'69 Turbo 400 code?

[Rowdy Rat]

Joe,

As far as Corvettes, I can tell you that the "CY" code THM 400 was only used behind the solid lifter big blocks in 1969; it was not offered as an option in 1968 for use with the L71/L89/L88. I'm also curious as to the 335hp 427 application you listed. Why would a low rpm utility engine need a high rpm shift point automatic?

Your description of the "CY" code automatic for the 1968 COPO Novas sounds quite a bit like the Corvette unit in 1969... 6200-6400 rpm full throttle upshifts.

William,

Your comments regarding different part numbers for the case and valve body were enlightening... I had always been told that the Corvette "CY" and Camaro/Chevelle "CX" automatics were nearly identical. If it isn't too much trouble for you to look them up, I would be very interested to learn what the part numbers for "CX"/"CY" transmissions were for the torque convertor, valve body, and case. I would appreciate any information that you can provide.

Regards,

Stan Falenski