TCI Automotive

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Transmission Gearing Ratios  
GENERAL MOTORS

1st

2nd

3rd

4th
Powerglide (OEM) 1.76 1.00 N/A N/A
Powerglide (OEM) 1.82 1.00 N/A N/A
Powerglide (TCI) 1.65 1.00 N/A N/A
Powerglide (TCI) 1.80 1.00 N/A N/A
Powerglide (TCI) 1.92 1.00 N/A N/A
Powerglide (TCI) 1.98 1.00 N/A N/A
TH350 (OEM) 2.52 1.52 1.00 N/A
TH350 (TCI) 2.75 1.52 1.00 N/A
TH400 (OEM) 2.48 1.48 1.00 N/A
TH400 (TCI) 2.10 1.40 1.00 N/A
TH400 (TCI) 2.75 1.57 1.00 N/A
TH400 (TCI) 2.97 1.57 1.00 N/A
200-4R (OEM) 2.78 1.57 1.00 0.67
TH700R4/4L60E/4L65E (OEM) 3.06 1.63 1.00 0.70
4L80E/4L85E (OEM) 2.48 1.48 1.00 0.75
4L80E/4L85E (TCI)  2.75 1.57 1.00 0.75
4L80E/4L85E (TCI) 2.97 1.57 1.00 0.75
FORD

1st

2nd

3rd

4th
C4 (OEM) 2.46 1.46 1.00 N/A
C6 (OEM) 2.46 1.46 1.00 N/A
C6 (TCI) 2.72 1.54 1.00 N/A
AOD (OEM) 2.40 1.47 1.00 0.67
AODE-W/4R70W (OEM) 2.84 1.55 1.00 0.70
 
CHRYSLER

1st

2nd

3rd

4th
TF-904 (OEM) 2.45 1.45  1.00 N/A
A-500/42RH (OEM) 2.74  1.54  1.00 0.69 
TF-727 (OEM) 2.45  1.45  1.00 N/A
A-518/618/47RH (OEM) 2.45  1.45  1.00 0.69