QU50719 OEM Late Pinion Crush Sleeves for GM 14 Bolt Rear Axles

QU50719 OEM Late Pinion Crush Sleeves for 1988-up GM 14 Bolt Rear Axles gets installed between the outer pinion bearing and a shoulder on the pinion stem. The Crush Sleeve which is also known as the Collapsible Pinion Spacer, controls the pinion bearing preload you set when you properly tighten the pinion nut. This is a use once and discard part, NEVER reuse a Crush Sleeve! This is a genuine AAM OEM service part.

For Aftermarket part, see: QU50555

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Dan the Gear Man® Tech Notes:
Product Note
Yoke Specs
Matching Parts
Applications

Tech Note 1: Product Note
The initial overall length of this spacer is greater than the normal separation distance between the outer pinion bearing and pinion shoulder. As you tighten your pinion nut against the yoke, you will push the outer bearing against this Spacer. At that point the nut will seem tight but your pinion will still be loose. You now must increase the torque applied to the nut by a substantial margin to initiate the compression of the spacer. Once it starts to compress, the required torque needed to continue tightening the nut will still be high, but reduced from the amount needed to start compression. As the Spacer collapses, your pinion end play will gradually disappear. When all end-play is gone, you have to be very careful as it will only take a small movement of the nut to go from too loose to too tight. If you over tighten the nut, you MUST get a new spacer and start over!!! Never back off the nut to try and reduce the rotating preload of the pinion!!!!

Tech Note 2: Yoke Specs
QU50719 fits all 1989-up GM 14 Bolt 10-1/2" Ring Gear full float rear axles. According to the GM Parts Books, it will fits 1988 model year trucks EXCEPT some early production 1988 R/V (old square body style) 3500 1 ton trucks which use QU50614 Crush Sleeve. If you have a 1973-1987 truck use QU50614 Crush Sleeve.

Tech Note 3: Matching Parts
Matching Parts for QU50719 Pinion Preload Spacers:
QU30093 Pinion Nut

Applications
GM 14 Bolt Rear Axles: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018