[quote]Originally posted by Dave Y.:
<strong>Any suggestions for a street full steel 55 chevy with sbc355, ford 9" with a 4:56 gear. Got a super t10 now, but considering an automatic change. What would be a better street choice turbo 400 or powerglide? THANKS DY</strong><hr></blockquote>
Powerglide 1st gear = 1.76
Turbo 400 1st gear = 2.48
The Turbo 400 will leave harder than the glide, has two more gears and are almost impossible to kill as long as you keep the fluid level checked.
The down side is that a 400 Turbo takes a few more HP to turn than a PowerGlide. You will lose a few HP at the output shaft comparared to a PG. The better low gear and FUN FACTOR of the 400 makes the few HP loss not a concern in my book.
I have a Turbo 400 in my black 32 Roadster and it is great. If your $$$ will stand it, a 700R should be considered. First gear is 3.06 with 3 more gears. 4th gear is about 30 % overdrive and will cut the 4.56 down to around 3.25 (I don't have my calulater handy). More $$$ but more FUN.
I am building a 40 Ford coupe with a 350 SBC
and I am using a 700R in it.