Jeep Wrangler front shaft failure.

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dmatchett
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Joined: Tue Mar 01, 2016 5:45 pm
First Name: Douglas
Last Name: Matchett
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Jeep Wrangler front shaft failure.

Post by dmatchett » Tue Apr 12, 2016 11:25 am

We have seen a increase in the Jeep Wrangler (JK) front axle shafts with a Dana 30 1310 series
driveline experiencing failure with damage to the yokes. With oversize tires and locking differential
units the u-joint bearing caps when under load will try to spin in the yoke while functioning, as it is
rotating the c-clips are forced out allowing the cap to walk out of the yoke. This results
in the u-joint trunnion destroying the axle yoke, it may not break the yoke but will damage it to the
point it can't properly hold the cap anymore. To correct this problem, Transtar had the front shafts made
in the aftermarket to accommodate the 5-760X Spicer u-joint which comes with half circle clips but also
to take the full circle clip, this clip is .002" thicker and will not back out when under load. Each complete
axle assembly will come with inner axle,outer axle, Spicer u-joint and a 4 full round clips (# 713W921).
Always recommend the customer install the full circle c-clip provided, some aftermarket companies are
replacing the original axle shafts with a CV axle, it works but is very expensive.
Right side axle assembly # 713W670 1310 series
Left side axle assembly # 713W670A 1310 series
Outer shaft # 713W672, Right side inner 713W671A, Left side inner # 713W671

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tschafers
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Joined: Thu Oct 31, 2013 3:16 pm
First Name: Tony
Last Name: Schafers
Other: Advanced Drivelines Instructor

Re: Jeep Wrangler front shaft failure.

Post by tschafers » Tue Apr 12, 2016 3:47 pm

In my opinion the CV shaft is the only way to go, this corrects two issues.

Excessive driveline angles that cause wear and vibration and non uniform velocity that causes vibration and wear.

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