906020-1 – Short Couple Driveshaft – 1710 (1.938 x 6.094) Series – 6.620″ Cl To Cl – — Flange To Flange

906020-1 Short Couple Driveshaft — 1710 Series, 6.620" CL to CL

The 906020-1 is a 1710 Series short-couple driveshaft assembly with a centerline-to-centerline U-joint distance of 6.620". The flange-to-flange dimension is not specified for this part, consistent with the 906020 family convention where CL-to-CL is the defining selection criterion. The 1710 Series U-joint carries a 1.938" cap diameter and a 6.094" cross width, providing the torque rating required for Class 7–8 heavy commercial vehicle interaxle and short-coupled driveshaft applications. Factory balanced prior to shipment.

The 906020-1 at 6.620" CL-to-CL is the shorter variant compared to the 906020-4 (7.380" CL-to-CL). The 0.760" difference in CL-to-CL between these two variants is a consistent step size seen across the 1710 Series short-couple families, reflecting the incremental sizing used to match different tandem axle spacing configurations. When the -1 variant's 6.620" CL-to-CL matches the vehicle measurement, the -4 at 7.380" does not — selecting the wrong variant places the U-joint crosses off-center relative to the companion flange mounting points, affecting operating angle and vibration characteristics.

Specifications

• Part Number: 906020-1
• Series: 1710 (1.938" cap x 6.094" width)
• CL to CL: 6.620"
• Flange to Flange: Not specified
• Application: Heavy-duty commercial truck, interaxle shaft, short-couple flanged application

Fitment & Installation Notes

To confirm the 906020-1 is the correct assembly for a given installation, measure the CL-to-CL distance between U-joint positions in the vehicle. If the old shaft is available, measure its CL-to-CL directly and compare to the 6.620" specification. The 1710 Series companion flange bolt circle, pilot diameter, and bolt count must match the flanges at both the driving and driven ends of the installation — consult the axle OEM service manual. A 1710 Series U-joint cannot be substituted with a 1610 Series component; the 1.938" bore in the 1710 yoke ears will not retain 1.875" 1610 Series caps securely.

The 906020-1 is appropriate for tightly-spaced tandem axle configurations in Class 7–8 trucks where the CL-to-CL falls at 6.620". The 1710 Series has sufficient torque capacity for severe-duty vocational applications including aggregate, refuse, construction, and off-highway vehicles operating at rated GVW. Short-couple assemblies in this series are non-adjustable — the installed CL-to-CL must match the chassis specification. Factory balancing ensures the assembly complies with commercial vehicle NVH standards at operating speed.

The 906020-1 is the shorter of the two 906020 family variants in the 1710 Series catalog. Both variants (906020-1 and 906020-4) use identical U-joint and flange yoke specifications — length is the only differentiating factor. Verify the 6.620" CL-to-CL against the vehicle specification before ordering the 906020-1. Explore related Short Couple Driveshaft assemblies including the 906020-4 at 7.380" CL-to-CL and the flanged 904657 family for applications specified by flange-to-flange dimension.