The TH400 is probably gonna eat up an extra 20-30HP because of it's heavier internals...myself i'd stick with the TH350
1984 Regal 327 said:i have a 400 hp 327 in my 84 regal with a turbo 400 transmission , had to get a custom driveshaft but it was worth it
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.