Diferential Numbers ID

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Jun 25, 2011 | 08:43 AM

BuffaloBILL

Thread Starter

Pro

Joined: Mar 2006

Posts: 623

Likes: 2

From: Sugar Land Texas

Diferential Numbers ID

Hey gang

Dropped the rear end on the 66 last night Can someone ID the numbers on the housing for me?

AN 4-21-66 IS THIS THE BUILD DATE?

Also numbers 3871375 and 3878478 N

Any assistance would be appreciated
Thanks
Buffalo Bill

Jun 25, 2011 | 10:52 AM

ricks327

Race Director

Joined: Sep 2005

Posts: 13,860

Likes: 1,870

From: Birmingham Mi

Here are the numbers and decode for my 67 rear end. Don't have my book handy but you are on the right track.

AM 6 5 67 (AM= 3.36:1 Positraction , 6 5 67 =date of June 5, 1967 )

Rick

Jun 25, 2011 | 10:59 AM

65GGvert

Team Owner

Joined: Jul 2006

Posts: 22,190

Likes: 4,178

From: Kannapolis NC

3:55 built 4-21-66

AK 3.36:1 Standard Manual Transmission or Powerglide (327)
AL 3.08:1 Positraction 4-Speed (327)
AM 3.36:1 Positraction Manual Transmission (327)
AN 3.55:1 Positraction 4-Speed (327)
AO 3.70:1 Positraction 4-Speed (327)
AP 4.11:1 Positraction 4-Speed (327)
AQ* 4.56:1 Positraction 4-Speed (327)
AR* 3.08:1 Standard Wide-Ratio 4-Speed (327)
AS 3.70:1 Standard Close-Ratio 4-Speed (327)
AT 3.08:1 Positraction 4-Speed (396/427)
AU 3.36:1 Positraction 4-Speed (396/427)
AZ 3.55:1 Positraction 4-Speed (396/427)
FA 3.70:1 Positraction 4-Speed (396/427)
FB 4.11:1 Positraction 4-Speed (396/427)
FC 4.56:1 Positraction 4-Speed (396/427

Jun 25, 2011 | 11:13 AM

5thvet

Le Mans Master

Joined: Apr 2006

Posts: 5,347

Likes: 36

From: San Clemente CA

I didn't think there was a year designation after the month and day. I thought after the day was the plant designation ( W-Warren etc)?