Decode my rearend please..
Thread Starter
Pro
Joined: Sep 2006
Posts: 551
Likes: 2
From: Clovis CA
Decode my rearend please..
Can someone help me decode my differential. I found two sets of numbers/letters,here they are as best as I could read them.
On the back upper is 3871375, on pass side is K or R A8 or 48, really hard to read that one. Ant others to look for?
On the back upper is 3871375, on pass side is K or R A8 or 48, really hard to read that one. Ant others to look for?
Le Mans Master
Joined: Nov 2001
Posts: 8,780
Likes: 1,936
From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
Originally Posted by 68RATVT
Can someone help me decode my differential. I found two sets of numbers/letters,here they are as best as I could read them.
On the back upper is 3871375, on pass side is K or R A8 or 48, really hard to read that one. Ant others to look for?
On the back upper is 3871375, on pass side is K or R A8 or 48, really hard to read that one. Ant others to look for?
68-69 rear end CODES:
AK= 3:36 SB
AL= 3:08 P SB
AM= 3:36 P SB
AN= 3:55 P SB
AO= 3:70 P SB
AP= 4:11 P SB
AS= 3:70 P SB
AT= 3:08 HD P 427 " MINE" 427 / 400 TRI POWER 1968 4SPD
AU= 3:36 HD P 427
AV= 3:08 P 427
AW= 3:08 HD P 427
AX= 3:36 HD P THM 427
AY= 2:72 HD P THM 427
AZ= 3:55 HD P 427
FA= 3:70 HD P 427
FB= 4:11 HD P 427
FC= 4:56 HD P 427
LATE 69 TO 70 USED 3 LETTERS ALL STARTING WITH A "C"
SB = SMALL BLOCK
HD = HEAVY DUTY
P = POSI
THM = TURBO HYDROMATIC
Last edited by 427SIXPACK; Dec 7, 2006 at 10:13 PM.
Racer
Joined: Feb 2006
Posts: 433
Likes: 0
From: Show me a cold beer and I will show you a happy man Maryland
not a pro, just trying to help so dont flame me...In my book I have it should read a number like AK 0621 W. The first letters determine ratio as follows
AK 3.36 not posi
AL 3.08 posi
AM 3.36 " "
AN 3.55 " "
AO 3.70 " "
AP 4.11 " "
AS 3.70 not posi
AT 3.08 H.D. posi
AU 3.36 H.D. posi
AV 3.08 posi
AW 3.08 H.D. posi
06 21 would be month and day of production an W is warren plant.
think you need to get the rest of the #s
Hope this will help you out....
AK 3.36 not posi
AL 3.08 posi
AM 3.36 " "
AN 3.55 " "
AO 3.70 " "
AP 4.11 " "
AS 3.70 not posi
AT 3.08 H.D. posi
AU 3.36 H.D. posi
AV 3.08 posi
AW 3.08 H.D. posi
06 21 would be month and day of production an W is warren plant.
think you need to get the rest of the #s
Hope this will help you out....
Racer
Joined: Feb 2006
Posts: 433
Likes: 0
From: Show me a cold beer and I will show you a happy man Maryland
Originally Posted by 68RATVT
Huh? Am I looking for a differant number somewhere else..
Oh...dont forget the 6 pack
Last edited by James.70; Dec 7, 2006 at 10:20 PM.
Le Mans Master
Joined: Nov 2001
Posts: 8,780
Likes: 1,936
From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
Originally Posted by 68RATVT
Huh? Am I looking for a differant number somewhere else..
THOSE CODES ARE STAMPED ON THE BOTTOM OF THE REAR END DIFF CARRIER JUST FORWARD OF THE REAR END COVER.
YOU WILL NEED THE CAR IN THE AIR TO VIEW THIS.
68-69 PRODUCTION CODES CONSISTS OF A NUMBER FOR THE SHIFT THAT PRODUCED THE UNIT, 2 OR 3 LETTERS THAT ARE THE RATIO CODE THE DATE PRODUCED MONTH/1-12/DAY/YEAR AND A SUFFIX LETTER FOR THE PLANT THAT PRODUCED THE DIFF.
PLANTS B=BUFFALO, D=DANA, E=EATON, G=CHEV.
GEAR & AXEL K=MCKINNION
POSI SOURCES E=EATON, W=WARNER, D=DANA
Le Mans Master
Joined: Nov 2001
Posts: 8,780
Likes: 1,936
From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
Originally Posted by 68RATVT
Dosn't the rear spring and/or the strut rod bracket cover them?
NOPE!
USUALLY NEED TO CLEAN / DEGREASE AS PREVIOUSLY STATED
A.K.A
"WIPING YOUR REAR END !!!
Last edited by 427SIXPACK; Dec 7, 2006 at 10:46 PM.
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