Torque converter issue?

[Sonny]

I have a 70 b body 440 with a A727 and a 2000 stall torque converter. When I nail it from a stop, all is good. Quick and great shifting thru the gears. If I’m doing 45mph, and I drop it into 2nd gear and nail it, the car falls on its face for a second or two. If I ease into the throttle it’s better. Could this be a TC issue? This has happened with different carbs, fuel injection, dizzys, timing etc. should I go back to a stock TC? Not a race car.
Sonny

 

[snakeoil24]

Not enough information

 

[davek]

with the stock tc did you have the same problem at 45?

 

[69L48Z27]

Not sure a converter could case a hesitation. I would think timing and fuel delivery would be something to look harder at. Both requirements are different, from a standstill vs a kick down from cruise to WOT.

 

[BeepBeepRR]

What about the pump?

 

[Sonny]

with the stock tc did you have the same problem at 45?

Never had a stock one. Swapped small block with big block and trans rebuild guy selected this one.

 

[davek]

So you are ironing out the bugs right now. you tried 2 different carbs and same result?

 

[Sonny]

So you are ironing out the bugs right now. you tried 2 different carbs and same result?

4 and a new fuel injection unit.

 

[Sonny]

Someone mentioned Transmission pump. Is it possible I don’t have the kick down linkage set properly to the transmission pump? I’m using the Lokar cable type.

 

[davek]

vac leak?

 

[davek]

I personally dont think it the pump. check the linkage setup

 

[snakeoil24]

Someone mentioned Transmission pump. Is it possible I don’t have the kick down linkage set properly to the transmission pump? I’m using the Lokar cable type.

Yes easy way to tell is engine over reving

 

[Sonny]

Yes easy way to tell is engine over reving

No it does the opposite. Boggs and nearly cuts off.

 

[snakeoil24]

Fuel

 

[Sonny]

Fuel

You were right snakeoil! I used my fancy EFI data log and noticed that bog showed an afr of around 9 at 3000 rpm. Changed wot afr from 12.5 to 13.2 and bog is gone!!! Thanks for the tips.