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12-05-2015, 08:02 PM
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#1 |
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Registered User
 Join Date: Oct 2008
Location: los angeles, ca
Posts: 926
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Rear Differential Casting Number -- How to Decode??
Hello,
I've searched here on the forum and also on the interwebs... But there doesn't seem to be any info on how to decode our truck rear axle casting numbers... And also what the casting numbers tell us. Forgive me if the info is here, but again I searched and couldn't find -- Anyway, the casting numbers on my rear axle are as follows -- NF3896888 GM 59 Thanks for the help!! 
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12-05-2015, 11:17 PM
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#2 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Rear Differential Casting Number -- How to Decode??
Sounds like a 3.55 from a Chevelle, but hard to say. Are you sure this is out of a truck? Can you find the 3-letter code?
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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12-05-2015, 11:39 PM
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#3 | |
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Registered User
Join Date: Oct 2008
Location: los angeles, ca
Posts: 926
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Re: Rear Differential Casting Number -- How to Decode??
Quote:
I'll look tomorrow for the 3 letter code. Just curious as to what the casting # says |
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12-05-2015, 11:44 PM
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#4 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,715
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Re: Rear Differential Casting Number -- How to Decode??
Not much. If you really want to know what gear ratio your truck came with and what sort if any traction device it has, just change the fluid. Chances are the 50 yr old truck needs a fluid change anyhow.
__________________
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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12-06-2015, 01:41 PM
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#5 |
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Registered User
Join Date: Oct 2008
Location: los angeles, ca
Posts: 926
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Re: Rear Differential Casting Number -- How to Decode??
Bump. Anyone?
Thanks! |
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12-12-2015, 11:29 PM
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#6 |
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Registered User
Join Date: Oct 2008
Location: los angeles, ca
Posts: 926
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Re: Rear Differential Casting Number -- How to Decode??
Code is --
RHA W238 2 I believe this is a '72 3.07 rear and is original to the truck |
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12-12-2015, 11:38 PM
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#7 | |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,404
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Re: Rear Differential Casting Number -- How to Decode??
Quote:
You would be correct. Here are the ratio charts: http://67-72chevytrucks.com/vboard/s...d.php?t=578793 LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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12-13-2015, 07:46 PM
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#8 | |
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Registered User
Join Date: Oct 2008
Location: los angeles, ca
Posts: 926
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Re: Rear Differential Casting Number -- How to Decode??
Quote:
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