Swapping dynaflow trrans on 66 401 engine with 400 trans

J

jgrasmehr

Team Member
I’m restoring a 66 Buick wildcat convertible and the original engine was a 401 nailhead with matching number to the vin. The engine had a blown rod thru the block which I was going to have the hole welded up and the cylinder re-sleeved. But when I had the block x-rayed we found the oil tube damaged and fine hair line cracks in the cylinder walls. So I scrapped the block and purchased another 1966 engine from a wildcat.
The problem is the original engine had a 400 trans and the replacement had a dynaflow trans. I was told to change the flex plate
Which I did but after checking the mounting to the engine the 400 was ½” to short. Is there an adaptor ½” thick available for this or am I doing something wrong? I double checked the mounting of the torque converter and it seems right.
Any help will be appreciated.
 
More than likely, the replacement engine is from a 1963 model year. That was the last year of the TwinTurbine, or Dynaflow transmission The Crank flange is different than later 401 nailhead cranks. You need an adapter flexplate. That should take care of your issue.
 
Psychostang said:
More than likely, the replacement engine is from a 1963 model year. That was the last year of the TwinTurbine, or Dynaflow transmission The Crank flange is different than later 401 nailhead cranks. You need an adapter flexplate. That should take care of your issue.
Click to expand...
jgrasmehr said:
I’m restoring a 66 Buick wildcat convertible and the original engine was a 401 nailhead with matching number to the vin. The engine had a blown rod thru the block which I was going to have the hole welded up and the cylinder re-sleeved. But when I had the block x-rayed we found the oil tube damaged and fine hair line cracks in the cylinder walls. So I scrapped the block and purchased another 1966 engine from a wildcat.
The problem is the original engine had a 400 trans and the replacement had a dynaflow trans. I was told to change the flex plate
Which I did but after checking the mounting to the engine the 400 was ½” to short. Is there an adaptor ½” thick available for this or am I doing something wrong? I double checked the mounting of the torque converter and it seems right.
Any help will be appreciated.
Click to expand...
Contact Russ Martin at Centerville Auto
 
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