PDA

View Full Version : Pinion flange loose on pinion?


AxleIke
12-01-2010, 12:25 PM
Pulled my driveshaft to get rebalanced after landing the truck on it at chinamans.

My pinion flange will wiggle up and down, but not the shaft. The flange moves on the shaft? That seems like its next to impossible, and I must be imagining it, but I don't know? Bearings have less than 10k on em. Certainly possible that they are trashed. Maybe just the outer bearing?

Thoughts?

60wag
12-01-2010, 12:53 PM
Put an indicator on the pinion shaft and give it a wiggle. Its possible the spline is worn and the flange is loose but your bearing preload must be near zero if the flange is moving easily.

rover67
12-01-2010, 12:57 PM
Does it have a crush sleeve?

Maybe the crush sleeve crushed a bit more...

AxleIke
12-01-2010, 01:03 PM
yes crush sleeve.

I'll check it out.

Air Randy
12-01-2010, 01:33 PM
If the pinion nut is loose there is usually enough slop in the splines to let the flange wiggle a small amount.

If your pinion nut is loose it's most likely as Marco said, your crush sleeve crushed a little bit more. If you hit your flange on a rock just right that can do it or if you get a little bound up and really put the torque to it that can do it too. Thats why they recommend solid spacers versus crush sleeves for HD off road use.

If the yoke is tight on the pinion then it's bearing slop you're feeling. Either way you will have to pull the yoke, seal and front bearing to replace the crush sleeve.

SteveH
12-01-2010, 01:40 PM
The pinion flange on my '98 4Runner mysteriously got loose this summer. The OEM-staked nut did not turn, so I assume some bearing wear. To fix this, I unstaked and tightened the rear output nut to 90 lb-ft, per the manual, and the looseness and felt vibration have disappeared. There are no odd sounds from the xfer case. When/if this returns, I will presumably have to replace the bearing.

Air Randy
12-01-2010, 05:30 PM
Are you talking about the pinion flange on the rear differential, which is what AxleIke is referring to, or are you talking about the output shaft on your transfer case?

It's OK to re-torque the nut on the TC output shaft. But if you are talking about re-torquing the pinion nut on the diff that is not a good idea unless you replace the crush sleeve with a new one. I've done it before in a pinch but technically you won't be able to get a correct pre-load on the pinion bearing without a new crush sleeve.

SteveH
12-02-2010, 11:47 AM
Randy - thanks for the cautionary note. My flange was on the xfer output. So far, so good.

AxleIke
12-02-2010, 12:20 PM
Yeah, my transfer output is loose too, but I already know about that and will be pulling the cases shortly to replace bearings.

I will likely just order up the solid spacer here, and be done with it. I'm swapping to a V6 3rd anyway, since I have v6 gears in there. Jackasses who sold me the gears assured me they were 4 cyl, but there was not indication on the box.

Air Randy
12-02-2010, 01:32 PM
I will likely just order up the solid spacer here, and be done with it.

They're a lot stronger and you'll never have the issue again.

J Kimmel
12-02-2010, 05:30 PM
They're a lot stronger and you'll never have the issue again.

and if it does come loose again (mine did on the trail once) you can jam it back on with an impact and re-stake.

good times

:)

Uncle Ben
12-02-2010, 05:32 PM
and if it does come loose again (mine did on the trail once) you can jam it back on with an impact and re-stake.

good times

:)

WERD!:thumb::thumb: