engine and trans pad stamps

**black69** · #1 11-20-2015, 07:05 PM

Did GM use the same stamp for the trans as they did for the VIN on the engine?

I am assuming they did, like mopar, but had to ask.

I recently noticed a difference on a post 1970 car that made me wonder.

**Mr70** · #2 11-20-2015, 08:46 PM

Yes Chevrolet did.

**black69** · #3 11-20-2015, 11:07 PM

thanks. I recently got confused when I saw the 1's characters on a survivor car, block vs trans. The 1s on the trans looked more like vertical lines. thanks.

**Stefano** · #4 11-23-2015, 06:18 PM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mr70</div><div class="ubbcode-body">Yes Chevrolet did. </div></div>

Yes, generally they did. But with so many plants and models, there have been anomalies found.

**black69** · #5 11-24-2015, 01:25 PM

Hi Stephano, now that you responded, when I looked at the 74 454 vette you had listed forsale, it was the trans stamp that made me wonder about the top of the 1's. It sure looks like it was the same stamp on everything else. Thanks!

**Day2_69Z** · #6 11-24-2015, 02:46 PM

Here are Examples of Factory Stampings.

First is the Original Muncie , late build,
10 C & 661 case with drain and fill.
69 Z/28. M 21.
the '777' vin stamp is Actually *111*

Second is an NOS 302 Engine Assembly
From the Flint Michigan engine plant.
Note Date # 7 & letter capital I in lieu
of 71

**Day2_69Z** · #7 11-24-2015, 03:58 PM

70 copo · #8 11-24-2015, 04:43 PM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: black69</div><div class="ubbcode-body">Did GM use the same stamp for the trans as they did for the VIN on the engine?

I am assuming they did, like mopar, but had to ask.

I recently noticed a difference on a post 1970 car that made me wonder.

</div></div>

Yes.... and there were anomalies that were related to the production process as well.

**black69** · #9 11-24-2015, 04:47 PM

I understand the character substitutions mentioned (7 for a 1 in the one example, and I for a 1 in the other example). But shouldn't the substitutions of characters be same on block and trans if using the same stamp?

70 copo · #10 11-24-2015, 04:53 PM

Yes, unless the engine or transmission was replaced as part of an in plant repair at AGR. Then another set of stamps could have been used along with alternate stamping locations.