SStraycat96 Posted March 25, 2007 Share Posted March 25, 2007 Will a Chevrolet 400 tubohydromatic bolt up to an Olds 455 inplace of the 400 in it. I have a chance to get one at a very good price but want to make sure before buying it. Link to comment Share on other sites More sharing options...
imported_Badger Guy Posted March 25, 2007 Share Posted March 25, 2007 Olds, Buick, or Pontiac are the only ones that will bolt up. Link to comment Share on other sites More sharing options...
joe_padavano Posted March 25, 2007 Share Posted March 25, 2007 Actually, Caddy also uses the same bolt pattern. Chevy is the only GM family that uses a different bellhousing bolt pattern. The bottom four bolts and the indexing pins are the same, but the top bolts are different. You can buy a Chevy-to-BOP adapter plate from places like Jegs or Summit. These cost around $70. Keep in mind that TH400s came with several different tailhousing lengths. That needs to match the body style as well to avoid driveshaft problems. You can't just change the tailhousing, since the output shaft lenght is different to match and changing that requires total disassembly of the trans. Link to comment Share on other sites More sharing options...
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