Re: '69 Turbo 400 code?
1969 Corvettes that were available with the THM 400 automatic transmission used one of three codes: CK for base engine applications (ZQ3), CL for hydraulic lifter 427 applications (L36 and L68), and the CY for solid lifter 427 applications (L71, L89, L88, and ZL1). To the best of my knowledge, the CY and CX coded THM 400s were practically identical... Revised valve body with higher shift points, fully welded torque convertor, six attaching bolts for the torque convertor, etc. In addition, Corvettes equipped with the CY automatic also received a special AX or CAX (depending upon when the car was built) code 3.36 to 1 ratio rear axle as the "performance ratio". I know of one L88/M40 that is said to have a 2.73 rear, but every other car that I have seen or know about has a 3.36. Nothing numerically higher was listed which is odd considering the fact that MANY Camaros and Chevelles with the CX transmission had 4.10s. For whatever reason, the automatic was never received well in the high horsepower Corvettes and as a result, very few were built. Resale on these 1969 cars is still substantially less than a comparable four speed car with the same engine and can be real bargains if you are able to find a nice one.
This CY transmission was also used behind 1971 LS6 Corvettes and was planned for use with the 1970 LS7 Corvette if it had been released for sale. As with the 1969 version, a 3.36 rear axle ratio was the highest numerical ratio listed.
I am not aware of any other application for the CY transmission... I guess that it would be possible, but I have not heard of any such usage outside of Corvettes.
What additional information were you looking for?
Regards,
Stan Falenski
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