550+ and 500 or less is 2 different transmissions. It goes back to the old adage, "2 ton of fertilizer in a 1 ton truck". You might be able to build a transmission for that power level but if it's on the ragged edge you may have problems. Don't come complaining when it fails. Like a member on another site here. Wanted a new Ram pick up. 4 door 4 wheel drive and wanted to tow a 16' boat but wanted to buy the V6. Nope, use your head and get the Hemi.
