At 400+hp, What kills A904s?

'68cuda416 said
Well if that's the argument then I guess I will just stay cool with my 60's and very early 70's genuine muscle cars and have something that a generation of men built versus government built, way overpriced computer controlled junk that millennials adore......I mean I could personally care less about beating everything on the planet.....motorcycles can easily be faster, diesel trucks can easily be faster, some EV's may be faster..BUT they aren't cool and represent something I am not nor do I want to be.

Yep. I agree with pretty much all of that. In my personal opinion, the chance to shift our own gears is just one step farther. For some people that part doesn't matter as much or maybe they prefer their autos. That's fine with me. I'm sure not trying to tell anyone they are wrong for what they like. I was just sharing my own thoughts.

I don't know what the heck you mean by electrics "government built." As much as I dislike Elon Musk, the guy is an anti-government oligarch.

CudaFactHackJob said
"and takes notably less power to turn than the 727"...wtf does "notably" even mean? I've seen "60 horsepower" listed as the amount between a C4 and C6...Idiots take out a low gear 999 and stick in a New Yorker 727 (along with its low stall converter) in a Duster (with no kickdown) and then claim that all 727s are pigs. I've seen the same anecdotal argument against the th400 compared to the th350. (Some say I'm 'relentlessly persistent', but I take issue with such statements...)

What does "notably" mean? A measurable, repeatable result that makes a big enough difference that we would care about it. That's what I meant at least.

As I said, this was (and still is as far as I know), the common wisdom. I don't have access/time/money to test them myself.

After a quick search, I am surprised to see a number of sources quoting an old Car Craft article (that I would like to find..)citing actual measurements comparing various auto transmissions. I imagine that there are significant variables that would impact these results and I don't know how Car Craft did (or did not) try to control for those variables.

These numbers are from the article in Car Craft Magazine:

Powerglide_____18 hp
TH-350________36 hp
TH-400________44 hp
Ford_C-6______55-60 hp
Ford_C-4______28 hp
Ford_FMX______25 hp
Chrysler_A904__25 hp
Chrysler_727___45 hp