QU20870 M275 Differential Pinion Shim Kit

QU20870 Ford M275 Rear Axle Pinion Depth Shim Kit for 2017-Current Ford Super Duty F250, F350 Dana M275 Rear Axles with Single Rear Wheels. QU20870 is a genuine Dana Spicer Kit that includes a selection of 12 different pinion depth shims for M275 rear axles so you can precisely adjust your pinion gear to the correct depth.
Also see:
QU20840 Master Differential Bearing and Seal Kit that includes Ring Gear Bolts and Pinion Depth Shims
QU20883 Standard Differential Bearing and Seal Kit that DOES NOT include Ring Gear Bolts and Shims

Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!

Dan the Gear Man® Tech Notes:
Kit Components and Specs
Matching Parts
Pinion Depth Setting
Pinion Preload
Applications

Tech Note 1: Kit Components and Specs
Includes 12 Shims ranging in size from 0.045 to 0.056.

• Inside Diameter (ID): 3.14
• Outside Diameter (OD): 4.01

Tech Note 2: Matching Parts
QU20846 Diff Cover
QU20830 Ring Gear Bolt
QU20840 Diff/Pinion Bearing and Seal Kit

Tech Note 3: Pinion Depth Setting
You need special Pinion-Depth Setting tools to accurately determine the correct pinion depth shim needed for your specific axle and gear set. The only exception is if you are just doing a re-bearing job with the original gear set and housing. If your original pinion shim was damaged, you can usually replace the damaged shim with a new shim of the exact same thickness as the original.

Tech Note 4: Pinion Preload
A collapsible spacer or crush sleeve is used to set pinion rotating preload. Final assembly of the pinion in the housing is done once depth is established and the final shim is installed under the inner pinion bearing cup. Assemble the pinion, inner pinion bearing (use QT1004 to install), crush sleeve, pinion slinger/thrust washer, pinion seal, pinion yoke or flange, pinion washer and pinion nut in the housing. Use a suitable tool to hold the pinion yoke/flange in place while the pinion nut is tightened. Tighten the pinion nut until the outer pinion bearing contacts the crush sleeve. At this point, the amount of torque to further tighten the pinion nut will greatly increase and you should still be able to feel some some end-play. From here, tighten the pinion nut in SMALL increments until all end-play is gone and the pinion rotating torque with NEW bearings is 20-32 pound-INCH (2.26-3.58 Nm). If you over-tighten the pinion nut so the pinion-only rotating torque exceeds the specification, you MUST replace the crush sleeve and start over. NEVER back off the pinion nut to reduce pinion rotating torque.  The above procedure and specification assumes you are installing new pinion bearings and the differential with ring gear is not yet installed in the axle housing.

Applications
Ford:
Super Duty F250, F350 SRW with M275 Rear Axles: 2017, 2018, 2019, 2020, 2021, 2022, 2023