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My information shows the 1969 427/335HP Chevrolet as getting the CQ Suffix.Not the CY.It states this code for only that L-36 engine.<HR></BLOCKQUOTE>
That certainly makes a lot more sense...
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The CX was the trans.in the letter dated 7/12/68 in Colvins book.It was used,as the letter states,in 1969 Special Hi-perf Engine Novas,Chevelles,Camaros,Chevrolet,and Corvette.It looks COPO specific and L-72 Impala or Corvette L-71 and up also got it.
I have seen the CX in a 69 COPO chevelle with a 4:10 Posi.I believe it was specific to these rear ratio cars in 1969.
In 1970 the CY was the trans.of choice for the Hi-perf LS-6 engine.All the LS-6 M40 buildsheets have the CY code available with ANY rear ratio.Not just 4:10.Although I think the 1970 Corvette could get the CX still.Any Corvette documentation out there to prove this?<HR></BLOCKQUOTE>
I've had the opportunity to look at quite a few 1969 Corvettes equipped with the high performance engines (L71, L89, and L88) and automatic transmission. Without exception, they have all had a "CY" code. If "CX" was somehow linked to a 4.10 rear axle ratio, that would certainly explain why the Corvettes didn't receive it. As I mentioned previously, the highest numerical ratio that could be ordered with the big block and automatic transmission was 3.36; the high performance 427s received a "special" differential with its own code of "AX" (or "CAX" depending upon how late in 1969 the car was built). As far as 1970, my understanding is that had the LS7 Corvette gone into production, it would have used the "CY" transmission along with the same "CAX" rear axle (at least the power team chart for 1970 Corvettes show a 3.36 ratio as the "performance" axle with the the LS7/M40 combination).
You and Joe both touched on a possible transmission - rear axle relationship... Could this have determined which was used for a given application?
Regards,
Stan