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Topic: 1969 Rear Differential Removed For Rebuild

in Forum: C3 Driveline Components

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Re: 1969 Rear Differential Removed For Rebuild (2/12)
3/26/17 10:57pm

Ole Biker
Former Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 71

Squirrels had used the crossmember to store corn and nuts and all the stuff fell out when crossmember was separated from the differential!!

|UPDATED|3/26/2017 7:57:17 PM (AZT)|/UPDATED|

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Re: 1969 Rear Differential Removed For Rebuild (3/12)
3/26/17 11:01pm

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Re: 1969 Rear Differential Removed For Rebuild (4/12)
3/27/17 1:20pm

Vman73
Former Member
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 405

Good job Mike, now is the time to do it with the trailing arms out and you're certainly making it look easy !! While your cleaning up the differential case, look for casting dates on the case halves to validate your diff. One is on the drivers side just behind the input shaft. The other is on the cover, very close to the full/drain plug. Let us know what you find,

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John Sigmund

valkman57@sbcglobal.net

NCRS Member 61302

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Duct tape is the new Black !!

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Re: 1969 Rear Differential Removed For Rebuild (5/12)
3/27/17 10:21pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Ole Biker said:

Diff # info

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Joel Adams
C3VR Lifetime Member #56
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Re: 1969 Rear Differential Removed For Rebuild (6/12)
3/29/17 12:35pm

Vman73 said: Good job Mike, now is the time to do it with the trailing arms out and you're certainly making it look easy !! While your cleaning up the differential case, look for casting dates on the case halves to validate your diff. One is on the drivers side just behind the input shaft. The other is on the cover, very close to the full/drain plug. Let us know what you find,

Hello!

Prior to taking the differential to Bair's I was able to garner the stamping at the bottom of the case. I did not look at the casting numbers before dropping off at the shop. At the disassembly at Bair's the Tech was able to confirm the ring and pinion numbers matched the build date of my car. More comforting news on my part.

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Re: 1969 Rear Differential Removed For Rebuild (7/12)
3/29/17 12:52pm

Adams' Apple said:

Ole Biker said:

Diff # info

Great pictures on that link! Valuable information to all.

The stamped code on the bottom of the differential case matched the ratio of the ring and pinion inside the case. 3:55 ratio. Dates on ring and pinion match the case dates.

Thanks,

Mike C

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Re: 1969 Rear Differential Removed For Rebuild (8/12)
5/21/17 7:48pm

Hello!

A picture of the finished rebuild of the rear suspension.

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Re: 1969 Rear Differential Removed For Rebuild (9/12)
5/21/17 8:02pm

|UPDATED|5/21/2017 5:02:47 PM (AZT)|/UPDATED|

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Re: 1969 Rear Differential Removed For Rebuild (10/12)
5/22/17 2:18pm

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Re: 1969 Rear Differential Removed For Rebuild (11/12)
6/1/17 2:12pm

Hey Mike, I don't have a quick reference to the diff casting number you posted above, I'll do some digging. The casting date B249 does decode to Feb. 24th 1969 which is perfect for your March '69 car if I'm remembering your build date correctly. Though it might be too late since you have the diff installed, there is another casting date for the diff rear cover. It's located in the vertical position just above and forward of the fill plug. Your cover is probably original, but many got replaced because the ears that the spring bolt to like to break off. A lot of covers also got replaced with a stronger aftermarket casting with a larger flange that prevented the problem. Looks great !!

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John Sigmund

valkman57@sbcglobal.net

NCRS Member 61302

NW NCRS Chapter Member

Duct tape is the new Black !!

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Re: 1969 Rear Differential Removed For Rebuild (12/12)
6/5/17 3:18pm

Vman73 said: Hey Mike, I don't have a quick reference to the diff casting number you posted above, I'll do some digging. The casting date B249 does decode to Feb. 24th 1969 which is perfect for your March '69 car if I'm remembering your build date correctly. Though it might be too late since you have the diff installed, there is another casting date for the diff rear cover. It's located in the vertical position just above and forward of the fill plug. Your cover is probably original, but many got replaced because the ears that the spring bolt to like to break off. A lot of covers also got replaced with a stronger aftermarket casting with a larger flange that prevented the problem. Looks great !!

Thanks!

The car has a July build month I believe.

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