Does anyone know any info on how to do this?Any companys that make conversion parts?

 

Why do you want a 400? 400's will cut your fuel economy, were more made for durability and have a larger spinning mass (which also affects mileage). Racers use them sometimes, but for everyday driving, stay with the 700r-4, especially since it has overdrive and a higher final drive ratio which equates to better fuel economy. [8D]

 

I want it for durability.Street strip.
John