You need to investigate the availability/cost of improved hard parts. Things like 6 pinion planets hardened shafts etc.. For example a c4 is pretty weak as built but using aod parts and aftermarket parts can be built to handle 1000 hp. Cost to performance/reliability needs to be considered.
When I started my 528 Ford project I started doing research as to which 3 spd auto would be the strongest cost effective trans for my application. A t400 with a JW bell is hands down the winner. Not just my opinion but opinion of other s far more in the know than I.
I may be trading some parasitic losses but reliability IMO far outweighs any losses I might incur.(especially at the +800 hp level I'll be at)
If I desired overdrive and no loss of reliability I'd look no further than a t400 with a Gear Vendors OD(can be used to make your 3 speed a 6 speed as well). If your racing a JW bell isnt a bad thing for safety and strength or making use of a case core that has a damaged bell or Chevy pattern.
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