Mystery rear end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Stainless · 06-23-2003, 07:40 AM

Hey.... I found that clunky sound I posted about last week.... it was a U-Joint.... seems that there is some extra space on the rear yoke, so the joint just bangs back and forth in it.... The question is... what rear end is it? After an hour of wire brushing, I don't see any numbers stamped anywhere.... it is a 12-bolt, open rear end..... that's all I know.... buy why would the yoke be a different size than what seems to be fairly standard? It is about 1/16" or 3/32" bigger than the u-joint. Just enough to let the shaft slap around.... any thoughts?

~Sean

JimKshortstep4x4 · 06-23-2003, 09:05 AM

Is the dimension that you gave on the diameter or length of the u-joint recess?

If it is the diameter than chances are that you can locate larger cups for your u-joint.

Otherwise, you can change out your yoke.

Jim
Jim

Stainless · 06-23-2003, 12:23 PM

The dimension is the length of the ujoint... the diameter is fine.... I'm really curious more than anything else as to what this rear end is out of.... I don't have any history on it.....

~S

yellowgmc · 06-23-2003, 12:28 PM

any pics? maybe someone upgraded it, or it's just really, really worn out.

Longhorn Man · 06-23-2003, 05:46 PM

If it is a coil rear, look to see if the pan hand bar mounting point was welded on by GM or a dude. 99.999% of the dudes would not do a neat job on it, while GM's looked pretty dang neat.
That will tell you if the rear is a truck rear or not.
I think the odds are better that the wrong size U-joint is in there.

06-23-2003, 07:40 AM	#1
Stainless Registered User Join Date: Jan 2003 Location: N.Canton Ohio Posts: 59	Mystery rear end Hey.... I found that clunky sound I posted about last week.... it was a U-Joint.... seems that there is some extra space on the rear yoke, so the joint just bangs back and forth in it.... The question is... what rear end is it? After an hour of wire brushing, I don't see any numbers stamped anywhere.... it is a 12-bolt, open rear end..... that's all I know.... buy why would the yoke be a different size than what seems to be fairly standard? It is about 1/16" or 3/32" bigger than the u-joint. Just enough to let the shaft slap around.... any thoughts? ~Sean

06-23-2003, 12:28 PM	#4
yellowgmc Getting cabin fever?!?!?! Join Date: Oct 2002 Location: chisholm, mn Posts: 1,679	any pics? maybe someone upgraded it, or it's just really, really worn out. __________________ Member of the Discs Up Front Club 1972 GMC 1500 1994 F-150 XL 4x4 Tact is for people not whitty enough to be sarcastic

06-23-2003, 09:05 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Is the dimension that you gave on the diameter or length of the u-joint recess? If it is the diameter than chances are that you can locate larger cups for your u-joint. Otherwise, you can change out your yoke. Jim Jim

06-23-2003, 12:23 PM	#3
Stainless Registered User Join Date: Jan 2003 Location: N.Canton Ohio Posts: 59	The dimension is the length of the ujoint... the diameter is fine.... I'm really curious more than anything else as to what this rear end is out of.... I don't have any history on it..... ~S

06-23-2003, 05:46 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	If it is a coil rear, look to see if the pan hand bar mounting point was welded on by GM or a dude. 99.999% of the dudes would not do a neat job on it, while GM's looked pretty dang neat. That will tell you if the rear is a truck rear or not. I think the odds are better that the wrong size U-joint is in there.



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