Frequently Asked Questions

The gear ratios in the TH-700R4 transmission are very different from the traditional TH-350 or TH-400 transmissions. How will this effect my driveability on the street?

The following chart shows just how different the ratios are. I personally feel that the gear splits in a TH-700R4 are great for street driven cars as long as you don't get too crazy with the rear end gearing! Just go test drive a new Camaro or Corvette and see if you don't agree that the lower first and second gears in this transmission are really fun! These newer cars have the 4L60E transmission, which have the exact same mechanical gear ratios as the earlier Th-700R4's (AKA 4L60).

GEAR

TH-700R4

TH-350

% DIFFERENCE

TH-400

% DIFFERENCE

FIRST  

3.06:1

2.52:1

21% LOWER

2.48:1

23% LOWER

SECOND

1.63:1

1.52:1

6% LOWER

1.48:1

9% LOWER

THIRD

1.00:1

1.00:1

SAME

1.00:1

SAME

FOURTH  

.70:1

N/A

30% HIGHER

N/A

30% HIGHER