Help 56 Rear End ID

[Jim K.]

I need help in identifying the rear end in my 56. Here are the cast #'s on the LH face of the pumpkin : 3707306 D56 . The stamped #'s on the RH side are: AE 4 12 . The 56/57 JM says the 56 casting # should be 3725899 (standard) or 3743833 (posi). Thanks , Jim

[Gary C.]

Re: Help 56 Rear End ID

Jim, the 306 number is correct for '56. The 5th edition 56-7 JM error was realized to late to correct before printing. An addendum is being worked on. Gary....

[Jim K.]

Re: Help 56 Rear End ID

Gary; Thanks for your "good news" reply. I kind of thought I had the original rear end, the casting and stamped dates on the pumpkin (April 56) are in line with my mid may assembly date. Are there any other 56 owners out there with this "306" casting # ? Thanks again, Jim

[Tom P.]

Re: Help 56 Rear End ID

Jim, the 306 number is correct for '56. The 5th edition 56-7 JM error was realized to late to correct before printing. An addendum is being worked on. Gary....

Oh good grief!!!! Are you kidding?

The 306 casting number is common to all 56 pass cars and Vettes. I've seen numerous rears out of 56 pass cars without the stamped ratio code/assembly date. Thus, a rearend center case without the stamped code would make a good replacement, if necessary.