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I see many high horsepower cars using a turbo 400 with lots of luck.
What are the internal workings that allow a 400 to be upgraded and work well.

Where are the weak points in the 727 or 400?

looking at 850-1000hp street strip car.

seams like the new hot setup is powerglide with gear vendors overdrive,many fox body and newer mustangs run then with out fail, with sick 8-9 second 1/4 miles passes on real street cars with turbos or chargers 800-1200 hp



Interesting option....
http://www.gearvendors.com/racing.html

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DRAG RACING Powerglide

The GEAR VENDORS in combination with the Powerglide is an affordable, reliable, and very efficient package. This is a superior alternative for most cars thinking of going to a Th400. The GEAR VENDORS .78 to 1 ratio allows you to go to a numerically higher rear gear to improve your 60ft. times and get it all back with the overdrive. The reciprocal of our ratio is 1.28 so a car that currently runs a 4.56 rear could go to a 5.84 without loss of top end. You will have these improvements with reduced cost, greater reliability, and lower parasitic losses when compared to 3-speeds. Using a lower rear end ratio also lets you keep a close ratio spread on your glide for more power at the 1-2 shift. Many cars with 1200hp or less will also find benefit in using 1st-over which will net a really nice 4spd spread of 1.76, 1.33, 1.00, 0.78. or 1.82, 1.41, 1.00, .78

The overdrive is switched on with 12-volts and so is easily adapted to steering wheel buttons or automated through our AutoShift sequencer or rpm switches. The product is ideally suited in stock form for cars with 1200hp or less and in this case is virtually indestructible, literally running for seasons of use without maintenance other than fluid. Cars with more than 1200+ horsepower can be accommodated but you should call the factory so hydraulic issues dealing with clutch ramp timing can be properly adjusted for your application weight and hp.