HI How much e/t lost if any in a change from a th350 to a th400 ?
I got this th400 with the 36 element drum the 2 sprag one new , transbrake , deep oil pan just need the clutch kit to put it together .
I am looking to upgrade my trans. but got this good deal ,I pay $400.00 for the th400 with all the parts.

My car din't slow dow one bit with a swap from a th350 to a th400.

It could have been due to a poor or defective th350, or the loss simply isn't as much as some try to claim. If you would see any loss, it really couldn't be any more than a tenth.

For my car runnin mid/high 10's, each tenth is approx 20 hp. It would have to be a terrible th400 to eat more than 25 hp over a th350.

Thanks ,seems that the th400 it is the way to go .
10secBu,do you got any pictures of your car? with your performance it got to be a nice ride down the 1/4 mile graemlins/hurray.gif

I added a little more stall 3000 to 3500 with the trans swap, lost nothing,gained nothing.

My son's '70 Chevelle went 10.26 @ 130 MPH with a "Turbo 400" and 10.15 @ 131 with a "Turbo 350" the following week in similar air. 481 cu. in., 4.10 Ford rear end, Dart 335 CNC Heads, small Crane roller cam. I'd say about 15 horsepower difference.

I would be safe with the stock sprag at how much hp/tq (in E/Ts please )it can handle ?

Keep in mind that the faster you go, the more power it will draw. A tenth loss from a 10 sec. car will not be a tenth on a 14 sec car. I wouldn't worry about the loss.

did you break your th350? why do you want to change what works? why don't you put the money into traction devices or something? just wondering graemlins/thumbsup.gif