At 400+hp, What kills A904s?

CudaFactHackJob said

Another racer thinking street cars should run race parts....WHY??? I think I'll call it "904 Derangement Syndrome"...There are a lot of daily drivers on here that don't need to be advised to spend $2k on a 904 tranny when a 727 will work better and more reliable for them at one tenth the cost.

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Maybe so. The common wisdom used to be that the A904 is reasonably durable, weighs 35lbs or so less, and takes notably less power to turn than the 727. If your motor/traction/application was beneath some arbitrary threshold, it made zero sense to buy a 727 and rebuild and have your driveshaft shortened too all just go slower, burn more gas…especially if they already owned a 904.

Looking at the earlier posts in this thread, some guys have verified that at least in their cases, that set of durability limits to be significantly higher than the common wisdom would dictate.

What I’m saying is that I have zero interest in buying another slush pump in my situation but I could understand why someone would stick it out with the 904.