Description
QU40259ASM Heavy Duty Differential Side Bearing Set for Ford Sterling 10.25", 10.50" and Dana-Spicer Model 70HD, Model 80, plus many early model 70 standard Rear Axles are original equipment quality replacements for all these differentials with 4.25" diameter bearing cups. QU40259 Kit includes two each QU50402 Bearing Cups and QU50403 Tapered Bearings. Imported.
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Dan the Gear Man® Tech Notes:
Worn Bearings
Product Note
Applications
Tech Note 1: Worn Bearings
Worn out Differential Bearings are the second leading cause of catastrophic Dana 80 axle failures (lubrication issues is #1.) If your truck has a Diesel or Heavy Duty gas engine, you should replace the Differential Bearings and Cups every 150,000 miles or less in rear axle applications. Letting your Bearings go too long will cause the cups to wear sideways into the axle housing and the cones to spin on the diff case. Your pocketbook will not like the results. Re-bearing service procedures are covered in my TM4400 Pinion and Differential Bearing Service on Dana-Spicer Monobeam Axles.
Tech Note 2: Product Note
This Set DOES NOT FIT any Model 70, Model 70U or Model 70-2U axle with 3-13/16" diameter bearing cups. For these applications see QU40184.
Applications
(Will continue to add applications as time permits)
Chevy and GMC
1 Ton Square Body Style Pickup with Dana 70HD and Dual Rear Wheels: 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
Dodge:
Almost All Model 70 Rear Axles: 1979, 1980, 1981, 1982, 1983, 1984
Ram 2500 and Ram 3500 With Model 80: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
Ford:
F-350, F-450 Super Duty with Model 80: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
F-350 Super Duty with Dual Rear Wheel Dana 80: 1999-current
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