906256-4 – Short Couple Driveshaft – 1610 (1.875 x 5.312) Series – 6.120″ Cl To Cl – — Flange To Flange

906256-4 Short Couple Driveshaft — 1610 Series, 6.120" CL to CL

The 906256-4 is a 1610 Series short-couple driveshaft assembly with a centerline-to-centerline U-joint dimension of 6.120". The flange-to-flange installed dimension is not specified for this part, consistent with the 906256 family convention where selection is based on CL-to-CL measurement. The 1610 Series uses 1.875" cap diameter U-joints with a 5.312" cross width. This assembly is designed for medium and heavy-duty commercial vehicle interaxle and flanged short-couple applications in the Class 6–7 range. Factory balanced prior to shipment.

The 906256-4 CL-to-CL of 6.120" corresponds to the same cross spacing found in the 906224-4 (9.880" F-to-F), but the 906256 family is defined and selected by CL-to-CL rather than F-to-F. This distinction arises when the vehicle installation specifies U-joint cross positioning rather than flange face distance — applicable when the mating hardware uses variable-depth flanges or when the technician measures the old shaft by cross centerlines. The 906256-4 at 6.120" is longer than the 906256-1 (5.380" CL-to-CL) by 0.740".

Specifications

• Part Number: 906256-4
• Series: 1610 (1.875" cap x 5.312" width)
• CL to CL: 6.120"
• Flange to Flange: Not specified
• Application: Medium/heavy-duty commercial truck, interaxle shaft, flanged short-couple application

Fitment & Installation Notes

To select the 906256-4, measure the CL-to-CL distance between the two U-joint positions in the vehicle — either by measuring the removed shaft or by measuring from cross center to cross center in the chassis with the companion flanges in position. If F-to-F is known instead of CL-to-CL, cross-reference to the 906224 family which is defined by F-to-F. The 1610 Series companion flange bolt circle, pilot diameter, and bolt specification must be confirmed from the axle OEM service documentation. Do not substitute 1710 Series components — cap diameter mismatch will cause immediate failure.

The 1610 Series is catalogued for Class 6 trucks and medium-duty vocational applications where the driveline torque demand falls within this series rating. The 1.875" U-joint cap and 5.312" cross width are the defining 1610 dimensions — these are smaller than the 1710 Series (1.938" and 6.094") and larger than the 1480 Series (1.375" and 4.188"). Short-couple assemblies in this series are non-telescoping and non-adjustable; the 6.120" CL-to-CL is a fixed dimension that must match the vehicle requirement.

The 906256-4 is the longer of the two 906256 1610 Series variants. Both variants (906256-4 and 906256-1) use the same 1610 Series U-joint and flange yoke design — the CL-to-CL is the only differentiating dimension. Confirm the 6.120" CL-to-CL against the vehicle measurement before ordering the 906256-4. Explore related Short Couple Driveshaft assemblies including the 906256-1 at 5.380" CL-to-CL, the flanged 906224 family, and 814119-1S for longer 1610 Series interaxle applications.