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Hub End Play Gauge Instructions:
- Adjust bearing spacer until bearing end play can be felt by pushing and pulling on hub. Bearings should be clean (no grease) and the seal removed. Torque spindle nut to 20 ft lbs.
- Thread End Play Gauge Mandrel onto spindle, tighten by hand.
- Slide Dial Indicator Arm onto Mandrel Shaft until indicator base is touching the outer hub lip. This is the area of the hub where the dust cap or drive flange is typically installed. Adjust Dial Indicator location as necessary.
- Zero Dial Indicator.
- Push and Pull on hub while reading Dial Indicator. Note total end play.
- Remove bearing spacer and adjust spacer shorter until the desired end play or preload is obtained.
Example #1: If total end play measured in step 5 is .007” and the desired pre-load is .001”, adjust the spacer .008” shorter.
Example #2: If total end play in step 5 is .007” and the desired preload is .000”, adjust the spacer .007” shorter.
Repeat process as necessary.
- For best results, adjust spacer until .001” end play is measured, then shorten spacer to achieve “0” end play or desired preload.
- When measuring front hubs on the vehicle, you may get an “end play” feeling due to the play in ball joints, tie rod ends, etc. Trust the gauge, it is measuring directly off the spindle.
- Do not lock the set screw until final preload is achieved. For spacers without set screws, apply 1-2 drops of medium strength (blue) threadlocker.
- If the hub picks up additional end play at race temperature: (A) The hub races have moved closer together. This is common on new hubs. Repeat above procedure. (B) The thermal expansion of the hub has allowed the races to move closer together. Repeat above procedure and add additional preload (.001-.002”) (C) The thermal expansion of the spindle is greater than the expansion of the hub/spacer. Repeat above procedure and add additional preload (.001-.002”)
- Bearing preload increases resistance. Excessive end play creates excessive toe and drag due to bearings not being properly seated. A .001” change in preload will make a measurable difference.
|Hub Style||Suggested Pre-Load||Notes|
|Wide Five Style Hubs||.000” – .0005” End Play||Hub, Spindle and Spacer expansion difference minimal|
|2” Bearing (368A Bearings) Aluminum Hubs||.002” – .003” Preload||Must run pre-load. Races move closer at race temperature.|
|2” Bearing (368A Bearings) Steel Hubs||.001” – .000” Preload||Little to no preload required.|
|2 7/8” Big Bearing Wide Five Hubs||.001” – .000” Preload||Little to no preload required.|
|GN Aluminum 5×5 Hubs||.001 – .002” Preload||Slight preload recommended.|
|GN Steel 5×5 Hubs||.001” – .000” Preload||Little to no preload required.|
|Stock (Cast Iron) Front Hubs||.001” Preload||Slight preload recommended.|
|Stock Replacement (Aluminum) Front Hubs||.001” – .000” Preload||Little to no preload required.|
|Legends Car Front Hubs||.001” – .000” Preload||Little to no preload required.|
|Drag Race Front Hubs||.000” – .0005” End Play||No preload required.|