF-05-531-KIT bundles these adaptors with all of the yokes and U-joints.

Specs

Fitment

Fits the rear driveshaft section of any Honda AWD conversion that uses the Civic Wagovan (RT4WD) viscous coupler and rear differential. The adaptors are chassis-independent; what matters is that you are running the Wagovan rear driveline.

What to Know Before You Buy

This kit does not replace anything by itself. You still need three 1310 U-joints, the flange and tube yokes, a section of driveshaft tube, and a driveshaft shop to weld and balance it. Order the SF-05-531-KIT if you want every part in one box, or buy this adaptor kit alone if you already have a source for the Spicer yokes. Either way, hand the shop the whole set of parts at once so they can build it in one pass.

These adaptors go on the rear section only, between the viscous coupler and the driveshaft and between the driveshaft and the rear diff. The front connection at the B-series or K-series transfer case uses a flange yoke that bolts directly to the transfer case output flange and doesn't need an adaptor. Use non-greaseable 1310 joints; SpeedFactory specifies them because the solid cross is stronger than the drilled greaseable version. While the driveline is out, look hard at the viscous coupler itself. Most Wagovan units are 30 years old and tired, and a fresh driveshaft won't fix a coupler that's already done.