Rear end help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

outlaw1972 · 12-05-2011, 02:12 PM

I have a 72c10 and would like to know if it has limited slip the # on the axel tube is THB W158 2E. I took the rear cover off and counted the teeth it is a 307 but im just not sure a bout the limited slip part any info would be great.

Coley · 12-05-2011, 04:05 PM

A quicker way to start is to check the glovebox for the build sheet and see if it is listed in the option group. Then check the passenger side behind the seat for a sticker/label stating that the vehicle is equipped with the positraction axle.
Next, you can jack up the back of the truck and rotate one of the wheels. Usually both wheels will rotate in the same direction. If the wheels rotate in opposite directions...usually (not always) the differential is an 'open' (non-posi) type.
There are a few exceptions to this.
Good Luck
Coley

no moa · 12-05-2011, 04:44 PM

Here a couple pics, might help. left is a posi, Right is an open diff.

outlaw1972 · 12-05-2011, 05:47 PM

My rear end looks like the one on the left, but the springs in mine are real close to each other. Thers no gap in between them like the one in the pic. So i wonder if it is posi or not ?

Solver · 12-05-2011, 08:56 PM

My book shows THB = 1971 C-10 3:07 Posi

Coley · 12-05-2011, 09:12 PM

Quote:

Originally Posted by outlaw1972

My rear end looks like the one on the left, but the springs in mine are real close to each other. Thers no gap in between them like the one in the pic. So i wonder if it is posi or not ?

It looks like you have posi.....but what happens when you floor it?...both wheels should spin. Is this not what happens?
Coley

**Ironangel** · 12-05-2011, 10:05 PM

[QUOTE=Solver;5049793]My book shows THB = 1971 C-10 3:07 Posi[/QUOTE Nuff Said

chevytruckluver · 12-05-2011, 11:46 PM

Quote:

Originally Posted by outlaw1972

My rear end looks like the one on the left, but the springs in mine are real close to each other. Thers no gap in between them like the one in the pic. So i wonder if it is posi or not ?

Hi Outlaw, if you can see the springs you have a posi. if you turn the carrier inside the housing you would see 2 more spings on the other side they are directly opposite ofthe ones you can see now. There are 4 springs the same type in there

NewAge1970 · 12-06-2011, 12:19 AM

Where is the number on the axle tube?I'd like to check mine as well (replacing with a locker rear end and need to know the size of the carrier )
Posted via Mobile Device

Solver · 12-06-2011, 12:36 AM

axle numbers here but really have to clean well as they aren't cut to deep

NewAge1970 · 12-06-2011, 01:08 AM

I've got a 2wd short step gmc. I'll take a peak
Posted via Mobile Device

outlaw1972 · 12-06-2011, 10:58 AM

Quote:

Originally Posted by chevytruckluver

Hi Outlaw, if you can see the springs you have a posi. if you turn the carrier inside the housing you would see 2 more spings on the other side they are directly opposite ofthe ones you can see now. There are 4 springs the same type in there

Yes there are 2 more springs in there, i just wasnt looking good enough. Thanks for all the info everyone

no moa · 12-06-2011, 11:01 AM

The fact that the numbers on the axle tube may read posi, and the SPID read posi, doesn't mean there is one. I have bought several cars over the years that said posi (g80) rear, and have not had one. the best way is to open it up.

12-05-2011, 02:12 PM	#1
outlaw1972 Registered User Join Date: Nov 2011 Location: wichita falls TX Posts: 28	Rear end help I have a 72c10 and would like to know if it has limited slip the # on the axel tube is THB W158 2E. I took the rear cover off and counted the teeth it is a 307 but im just not sure a bout the limited slip part any info would be great.

12-05-2011, 04:05 PM	#2
Coley Registered User Join Date: Oct 2011 Location: Victoria, B.C Posts: 3,794	Re: Rear end help A quicker way to start is to check the glovebox for the build sheet and see if it is listed in the option group. Then check the passenger side behind the seat for a sticker/label stating that the vehicle is equipped with the positraction axle. Next, you can jack up the back of the truck and rotate one of the wheels. Usually both wheels will rotate in the same direction. If the wheels rotate in opposite directions...usually (not always) the differential is an 'open' (non-posi) type. There are a few exceptions to this. Good Luck Coley __________________ ....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500

12-05-2011, 04:44 PM	#3
no moa Registered User Join Date: Nov 2009 Location: maine Posts: 2,315	Re: Rear end help Here a couple pics, might help. left is a posi, Right is an open diff. Attached Images __________________ 1972 C10 Deluxe.Shortbed. 402/400. A/C, white interior, needs complete restore. Project Red, white and blue. Used to be a Longbed apperently. http://67-72chevytrucks.com/vboard/s...d.php?t=451950 1971 c10 step 250 3 OTT 1969 c30 TOW-MATER. 307 4 speed, holmes 440 body. http://67-72chevytrucks.com/vboard/s...d.php?t=451082 2006 CTS-V LS2 6spd.

12-05-2011, 05:47 PM	#4
outlaw1972 Registered User Join Date: Nov 2011 Location: wichita falls TX Posts: 28	Re: Rear end help My rear end looks like the one on the left, but the springs in mine are real close to each other. Thers no gap in between them like the one in the pic. So i wonder if it is posi or not ?

12-05-2011, 08:56 PM	#5
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Re: Rear end help My book shows THB = 1971 C-10 3:07 Posi __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

12-05-2011, 10:05 PM	#7
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Rear end help [QUOTE=Solver;5049793]My book shows THB = 1971 C-10 3:07 Posi[/QUOTE Nuff Said __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

12-06-2011, 12:19 AM	#9
NewAge1970 Registered User Join Date: Oct 2010 Location: Riverton Wyoming Posts: 93	Re: Rear end help Where is the number on the axle tube?I'd like to check mine as well (replacing with a locker rear end and need to know the size of the carrier ) Posted via Mobile Device __________________ "Its better to burn out than it is to rust!" '70 GMC C10 2wd. 2.02 aluminum heads. TH400 trans. 450WHP '04 Nissan 350z DD, Twin Turbo, 600whp, drag beast!

12-06-2011, 12:36 AM	#10
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Re: Rear end help axle numbers here but really have to clean well as they aren't cut to deep Attached Images __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

12-06-2011, 01:08 AM	#11
NewAge1970 Registered User Join Date: Oct 2010 Location: Riverton Wyoming Posts: 93	Re: Rear end help I've got a 2wd short step gmc. I'll take a peak Posted via Mobile Device __________________ "Its better to burn out than it is to rust!" '70 GMC C10 2wd. 2.02 aluminum heads. TH400 trans. 450WHP '04 Nissan 350z DD, Twin Turbo, 600whp, drag beast!

12-06-2011, 11:01 AM	#13
no moa Registered User Join Date: Nov 2009 Location: maine Posts: 2,315	Re: Rear end help The fact that the numbers on the axle tube may read posi, and the SPID read posi, doesn't mean there is one. I have bought several cars over the years that said posi (g80) rear, and have not had one. the best way is to open it up. __________________ 1972 C10 Deluxe.Shortbed. 402/400. A/C, white interior, needs complete restore. Project Red, white and blue. Used to be a Longbed apperently. http://67-72chevytrucks.com/vboard/s...d.php?t=451950 1971 c10 step 250 3 OTT 1969 c30 TOW-MATER. 307 4 speed, holmes 440 body. http://67-72chevytrucks.com/vboard/s...d.php?t=451082 2006 CTS-V LS2 6spd.



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