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Old 12-05-2011, 02:12 PM   #1
outlaw1972
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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.
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Old 12-05-2011, 04:05 PM   #2
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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
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Old 12-05-2011, 04:44 PM   #3
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Re: Rear end help

Here a couple pics, might help. left is a posi, Right is an open diff.
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http://67-72chevytrucks.com/vboard/s...d.php?t=451082

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Old 12-05-2011, 05:47 PM   #4
outlaw1972
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Question 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 ?
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Old 12-05-2011, 08:56 PM   #5
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Re: Rear end help

My book shows THB = 1971 C-10 3:07 Posi
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Old 12-05-2011, 09:12 PM   #6
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Smile Re: Rear end help

Quote:
Originally Posted by outlaw1972 View Post
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
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Old 12-05-2011, 10:05 PM   #7
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Re: Rear end help

[QUOTE=Solver;5049793]My book shows THB = 1971 C-10 3:07 Posi[/QUOTE Nuff Said
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Old 12-05-2011, 11:46 PM   #8
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Re: Rear end help

Quote:
Originally Posted by outlaw1972 View Post
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
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Old 12-06-2011, 12:19 AM   #9
NewAge1970
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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 )
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Old 12-06-2011, 12:36 AM   #10
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Re: Rear end help

axle numbers here but really have to clean well as they aren't cut to deep
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Old 12-06-2011, 01:08 AM   #11
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Re: Rear end help

I've got a 2wd short step gmc. I'll take a peak
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Old 12-06-2011, 10:58 AM   #12
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Wink Re: Rear end help

Quote:
Originally Posted by chevytruckluver View Post
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
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Old 12-06-2011, 11:01 AM   #13
no moa
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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.
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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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