CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: samanatoo on August 25, 2008, 11:38:58 PM

Title: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: samanatoo on August 25, 2008, 11:38:58 PM

My  Z28 has a 2nd week of August build so could this be the cars original axle?? How close do the casting dates run to the cars build on rear ends??? 

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: L78 steve on August 26, 2008, 03:25:25 PM

That's quite a spread,Do you have the protect-o-plate ?I have a Nova that has long spread but the POP verifies it .

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: Jerry@CHP on August 26, 2008, 04:43:05 PM

Gear ratios can also deteremine the time window on these cars.

Jerry

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: samanatoo on August 26, 2008, 11:22:22 PM

 The axle code Jerry is   PC 1129 G (3.31, nin posi, Nov. 29th, Detriot) Right?              K 21 8 is the cast date         3894860N cast number thanks     

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: KurtS on August 27, 2008, 02:47:07 PM

That's a 67 axle, so a little too early for your car. ;)

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: samanatoo on August 28, 2008, 12:50:38 AM

K 21 8   stand for  K being November, 21 the day, and 8 being 1968??

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: KurtS on August 28, 2008, 06:13:18 AM

PC in 69 is a 2.56 10 bolt.
The 8 in the date is probably a 6.

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: samanatoo on August 28, 2008, 10:52:47 AM

PC code for  Non - posi Axle was for 12 bolt 69 cars I found the info on this site last week, but i will check the number 9 again, it is easy to read because the axke has non dirt or grime and fresh paint thanks! I will check it again. 

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: lakeholme on August 28, 2008, 01:03:46 PM

Samanatoo,
Decoding can be confusing... and Chevy and their suppliers used interesting and varying systems of id...

You have to read the chart all the across on the CRG Drivetrain Decoder.  The 69 #s are in the right hand columns.  Look here:

http://www.camaros.org/drivetrain.shtml#AxleCodes

Colvin verifies Kurt's decoder about 69 PC axle on page 314 of Chevrolet By the Numbers, 1965 - 69.

Kurt,
Thanks for what you and all CRG do!  This thread made me go back and re-read your decoder info. again.  I learned quite a bit!

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: samanatoo on August 28, 2008, 05:51:08 PM

I see what you mean in the far right colum and it goes by model year for the car not the calender tear. I just looked at the number 8 and it sure does look like an 8 but I guess it could be a 6, but it looks more like an 8. So they did make this PC code axle for 1966???

Title: Re: 1969 Z28 casting date on my 12 bolt is Nov 29 1968. Could be cars original rear?
Post by: KurtS on August 29, 2008, 05:53:55 PM

http://www.camaros.org/geninfo.shtml#ModelYear