Companion Flanges
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Image | Add | Part Number | Splines count | Splines dia / Bore Dia | Hub Dia | Through hole | Pilot dia | Bolt Holes | Face To End | Keyway | Bolt Circle Dia | Outside Dia | Brand | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 30 | 1.250 | 1.848 | 1.000 | 0 | 3/86 mm bolt to bolt | 2.200 | 100mm | Pinion Tri-Flange V6 12/18 Bolt hole | |||||
 | 31 | 1.380 | 1.890 | 2.000 | 2.000 | 4 / 0.500 | 2.500 | 4.25 | SQ Pattern, Counter Bore .25 , Borg Warner TC 1356 | |||||
 | 2.820 | 5.000 | 12 | 4.250 | Caravan adapter for 3194-100 CVJ |
Category Information
The companion flange is the interface between the driveshaft and the differential pinion shaft, and its condition has a direct impact on the health of the entire rear drivetrain. A companion flange with worn pilot bore, damaged bolt holes, or a scored seal surface creates problems that cascade — runout at this joint feeds directly into U-joint wear, and a leaking pinion seal due to a damaged flange surface is a contamination risk for the entire differential. Our companion flanges are machined to maintain correct pinion shaft fitment, true bolt circle geometry, and a clean seal surface that allows the pinion seal to do its job. Available for common rear axle applications in both OEM-replacement and upgraded configurations.
