Best sources for decoding build sheet

[Jim’s Dodge]

I am new to this site. Own a ‘67 Coronet and starting some rebuilding of brake system. What are best sources for decoding the “2” and “624” on the build sheet for the axle? There has to be sources out there I can use.

Thanks in advance for your help.

 

[MarkLevi]

If you scroll down the Forums list here, you'll get to either "Eng/Trans/Driveline" or further, "Brakes/Steering/Suspension". Either of these would be where to ask your car-related questions regarding your brakes/axle(s)

M

2/9 Edit content as I see this thread has been relocated.

 

[WileE]

Welcome to the site, you'll find the knowledge and experience here outstanding.

 

[MarkLevi]

@Jim's Dodge
Let's bump you back up here for some visibility. Talking about your "2nd" item first:
Tho it was moved here, you should probably still re-post your question about the "624" axle build code in one of the technical forums. That number references an internal sub-assembly number that encompasses numerous other parts/components specific to models/engine/equipment, and was used to stage the assembly lines with what they'd need. Whereas an xxxx 624 number undoubtedly existed in Mother Mopar's Item Master (and thereby generating its own bill of materials, routing, and costing data), it's not a "catalog number" that could have ever been purchased anywhere. I don't personally have any reference to that particular assembly number, but maybe others on here do and will share if they see it in an appropriate forum (documentation for many of them exist/are known). To that end, when you re-post, I would also suggest that you also post a hi-res, legible image of your broadcast sheet in question and, at the very least, we can try to reverse-engineer through it with you (and we all learn something along the way).

For your "1st" item - the "2": - that's more straightforward. It is the last digit of a sales code - "402" defining an axle gear ratio. If your axle ratio was, instead, to be 3.23:1, the digit "4" would have printed in that box. You'd think that would be one-and-done, but even then, Ma Mopar doesn't necessarily pin it down without looking at 'adjacent' factors. I used a 1968 Coronet ordering info chart (lifted from Hamtramck Historical) because it shows a couple of these kinds of decoding nuances. You'll see "402" can actually refer to two different gear ratios that are a function of two different sized ring gears/tooth counts. Further, if you look at the 406 in the chart, you'll see two ratios, two ring gear sizes, and in that instance, one is a Mopar Axle and the other is a Dana (with a 9-3/4" ring gear). So, the car's year/model/engine/trans all trickle down into specifics. Clear as mud, no?

**a quick edit in that I believe I annotated the 402/2.93 incorrectly below - I think it was actually a 7-1/4" ring gear**