QT1098 Differential Master Bearings (Reference Only)

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QT1098 Differential Master Bearings for Dana 60 and 70 Axles. Also known as Dummy Bearings, these precision machined, solid steel tools are used in place of real bearings to easily determine the shim thickness required for correct backlash and differential bearing preload. Made to be a slip fit on your diff so you can slide the differential side to side to determine the overall shim distance and the ring gear side distance with a dial indicator. With those two figures you can easily calculate the opposite side shim pack (Order TM4400 for Service Procedures). Made for the 3-13/16" OD bearings on all Dana-Spicer Model 60 and standard Dana-Spicer Model 70 series axles. Will not work on Dana-Spicer Model 70HD axles which have 4.125" diameter bearing cups and use QT1099 Master Bearings. USA Made.

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Dan the Gear Man® Tech Notes:
Needed?
Tech Help
Applications

Tech Note 1: Needed?
If you are installing a new gear set and/or a new differential you will need Master Bearings. If one or both of your differential bearing cups wore sideways into the housing or a diff bearing spun on the differential and tore the shims, you will also need these tools to determine the correct shim packs. Both conditions are very common on rear axles especially with Diesel powered trucks. However, if you are just doing a simple re-bearing job on a factory setup axle using OE Quality Bearings (See QU50397, QU50398) and your housing is not worn, you probably will not need Master Bearings.

Tech Note 2: Tech Help
Rebearing service procedures are covered in my TM4400 Pinion and Differential Bearing Service on Dana-Spicer Monobeam Axles.

Applications
All Dana-Spicer Model 60 axles
All Dana-Spicer Standard Model 70 and 70U series Axles