904657-1 – Short Couple Driveshaft – 1710 (1.938 x 6.094) Series – 10.620″ Flange To Flange

904657-1 Short Couple Driveshaft — 1710 Series, 10.620" Flange to Flange, 6.620" CL to CL

The 904657-1 is the shortest variant in the flanged 904657 family of 1710 Series short-couple driveshafts, with a flange-to-flange dimension of 10.620" and a centerline-to-centerline U-joint distance of 6.620". The 1710 Series uses 1.938" cap diameter U-joints at 6.094" cross width, providing the torque capacity required for Class 7–8 tandem-drive commercial trucks. This assembly is used as an interaxle shaft where the companion flange gap in the chassis measures 10.620". Factory balanced prior to shipment.

The 904657-1 at 10.620" F-to-F and 6.620" CL-to-CL shares its CL-to-CL with the 904657-9 (12.620" F-to-F) and 904657-5 (11.620" F-to-F), which means the U-joint cross-to-cross spacing is identical across these three variants while the overall installed length differs. The flange-to-flange dimension is the variable being stepped — the yoke body depths are the same, and only the assembled shaft length between them changes. This makes the F-to-F measurement the single most critical dimension when ordering this assembly.

Specifications

• Part Number: 904657-1
• Series: 1710 (1.938" cap x 6.094" width)
• Flange to Flange: 10.620"
• CL to CL: 6.620"
• Application: Heavy-duty commercial truck tandem axle, interaxle shaft

Fitment & Installation Notes

Measure the flange-to-flange gap between companion flanges in the vehicle before ordering the 904657-1. At 10.620", this is the shortest flanged variant in the 904657 family — if the chassis gap is longer than 10.620", select the appropriate longer variant (904657-4, -5, -8, -9, or -12). The 1710 Series companion flanges must match the bolt circle, pilot diameter, and bolt diameter specified by the axle manufacturer. The no-slip construction of this short-couple assembly requires that the chassis gap remain constant at the nominal value throughout the operating duty cycle.

In tandem-axle truck applications, the interaxle distance (and therefore the required shaft F-to-F dimension) is determined by the axle spread — typically 40", 52", or 54" on Class 7–8 trucks. The 10.620" F-to-F of the 904657-1 corresponds to tightly-spaced tandem axle configurations. Short-couple interaxle shafts do not accommodate suspension travel the way a conventional driveshaft does — the flanged connection at both ends is rigid. Operating angle is set by axle alignment and cannot be adjusted by varying shaft length.

The 904657-1 is the entry-length variant of the 904657 1710 Series family. All variants in this family use identical 1710 Series U-joints and flange yoke design. Select by measuring the chassis flange-to-flange gap and ordering the variant whose F-to-F dimension matches within the assembly installation tolerance. Explore related Short Couple Driveshaft assemblies including longer 904657 variants and the 906020 1710 Series CL-to-CL-defined family for additional tandem axle shaft options.