i'm trying to pick what kind of trans should i have. a t-56 trans cuz i have the clutch kit for it, or should i rebuildt my old 700r trans . however my 700r trans is fried cuz there is a cored that connects to the throttle of the intake but i switch the intake and now there is no spot for it. what i was told was that the cored is a passing gear drive??? and if its not connected the trans will break down on u (and it did). well my question is does the manual trans rob less torq/horse or is it the auto trans???

A manual transmission has a lower driveline loss than an automatic because it's simply gears turning on shafts. A clutch provides a 1:1 direct connection and a torque converter will always have slippage. A torque converter can multiply engine torque for a higher output

An automatic transmission is a hydraulic pump. Hydraulic pressure is used to apply clutch packs or bands. The weight of the rotating mass inside an automatic is heavier but not all automatics eat the same amount of power.

A TH400 can use up 44 hp while a TH350 only uses 36 hp plus it's lighter. A simple 2 speed powerglide only uses up 18 hp and is considerably lighter. A heavy TH400 weighs in at 130 pounds. A powerglide is only 97 pounds.

Unless you're racing in a class where every last piece of HP is needed, don't worry about how much power is lost through a transmission. Use whatever tranny you like, manual/auto, and just make sure it's strong enough to handle the power put out by the engine.

Yes you need the cord (its called a TV cable) and it controls the fluid pressure inside the transmission. When you step on the throttle, that cable will increase the fluid and pressure to the important parts of the tranmission so they wil hold together and not slip. Without that pressure, the clutches inside will slip, burn up, and ruin the transmission.