727 high performance?

[1970challenger]

I am just going over some parts for my car, and looking more closely at the transmission #’s. I found this list of numbers, and it has my transmission as a 73 from a 400 and list as high performance. It’s been rebuilt and up graded, but what did it start as?

 

[challenger6pak]

Road Runner or Charger. Maybe a couple of other models. I don't know if C bodies used HP in 73.

 

[1970challenger]

Road Runner or Charger. Maybe a couple of other models. I don't know if C bodies used HP in 73.

I’m not sure exactly what it’s out of, but wondering what high performance meant? Certain gearing, or a different converter, was the kick down different?

 

[Xcudame]

Originally the transmission probably had four clutches in the front clutch, may have had one or both planetary gears with 4 pinions. Might have had a factory Hi-Stall torque converter. Built a little tougher for a four barrel big block.

 

[413]

Hi performance is the engine. So the engine was a 400 hi performance, not a 400 standard.

read down the far right column, you have many different descriptions.

the standard would have 3 front clutches, low rpm shift governor, different valve body. The kickdoen is the same, its job doesn’t change.

 

[1970challenger]

Mine is the 3681055

 

[challenger6pak]

This link may help.

BB 727 Hi/Po vs Standard trans. difference?