69 SB to BB
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Joined: Oct 2019
Posts: 97
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69 SB to BB
This is my 69 (formerly SB) car. It was a 350 automatic and am staying automatic but went to a 400. Question is, do I need to swap out crossmember to a 400 or aftermarket one or can I just use the 350 one already in it? Secondly, is the driveshaft. I have swapped over to the 400 yoke. Can I use this same shaft lengthwise or is something neccessary to make it work? I was told its fine the way it is. Thought I would ask your thoughts.
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
I am under the impression all corvettes came with the TH 400 auto. There was no difference in frames except for a manual or auto. The difference was the auto had a removable crossmember.
Team Owner
Joined: Jul 2004
Posts: 40,368
Likes: 787
From: Redondo Beach, California
I think the auto frames were missing the little tab welded onto the frame to support the clutch Z bar shaft. Astounding that GM would be so cheap to make seperate frames for the autos and manuals. How much extra would it have cost to make all frames with a removeable crosssmember and the little clutch shaft support tab? A removeable crossmember is equally needed for a manual tranny. On an assembly line, it'd cost almost nothing to weld on the clutch support tab.
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
I think the auto frames were missing the little tab welded onto the frame to support the clutch Z bar shaft. Astounding that GM would be so cheap to make seperate frames for the autos and manuals. How much extra would it have cost to make all frames with a removeable crosssmember and the little clutch shaft support tab? A removeable crossmember is equally needed for a manual tranny. On an assembly line, it'd cost almost nothing to weld on the clutch support tab.
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