VCCA Home Forums TECHNICAL - 1945 AND NEWER 1955-1957 Casting numbers Identification Truck Rear End

Hi All,

Does anyone know if you can tell, just from the casting number on a third member, if it came out of a truck, or a passenger car? In looking at the internet sites, I can't find an answer to my question. Is there a different number sequence for one or the other?

Thanks for any feedback....

Bob

Yes. post the number.

Thanks Chev Nut...I will put it on tomorrow...appreciate your help at that time...

Bob

Hey Chevgene, here is what is on the third member....

3707306

GM19

295

Hope this helps...thanks again,

Bobalouie

I found it after looking back through four part number changes. If it has that number it originally was from a 1955-56 passenger car//Corvette. The newer replacement number covered back from 1964 to 1955.

Chevgene,

Thanks very much for the info...this is why I am confused..I
bought it as a passenger car 3rd member, and when I went to have a new ring and pinion on it, the shop said that it was a truck rear end, not a passenger car. I trust the guy I bought it from and was glad to hear your opinion...any more info. on the part changes...was that just the evolution of them...?

Thanks again, Chevgene!

Bobalouie

The demensions were the same but they were made stronger as the later, larger, more pwoerful engines came along.

the 56 and 57 corvette differential housing casting #'s were 3725899 for 56 and 57 non-posi and 3743833 for the 57 posi's(posi's weren't available for the 56 model year vettes).mike

Thanks to both Mike and Chevgene...

Bobalouie