How do I adjust the lash in the diff
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Senior User
Joined: Mar 2003
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How do I adjust the lash in the diff
I have some play in the third member (99 F350) and was wondering if there is a way to adjust the grear lash while in the truck. I was told there is a crush sleeve and I could just tighen the yoke nut is this true?
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
What kind of play are you referring to? Pinion twist, up & down, or in & out? Tightening the nut adjusts the pinion bearing preload. Overtightening can lead to bearing failure. Gear mesh is adjusted with shims behind the pinion gear and behind the differential housing carrier bearing races.
Hotshot
Joined: May 2005
Posts: 13,484
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From: Stevens Point, WI
No.
There is a sequence of how things are assembled and set in the rear end.
I am sorry I am not a gear guru but I do know some (set up a couple rear ends).
The pinion is set to depth to contact the center of the ring gear teeth, then the lash is adjusted out by the carrier bearing shims/nuts.
Just don't start turning nuts and bolts in the rear end.
There is a sequence of how things are assembled and set in the rear end.
I am sorry I am not a gear guru but I do know some (set up a couple rear ends).
The pinion is set to depth to contact the center of the ring gear teeth, then the lash is adjusted out by the carrier bearing shims/nuts.
Just don't start turning nuts and bolts in the rear end.
Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
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From: Marseilles IL
If you have twist in on your pinion then you have bad pinion bearings, or lots of wear on the ring and pinion. Tightening the pinion nut will not make things better. Loose is wear. Unfortunately there's gona be a new ring and pinion and bearings in your future.
Fleet Mechanic
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Postmaster
Joined: Jan 2012
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From: West of Chicago
If you catch it early you might be able to get away with just a set of bearings.
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Freshman User
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is the pinion loose and move up and down or just twist an 1/8 turn back and forth .if the bearings are tight that twist is normal your feeling the slop from the pinion through the spider gears to the axles .before you go and tighten anything pull the cover and look inside back lash is the clearence between the gear teeth and is adjusted by moving the ring gear closer or farther away from the pinion using shims .if there is up and down pinion slop your seal is probly leaking? then your most likley need to replace all bearings a master overhaul kit is about 250
Senior User
Joined: Mar 2003
Posts: 428
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From: Hot Springs Village, Ar
Slip joint regreasing
Actually i/8 twist is probably about right. You will have some slop of the gears. You may be feeling the clunk in the driveshaft where the splines connect. They need to be greased from time to time.
Do search under (slip joint regreasing)
Actually i/8 twist is probably about right. You will have some slop of the gears. You may be feeling the clunk in the driveshaft where the splines connect. They need to be greased from time to time.
Do search under (slip joint regreasing)
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