OK, I need help from rear axle gurus... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68gmsee · 09-16-2008, 09:51 AM

I am rear axle challenged and my 68 GMC 250 standard with a Dana has been making a clunking sound when I turn. It's mostly on the first turn after sitting for a day or two.

About 6 months ago I replaced the pinion oil seal, removed rear cover and cleaned and replaced the gear oil and cover gasket.

Here's what I have checked for: Loose bed bolts, axle spring bolts, shackles, lug nuts, shocks, etc. all look good.

What I noticed: I lifted the rear tire and pushed and pulled on it and found it had a slight in and out movement. Maybe 1/8th inch movement or slightly more. Could this be it? What's the fix?

71BB_LWB · 09-16-2008, 12:16 PM

Is it a Posi?
Did you put any posi additive in when you refilled it?

I'm not sure about a Dana rear but on the 12 bolt that side to side play is normal, The axel is held in place by a "C" clip and there is some play in it.

Longhorn Man · 09-16-2008, 03:22 PM

Is this a 1500 or a 2500 GMC? (6 or 8 lug wheels)

68gmsee · 09-16-2008, 04:45 PM

Thanx for responses...

The truck is a 68 GMC 1500 series, 3.54 Dana with 10 bolt rear end. No positraction. Not sure what grease I used but I can find out... bought it at Auto Zone.

Now, as I mentioned, I've only noticed the noise only when it's cold and I'm turning.

One other thing I forgot to mention. I have removed the sides of the bed before and haven't rewelded them back to the bed. That's sort of a long shot since I notice it mostly on the first turn and not on subsequent turns.

09-16-2008, 09:51 AM	#1
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	OK, I need help from rear axle gurus... I am rear axle challenged and my 68 GMC 250 standard with a Dana has been making a clunking sound when I turn. It's mostly on the first turn after sitting for a day or two. About 6 months ago I replaced the pinion oil seal, removed rear cover and cleaned and replaced the gear oil and cover gasket. Here's what I have checked for: Loose bed bolts, axle spring bolts, shackles, lug nuts, shocks, etc. all look good. What I noticed: I lifted the rear tire and pushed and pulled on it and found it had a slight in and out movement. Maybe 1/8th inch movement or slightly more. Could this be it? What's the fix?

09-16-2008, 12:16 PM	#2
71BB_LWB Thread Killer! Join Date: Feb 2002 Location: Chandler, Arizona Posts: 235	Re: OK, I need help from rear axle gurus... Is it a Posi? Did you put any posi additive in when you refilled it? I'm not sure about a Dana rear but on the 12 bolt that side to side play is normal, The axel is held in place by a "C" clip and there is some play in it. __________________ 71 Cheyenne SWB LS1 and auto. http://67-72chevytrucks.com/vboard/s...d.php?t=256470 _____________________________________ If it's worth doing, it's worth doing twice... _____________________________________ Don't Mistake Honesty for Negativity... Last edited by 71BB_LWB; 09-16-2008 at 12:18 PM.

09-16-2008, 03:22 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: OK, I need help from rear axle gurus... Is this a 1500 or a 2500 GMC? (6 or 8 lug wheels)

09-16-2008, 04:45 PM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: OK, I need help from rear axle gurus... Thanx for responses... The truck is a 68 GMC 1500 series, 3.54 Dana with 10 bolt rear end. No positraction. Not sure what grease I used but I can find out... bought it at Auto Zone. Now, as I mentioned, I've only noticed the noise only when it's cold and I'm turning. One other thing I forgot to mention. I have removed the sides of the bed before and haven't rewelded them back to the bed. That's sort of a long shot since I notice it mostly on the first turn and not on subsequent turns.



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