What does it mean when... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JameslovesJammie · 06-26-2006, 11:24 AM

OK,

I jacked the rearend of my truck up to check to see if I have a posi or not. I am on the passenger side, so that's the wheel I turn. The other wheel doesn't turn at all.

So I jack the rear end up a little more, incase the other was stuck to the dirt. I have it up about an inch off the ground and try again. Same thing.

I go to the driver's side and turn that wheel. The passenger side turns the opposite direction. I go back to the passenger side and turn it again...nothing.

Is my rearend screwed up? I thought you were supposed to be able to turn either wheel and the opposite would turn.

Thanks guys!

James

wibilly · 06-26-2006, 11:30 AM

i don't think that indicates a problem it a open diff and mabe your breaks are dragging a little on the drivers side

billsbowtie · 06-26-2006, 12:32 PM

IT SHOULD HAVE A TAG LIKE THIS ONE IF IT IS POIS.

billsbowtie · 06-26-2006, 12:34 PM

THIS IS THE EASYEST WAY TO CHECK TAKE THE COVER OFF AND SEE IF IT LOOKS LIKE THIS.

glock35ipsc · 06-26-2006, 12:37 PM

If you can spin one side with the opposite tire on the ground, it is an open differential. If it is posi, you shouldn't be able to spin one side while the other is on the ground.

68speedalert · 06-26-2006, 12:45 PM

billsbowtie, that is an accurate way to checkm but WAAYYY overkill.

But your jack under the center of the diff, put the trans in neutral, and spin one of the tires. If the other spins in the opposite direction or the driveshaft turns (without the other wheel spinning) you have an open diff, (which your's is BTW).

With posi or limited-slip, the wheel will spin the SAME direction.

**71swb4x4** · 06-26-2006, 01:05 PM

Quote:

Originally Posted by 68speedalert

With posi or limited-slip, the wheel will spin the SAME direction.

Actually, if it's posi, if it's in nuetral and the rear-end is jacked up. the tires will spin in opposite directions.

dave666693 · 06-26-2006, 01:24 PM

I agree with 68speedalert. If it is an Eaton check the numbers on top of the pumpkin. GMC Paul's website has a referance chart

68speedalert · 06-27-2006, 01:29 AM

Quote:

Originally Posted by 71swb4x4

Actually, if it's posi, if it's in nuetral and the rear-end is jacked up. the tires will spin in opposite directions.

I won't say your wrong, but I've never seen it. From my experience (25 years wrenching), If you can make the other side turn opposite with a posi......the clutches in the diff are GONE!

With good clutches and trans in neutral, both tires turn the same AND the driveshaft will turn as well.

If you put the trans in gear (or park), a posi rear end will not even let ONE side turn, basically what glock35ipsc said.

**SactoJim** · 06-27-2006, 02:45 AM

I'm with 68speedalert.....I've had many posi's (limited slip's) and the quickest way to check was like he said.

06-26-2006, 11:24 AM	#1
JameslovesJammie God Bless Mr. T Join Date: Apr 2004 Location: Minot, ND Posts: 348	What does it mean when... OK, I jacked the rearend of my truck up to check to see if I have a posi or not. I am on the passenger side, so that's the wheel I turn. The other wheel doesn't turn at all. So I jack the rear end up a little more, incase the other was stuck to the dirt. I have it up about an inch off the ground and try again. Same thing. I go to the driver's side and turn that wheel. The passenger side turns the opposite direction. I go back to the passenger side and turn it again...nothing. Is my rearend screwed up? I thought you were supposed to be able to turn either wheel and the opposite would turn. Thanks guys! James __________________ Like a midget at a urinal...sometimes you must stay on your toes.

06-26-2006, 11:30 AM	#2
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: What does it mean when... i don't think that indicates a problem it a open diff and mabe your breaks are dragging a little on the drivers side __________________ common sense isn't so common anymore

06-26-2006, 12:32 PM	#3
billsbowtie Senior Member Join Date: Feb 2003 Location: rose hill V.A. 24281 Posts: 17,997	Re: What does it mean when... IT SHOULD HAVE A TAG LIKE THIS ONE IF IT IS POIS.

06-26-2006, 12:34 PM	#4
billsbowtie Senior Member Join Date: Feb 2003 Location: rose hill V.A. 24281 Posts: 17,997	Re: What does it mean when... THIS IS THE EASYEST WAY TO CHECK TAKE THE COVER OFF AND SEE IF IT LOOKS LIKE THIS.

06-26-2006, 12:37 PM	#5
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: What does it mean when... If you can spin one side with the opposite tire on the ground, it is an open differential. If it is posi, you shouldn't be able to spin one side while the other is on the ground. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

06-26-2006, 12:45 PM	#6
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	Re: What does it mean when... billsbowtie, that is an accurate way to checkm but WAAYYY overkill. But your jack under the center of the diff, put the trans in neutral, and spin one of the tires. If the other spins in the opposite direction or the driveshaft turns (without the other wheel spinning) you have an open diff, (which your's is BTW). With posi or limited-slip, the wheel will spin the SAME direction. __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

06-26-2006, 01:24 PM	#8
dave666693 Registered User Join Date: Jul 2005 Location: Edgewood, WA Posts: 901	Re: What does it mean when... I agree with 68speedalert. If it is an Eaton check the numbers on top of the pumpkin. GMC Paul's website has a referance chart

06-27-2006, 02:45 AM	#10
SactoJim Registered User Join Date: Oct 2005 Location: Sacramento, CA Posts: 1,970	Re: What does it mean when... I'm with 68speedalert.....I've had many posi's (limited slip's) and the quickest way to check was like he said.



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