video of their TH400 while daily?
Dont have a video, but T56 forth is 1:1 ratio
Th400 in 3rd is 1:1 ratio
so yes, driving in 4th is like driving in 3rd in a th400.
I drive my truck all the time on the highway with a th400 and 3.08 gears. at 65 mph my eninge rpms are like 2700. With a 25" tire
If I had a way to take video I would get you some when the weather warms up. Below zero here in central Illinois today. Otherwise a th400 isn't all that bad. I averaged about 11 mpg on the highway on a 28" mt et street radial and 3.73 rear gear in my 12 bolt on a head/ cam car.
When comparing 4th in a T56 to 3rd in the TH400 you have to remember the TH400 is non-lockup, so it's going to actually be a little higher in RPM than your 4th gear is due to the nature of a non-lockup transmission. That being said I'm going to daily drive mine on 26" tall tires and 3.46 gears. I expect 11 or 12 mpg.
i would give u a video but weve got snow. with 3.42 gears and a th400 im doing 3k rpms @ 60 mph.. much different then a t56.. but hopefully will be worth it in the end 
edit: i dont DD my car
edit: i dont DD my car
Last edited by sidewayz28; Dec 24, 2008 at 02:44 AM.
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whats your rear differentials ratio? and where does your 1st shift at what speed? and where does your second shift?
Damn I was thinking about this transmission, but not anymore, my 4.11 rear end will make this an undrivable car...
Do you know whats the top speed on it?
Damn I was thinking about this transmission, but not anymore, my 4.11 rear end will make this an undrivable car...
Do you know whats the top speed on it?
if i had to guess he has a manual valve body. and your top speed wont be anything like a 6 speed.
I have 3.73 gears and I would not reccomend if you daily drive the car about top speed I do not know since my speedo is way off but I hardly ever drive it on the street I will get fix when I go to my tuner in memphis