As I move closer to building my 424 SBO, the motor itself doesn't bother me as much as the trans and rear. I know the motor will be 400+ HP and 500 ft/lbs. My long term goal to lay down the hammer on all but the highest power modern muscle cars is a beefed up 2004R with billet parts and 3.90 gears and posi in the Type O in my 70S. Gear multiplication is a huge reason modern cars are so fast, I need at least 4 gears and OD to compete. Currently it has a 2.78 open ratio along with 28" tall tires means a liveable 2250 at 60 mph. I have a good shifting stock 2004R with a deep pan and a 2300 stall about the minimum I would run, should stall a bit higher with more power. Will a CK billet servo and shift kit help this trans live more than a day? I not sure if the Transgo shift helped much but on the one, the converter imploded and the other I set the band too tight with the Billet servo. The last 2004R was ran low due to a crappy, leaky Hughes pan and a rolled dipstick seal. Still have that trans for available parts and can get more cores. I can also get a used BOP TH350 from the same wrecker. How much power would a good used TH350 take with a Transgo shift kit? I don't want to go the TH400 route, too much modification. I am not a fan of TH350 stock, saw two fail behind 165 HP of mid 70's Olds 350 power, one had 158,000 miles. I also saw one last about a day behind a stock mid 70's 454 truck motor dropped in a Camaro. He through a used one in with shift kit, lived for a while at least. Is the TH350 with a Transgo kit the way to go short term? I would also throw in a Jegs 2300 to 2700 stall converter. I have a governor for both trans that are better than the stock 4000 rpm shifts, well 3000 on the current 2004R. I am not a TH350 fan, so other than inconvenience, I don't care if it breaks. Does it have a better chance of living than the 2004R? Thoughts?