904657-8 – Short Couple Driveshaft – 1710 (1.938 x 6.094) Series – 12.380″ Flange To Flange

904657-8 1710 Series Short Couple Driveshaft 12.380" Flange to Flange

The 904657-8 is a 1710 series short couple driveshaft measuring 12.380" flange-to-flange and 7.380" centerline-to-centerline. Compared to the 904657-9 at 12.620" F-to-F with a 6.620" CL-to-CL, the 904657-8 carries the same 7.380" CL-to-CL as the 904657-12, indicating a different flange yoke depth at one or both ends.

Specifications

• Part Number: 904657-8
• Series: 1710 (1.938" x 6.094")
• Flange to Flange: 12.380"
• CL to CL: 7.380"

When fitting the 904657-8, measure the actual installed flange-to-flange gap and confirm it matches 12.380" before ordering. The 5.000" difference between F-to-F and CL-to-CL reflects the combined flange yoke CJ-to-flat dimensions at both ends. Confirm both mating flanges are machined for 1710 series U-joint cap bores.

The 1710 series uses 1.938" cap diameter trunnions — dimensionally incompatible with 1610 (1.875") or 1480 (1.375") series. Install 1710-rated U-joints at both ends of the 904657-8. Substituting a lower-series joint will result in bearing cup misfit and joint failure under load.