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Importance of the Axle Spider Gear Shaft Retainer Bolt or Pin

how-to 4x4 repairs mechanical tips automotive technology

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#1 Moses Ludel

Moses Ludel

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Posted 20 May 2014 - 09:23 AM

Forum Member Alberto from Colombia did a rear axle lube change on his recently purchased 1989 Jeep Wrangler 4x4.  He discovered that the Dana 35 rear axle differential case is missing the lock pin retainer for the pinions/spider gear shaft.  This is a crucial safety issue and deserves its own topic.  Here is a copy of my response to Alberto, we can discuss this further:

 

"Alberto...The "missing" lock pin retainer on the pinions or "spider gears" shaft is very important, as this lock pin holds the pinions/spider gears shaft in place. 

 

Warning: If the pinions/spider gear shaft works its way out on a C-clip design axle, the axle shafts can slide inward, C-clips drop loose, and the axle shaft(s) can slide out the side of the vehicle.  This results in severe damage or an accident due to loss of vehicle control.  On both the C-clip and non-C-clip axles, if the pinions/spider gear shaft slides out, it can destroy parts or even cause axle parts to seize.  The rear axle could lock up and cause a severe loss of vehicle control and an accident.

 

According to the 1989 factory service manual (U.S. edition), your rear Dana 35 axle should not have a C-clip design axle.  You should have press-on axle shaft bearings and bearing retainer plates at the outer tube ends of the axle housing.  The retainers keep the bearings and axle shafts from sliding out of the axle housing, and the axle shafts with bearings are a snug fit into the axle tube ends.  These "seal retainer" plates attach to the brake backing plate studs.  

 

Some differential carriers (typically those with C-clip axles) use a retainer bolt to hold the pinion shaft in place.  These bolts are notorious for snapping during removal.  This ends up a major problem, as the high tensile strength sheared bolt shank must be removed before the axle can be serviced.  (I'll save this repair for when such a question comes up in the forums.)  Most often, during axle shaft bearing or seal replacement service, the bolt snaps as you try to remove it.

 

In your situation, if this is not a C-clip axle, you should have a pinion/spider gear shaft "lock pin" and not a lock bolt.  You may be able to install a new pin with the differential still in the axle housing.  Access may be an issue, but this part is very important.  If you cannot install the lock pin retainer with the differential case and ring gear in position, you will need to remove both axle shafts and the differential case with the ring gear to access the lock pin hole.  First see if you can access the retainer pin hole without removing the differential case.

 

Here is the illustration of an "open" differential, not a limited slip.  Zoom-in for details.  (Your mouse scroll wheel may be necessary for this step.)...Note the role of the shaft lock pin, Mopar P/N S0455313.  This may be a generic part number:

 

gif.gif  1989 Wrangler Rear Axle.bmp   7.52MB   1 downloads

 

 

If you have Trac-Lok, that differential also uses a lock pin to hold the differential shaft in place.  Here are the Mopar part numbers for the Trac-Lok differential spider gear (pinions) shaft lock pin:

 

PIN, Retaining...83505019 (1987-89); 05252502 for 1990

 

You do need to take care of this lock pin issue right away, Alberto...

 

Moses





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