'65 Formula S with "factory" 727 and 8 3/4?

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toolmanmike said:
Same as mine Axle code: 404 Sure grip: 4088. The sure grip code is 408 and they just put an 8 in the box.
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40"4"= 3:23 gear ratio
40"8"= sure grip
Neither indicate size of ring gear.
To know which rear was installed at the factory, check "axle" under the build code section of a build sheet. For my 66 with 3:23 sure grip, the build code is 011 and it is a 7 1/4" rear. Someone with a factory 8 3/4" A body car, please post that number.
 
pbiggs said:
40"4"= 3:23 gear ratio
40"8"= sure grip
Neither indicate size of ring gear.
To know which rear was installed at the factory, check "axle" under the build code section of a build sheet. For my 66 with 3:23 sure grip, the build code is 011 and it is a 7 1/4" rear. Someone with a factory 8 3/4" A body car, please post that number.
Click to expand...
Wow, good thing you mentioned that. I had to get a magnifying glass out to see it but the axle is #178 and the pinion # is 34.
17 834 or 17 8 3/4 I would imagine. The codes aren't in the option code book that I can find.

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toolmanmike said:
Wow, good thing you mentioned that. I had to get a magnifying glass out to see it but the axle is #178 and the pinion # is 34.
17 834 or 17 8 3/4 I would imagine. The codes aren't in the option code book that I can find.

View attachment 1715436469
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Thank you for posting.
Quoting Govier's 1991 Parts Interchange Book: build code (not sales code) 011 is 1966 A-body 3:23 SG 10" brakes 7 1/4" rear end
178 is 1966 A-body 3:23 SG 10" brakes 7 1/4" rear end
Govier does not list an A body 8 3/4" rear until 1967 and the build code then is 614 non SG and 615 SG w/ 10" brakes. Doesn't mean there was none, just it's not in his book.
I have no idea why the same rear in 1966 A-bodies would have different build codes for the apparently same rear end. Perhaps Mr. Grovier amended a later printing if error were made.
Go figure.

Also FYI, "pinion" under build code was the speedometer pinion gear #, not the rear end pinion or ring gear diameter.
 
pbiggs said:
Thank you for posting.
Quoting Govier's 1991 Parts Interchange Book: build code (not sales code) 011 is 1966 A-body 3:23 SG 10" brakes 7 1/4" rear end
178 is 1966 A-body 3:23 SG 10" brakes 7 1/4" rear end
Govier does not list an A body 8 3/4" rear until 1967 and the build code then is 614 non SG and 615 SG w/ 10" brakes. Doesn't mean there was none, just it's not in his book.
I have no idea why the same rear in 1966 A-bodies would have different build codes for the apparently same rear end. Perhaps Mr. Grovier amended a later printing if error were made.
Go figure.

Also FYI, "pinion" under build code was the speedometer pinion gear #, not the rear end pinion or ring gear diameter.
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"pinion" Damn, I thought I was onto something. LOL I find the Galen pocket books pretty frustrating. The print is way too small. My bifocals just don't pick up all the details and Like in school, if I read a page I don't retain the info. Thanks for pointing that out. I never noticed that info in the parts book. I have the 1991 and the 2013 book here within arm's reach.
 
Perhaps somebody with a D/Dart broadcast sheet could chime in. Those are the only early A-bodies that there is no doubt as to what rear end was factory installed. Actually, I think I may have a copy of one. I'm looking right now.
 
Interesting. 408 is still Sure Grip. 409 is special order rear gear. @ddartdude knows I bet.
 
Jim Lusk said:
I think so. Now we need to see a late '66 standard four barrel four speed car to see what it says. Unfortunately the axle info is right where the seat spring was.
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Mine is a December car. Post #52
 
pbiggs said:
40"4"= 3:23 gear ratio
40"8"= sure grip
Neither indicate size of ring gear.
To know which rear was installed at the factory, check "axle" under the build code section of a build sheet. For my 66 with 3:23 sure grip, the build code is 011 and it is a 7 1/4" rear. Someone with a factory 8 3/4" A body car, please post that number.
Click to expand...
66 Barracuda 4 speed 273 2V 8 3/4 suregrip. Pretty sure it's 138.
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ddartdude said:
D/Dart broadcast sh


The axle is #999 and the pinion is #99. From another D/Dart broadcast sheet.
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Makes sense. Many of those build sheets are quite hard to read. Along those same lines, fender tags can be almost unreadable if rusted bad. Flip it over and take a sharp photo of the backside and I can invert the image to make it readable.
 
toolmanmike said:
Lucky to own a couple D Darts and even with a build sheet.
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I've been hunting for D/Dart info since late 1986. I had just purchased a 1964 Valiant and wanted to put headers on it. Found out that the D/Dart headers were the only non-fenderwell headers that would fit. I was working in Chrysler Engineering in Highland Park at the time so some info was easy to acquire.
 
ddartdude said:
I've been hunting for D/Dart info since late 1986. I had just purchased a 1964 Valiant and wanted to put headers on it. Found out that the D/Dart headers were the only non-fenderwell headers that would fit. I was working in Chrysler Engineering in Highland Park at the time so some info was easy to acquire.
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That's interesting. I didn't know that about you. Insider information! LOL
 
I had a thought. We should let this thread run it's course but I may be able to move the D Dart information posts to it's own thread. If you wish and think it's a good idea.
 
If someone is searching for D Dart information it will come up as long as they don't activate the "search titles only " box.
 
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