nosfedgta

I have some questions concerning th350's and th400's. i am currently running a th350 in my 9sec trans am. I was thinkning about going to a th400 with a trans brake and a 2.75/157 gear set. My question is how much more poewr is it to turn the 400 than the 350? and if with the brake and steeper gers will I be able to overcome the possible power loss? thanx for any help

02 Silver Z

iTrader: (8)

good questions. To the top for ya. I'm switching from a 4L60E to a TH350, but I'll take all the info I can get!

nosfedgta

let me know if you need a th350 I can get you an awesome price.. just ask cablebandit.....

1badA3Z

iTrader: (58)

it takes 37 hp to turn a th400,just a tad bit less for the th350,u can build a th400 cheaper and will be stouter for the money,put a pro brake in it with a good gear and let her rip

cablebandit

iTrader: (37)

Drew...I lost no et going from the 4l60e to the th400 you got me. Actually the first gear is better...less traction issues. take into account that when i swapped, i went from a 3800 stall DOWN to a 2800 stall
And YES...drew got me an awesome th-400

back4more

if i remmber 7hp from glid to 350 and another 7 from 350 to 400

cbrich

I too have heard this, I have rebuilt 1 th350, and too many to count th400. I can tell you the parts in a th400 are heavier, and like you all know the heavier the part the more power is required to turn it. Since you want to use a transbrake make sure the direct clutch drum is new or in very good conditions, if you need another drum look towards a drum out of a 4L80E because the one-way bearing is a sprag unit, not a roller unit like in most th400. If you do have a sprag unit get the 36 element sprag.

back4more

if you want to spend the money though you can purchase the aluminum forward and high/rev drums from someone, there is a whole lot that distrbute them like tci that will lighten then up i also have seen coan sells a lighted planet i havn't tried them though.