Sure Grip

[Terry Hauck]

What is the original gear ratio for a 383 4 speed 69 Roadrunner vs the same year automatic?

 

[quikbird]

My guess is 3.23

 

[roadrunnerbob]

mine is factory auto and it came with 355 sure grip

 

[Russ69Runner]

The 8 3/4 rear end in this car with and automatic transplant had 2/72 gearing. Open diff.

 

[droptop]

The 8 3/4 rear end in this car with and automatic transplant had 2/72 gearing. Open diff.

You also have a 472 case.....not original unit.

 

[Russ69Runner]

Yep.