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Old 09-28-2011, 06:35 PM
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What rear-end do I have?

I have a 56 chevy truck that Im restoring with my dad, and im slowly learning my way in rebuilding. We were told by the guy we bought the truck from that it had a different rear end, but he wouldnt say what it was... It is a 12 bolt rear end, and here is a pic (just one off google that i edited) of what the casting numbers are, and where they are at. If anyone could help me identify my rear-end that would be great.

Oh and its not posi.




A- H218 or H278 (hard to tell 7 or 1)
B- CON1 or CONI (hard to tell I or 1)
C- 1 2 3 4 5
6 7 8 9 0
D- L1
E- HA 09 16 W 2
F- NF 3896838
G- GM55

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Old 09-29-2011, 09:47 AM
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umm a big one...?
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Old 09-29-2011, 09:59 AM
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Does that one have one of those horns for backing up?
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Old 09-30-2011, 08:57 AM
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The answers were funny, but not much help.

Maybe someone else could help this guy.

Thanks !


454 RATTLER
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Old 09-30-2011, 10:08 AM
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Take a picture of your rear cover.. It's either gonna be a GM 12 bolt car or 12 bolt truck. Are you trying to ID it for Parts or?
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Old 09-30-2011, 10:14 AM
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Quote:
Originally Posted by ericrcan
I have a 56 chevy truck that Im restoring with my dad, and im slowly learning my way in rebuilding. We were told by the guy we bought the truck from that it had a different rear end, but he wouldnt say what it was... It is a 12 bolt rear end, and here is a pic (just one off google that i edited) of what the casting numbers are, and where they are at. If anyone could help me identify my rear-end that would be great.

Oh and its not posi.
A- H218 or H278 (hard to tell 7 or 1)- Date code for Aug. 21 or 27 of a year ending in "8". Probably 1968.

B- CON1 or CONI (hard to tell I or 1)- Foundry code.

C- 1 2 3 4 5 6 7 8 9 0- No idea.

D- L1- No idea.

E- HA 09 16 W 2- Ratio code, posi or not, possibly other info. "HA" is for a non-posi 3.73:1 ratio, but you should CHECK to be sure.

F- NF 3896838- casting number. I can't say all the applications this casting number was used on, but 1967-'72 Chevy C-10 trucks used it. Likely a wider range of years than this, but these two were the furthest apart I found while doing a quick look. Should have a 12-bolt cover.

G- GM55- Foundry code.

Last edited by cobalt327; 09-30-2011 at 10:42 AM.
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Old 10-01-2011, 03:53 PM
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Ok, so I have found out its a 12 bolt truck rear end, and doing a calculation, it confirmed that it is a 3.73:1 rear end. This leads me to 2 more questions. This is in a 1956 chevy truck with a 350 hp 327, and a 700r4. What gear ration should be good for this setup as a daily driver? I heard that 3.73 is, but then that brings me to my next question. Does anyone have information about converting to a posi-traction? Thanks!
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