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Username Post: REAR END ID        (Topic#228279)
Senior Member
Posts: 496

Age: 77
Loc: Selah, Wa. Silver Member
Reg: 01-10-02
10-23-09 03:19 PM - Post#1793246    

After taking my 56 Chev Tudor body off the frame I found a strange rear end under the car. The numbers are GM63 3894859 NF. The rear cover has a strange looking bulge resembling a walrus face. It isn't curved like the normal 10 bolt GM rear end. I can see where the leaf spring brackets have been welded to it and some other brackets have cut off. Does anyone have an Idea what it could out of?
409 Willy


Dedicated Member
Posts: 5351
Age: 66
Loc: Everett, Wa.
Reg: 02-26-08
10-23-09 03:26 PM - Post#1793253    
    In response to 409_Willy

"Brackets" for leaf springs would mean Nova, Camaro, and the like. 8.2" ring gear style cover; same basic covers used on the earlier 12 bolts also. Butch/56sedandelivery.

Dedicated Enthusiast
Posts: 6514
Age: 56
Loc: Kansas
Reg: 02-16-03
10-23-09 03:29 PM - Post#1793256    
    In response to 409_Willy

Here is a lil' info that I dug up real quick and maybe help you get started.

The casting number, 3894859nf, identifies the axle as a 10-bolt from either a 68-69 Chevy II (Nova) or 67-69 Camero since both had the same casting number. For the axle to be a 12-bolt for a 67-69 Camero the casting code would be 3894860nf, which is also the same casting number for the 68-69 Chevy II. There should also be a seven digit number on one of the axle tubes that will further identify the year, month and day of manufacturer, gear ration and plant were it was made. I could not read very well the numbers on the picture, however from the data provided, it does not appear you have a 12 bolt rear end.

Regards, Jeff

1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

Don't have a nervous come together!


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