Rarity??

[Chris Lowe (31292)]

How many 69 coupes were made with the 435 and auto trans??? Have a person trying to sell one to me that he claims there were only 80 made. Thanks

[Ralph Spears (8296)]

Re: Rarity??

I have heard 250 were built. I own one.

[Steven Cullen (46423)]

Re: Rarity??

255, described in a letter from GM and a Corvette Fever article. I also have one. Unusual "CY" coded transmission, only automatic available for L71, L89, L88, and I think one of the ZL1...

Steve

[Steven Cullen (46423)]

255 Coupes plus Convertibles

I've never seen a breakdown of the 255 into coupes versus convertibles. You could do the old assumption based on body type split of about 50%-50%...

Steve

A rare setup anyway you look at it.

[Bill Stephenson]

Re: 255 Coupes plus Convertibles

------Put a gear (preferably 4:56) in that thing, loosen up the torque converter a bit and hang on for dear life. An old friend had one of these way back and it could not be beat on the street. The thing was ferocious!!! One of these is on my short-list........Bill S

[Warren Friedrich (12139)]

Re: Rarity??

Steve,

The LS-6 could have been ordered with that special TH400 transmission as well. Currently we have identified 14 of the 188 cars as being optioned with it.

[John Hinckley (29964)]

Re: 255 Coupes plus Convertibles

The "CY" trans ("high shift point") was also used on the '71 LS-6 auto.

[lyndon sharpton]

Re: Rarity??

what is different about the trans on the inside? does it have a different valve body?

[John Hinckley (29964)]

Re: Rarity??

A neighbor of mine has an all-original '71 LS-6 THM-400; here's a photo of the THM tag from it.

[Michael Hanson (4067)]

Re: 255 Coupes plus Convertibles

The "Hydra-Matic Systematic Trouble Shooting" manual from GM in about 73 shows that the "CY" was used from 69 to at least 73. Unfortunately, it doesn't give model identification or usage. Incredible amount of differences for clutch disc count, composition, piston and return spring part numbers etc etc. I believe the CY was the only unit that used a 6 clutch pack for the direct clutch, instead of the usual four or five. Also, there were no wave/cushion steel clutch plates. All were flat which added to the firmness of the shift. All of the unique part numbers for the 6 disk clutch and unique piston are listed but I'm pretty sure none of these numbers are available today.

Basically, the same applies to the forward and intermediate clutch packs for the CY unit. More unique part numbers and clutch count.

If I remember correctly, the control body was also unique to the "CY".

[lyndon sharpton]

Re: Rarity??

Nice.