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M54A1

Pinion Slack

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I have a single axle B61, I had noticed a vibration at higher speeds and found that the pinion shaft had a little bit of slack up and down when I would push on the drive shaft, How can I get rid of the slack? Thanks

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When I bought my B, the seal started leaking on the pinion. Once I got the driveshaft off, I was able to wobble the pinion slightly. Seems someone had it apart before and didn't tighten the nut enough. I put a new seal in and then got the nut one more notch(for cotterpin) and it's been fine for 5 yrs now.

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THE BOLT THAT HOLDS THE YOKE TO THE SHAFT MAY BE LOUSE OR BACKED OFF A BIT. BEST WAY TO CHECK IS TO REMOVE THE U JOINT AND TIGHTEN THE BOLT WITH AN AIR RATCHET. IF THAT BOLT COMES LOUSE IT GIVES THE BEARINGS SLACK AND THE PINION CAN MOVE A LITTLE. ALSO IF THERE WAS ALOT OF SLACK THE SEAL MAY BE BAD. LOOK FOR OIL LEAKS UNDER THAT YOKE AND CHECK YOUR DIFF OIL LEVEL JUST TO BE SAFE

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I'm not sure what holds the preload on the pinion bearings? solid sleeve or crush sleeve(like a Ford 9"). The nut is cotterpinned, so in reality it should not come loose unless there is issues inside(like bearings or crush sleeve).

I didn't have access to big air impact so a 3/4" breaker bar did the job.

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