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06-01-2011, 06:57 AM
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#1 |
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Senior Member
 
Join Date: Apr 2008
Location: Berne IN
Posts: 3,209
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72 no spin diff?
I'm almost sure this is a eaton 3/4 ton no spin. Can someone confirm this? Also, I counted 32 teeth on the ring gear- what ratio is it? Thanks for your input/help! (The SPID does say NO SPIN)
Last edited by 72 tigger; 06-01-2011 at 09:36 PM. |
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06-01-2011, 09:33 PM
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#2 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,712
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Re: 72 no spin diff?
I think it is a 2 pinion open diff. (Meaning just one set of spider gears). And you need both the pinion and ring gear teeth to know the ratio. FYI, it should be stamped on the outside diameter of the ring gear somewhere. 32:7 = 4.57 if that is how many teeth on the pinion gear. The day/date/year should be stamped as well.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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06-01-2011, 10:13 PM
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#3 |
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Registered User
Join Date: Nov 2010
Location: Carlsbad, CA
Posts: 1,584
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Re: 72 no spin diff?
There should be a code stamped on top of your carrier on the input shaft side. The first two or three letters will identify what series it's for (10,20 or 30), the ratio, and if it had positraction or not. The codes are listed in the Chevy Truck Parts Catalog. Mine is JU (Series 20, 4.10, no posi). Pic of mine showing code below.
If you tell me the year and the code I can look it up for you if you like.
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- Jim - My Daily Driver is a 1969 Chevrolet Custom/20 Fleetside 350/TH400/Eaton H052 4.10 and its Project thread is here http://67-72chevytrucks.com/vboard/s...d.php?t=456911 Last edited by bollybib; 06-01-2011 at 10:14 PM. |
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06-02-2011, 01:10 AM
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#4 |
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Senior Member
Join Date: Mar 2001
Location: From Kansas now in Palmer, Alaska
Posts: 807
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Re: 72 no spin diff?
You can't tell from the angle you took the picture from, the case is the same for a locker and open diff. Take a picture from the right more and you will either see spider gears...or not. If you have spider gears you have an open diff. You can also check by jacking the rear end up and rotating one side forward and back while having someone else hold the opposite side. It will click and engage if it is a locker.
JOhn
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63 Buick Wildcat 425 72 Chevy Blazer CST 72 Chevy C10 Cheyenne 00 Ford F-350 Super Duty 7.3L 09 Dodge Challenger SRT-8 10 Ford Expedition Limited |
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06-02-2011, 07:02 AM
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#5 |
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Senior Member
Join Date: Apr 2008
Location: Berne IN
Posts: 3,209
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Re: 72 no spin diff?
Thanks for the help!
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