GEARBOX

 

How to identificate the automatic transmission type : the simplest way is to recognize the oil pan shape.

1 = Aluminum Powerglide (14 screw), weight: 50kg
2 = TH200 Metric (11 metric screw)
3 = TH250/TH350 (13 screw), weight: 59kg
4 = TH400 (13 screw), weight: 63kg
5 = TH200-4R (16 screw)
6 = TH700-R4, 4L60, 4L60E (16 screw), weight: 80kg
7 = 4L80E (17 screw)

 

Application of the automatic transmission according to the years:

1970 to 1972 Powerglide with 250 et 350ci
  Turbo Hydra-matic 350 with 250 and 350ci
  Turbo Hydra-matic 400 with 400 and 455ci
1973 to 1974 Turbo Hydra-matic 350 with 250 and 350ci
  Turbo Hydra-matic 400 with 400 and 455ci
1975 to 1979 Turbo Hydra-matic 350 with 231, 250, 301, 305, 350, 400 and 403ci
1980 Turbo Hydra-matic 200 with 265 and 301ci
  Turbo Hydra-matic 350 with 231, 301T and 305ci
1981 Turbo Hydra-matic 200 with 265 and 301ci
  Turbo Hydra-matic 350 with 231 and 301ci

 

All transmission mounted on PONTIAC engines.

Code Type Name Gear Multiplication Installation Oil capacity (single drain)
1st 2nd 3rd 4th R
  Manual   3 2,85 1,68 1 - 2.95 250ci 3,5 pints (1,65L)
M15 3-SAG Manual Saginaw 3 3,11 1,84 1 - 3,22 installed on 250 and 260ci 3,5 pints (1,65L)
4-SAG Manual Saginaw 4 2,54 1,80 1,44 1 2,54 installed on 350-400ci 3,5 pints (1,65L)
M13A Manual Muncie 3 3,03 1,75 1 - 3,02 - NC
M13B Manual Muncie 3 2,42 1,58 1 - 2,41 - NC
M20 Manual Muncie 4 2,52 1,88 1,46 1 3,11 - 3 pints (1,41L)
M21 Manual Muncie 4 2,20 1,64 1,28 1 2,27 - 3 pints (1,41L)
T10 Manual Borg-Warner 4 2,43 1,75 1,47 1 2,35 installed on 400 and 455ci 2,5 pints (1,18L)
M38 Automatic TH 350 3 2,52 1,52 1 - 1.92 installed on 350, 400, 455ci 7,5 pints (3,54L)
M40 Automatic TH 400 3 2,48 1,48 1 - NC installed on 250, 350, 400ci 7,5 pints (3,54L)

 

The other tranny :

Ratio

  To see your speed according to the diameter of your wheels, the axle ratio and of the gearbox, enter these values see below. To check your wheel diameter go the bottom of this page. Complete the fields in yellow in the first column, then click "Calculate". The advertised speeds are the theoretical speed and ignore the shift of the converter.

Drive wheels diameter:
 inches
Rear end ratio:
Engine speed:
 rpm
1st gear:
 give

mph    or

kmh
2nd gear:
 give

mph    or

kmh
3rd gear:
 give

mph    or

kmh
4th gear:
 give

mph    or

kmh
5th gear:
 give

mph    or

kmh
6th gear:
 give

mph    or

kmh

       

 

Stock tire size :

R

New size :

R

Enter a speed to know the gap : Km/h

       

tire width :
cm.
new tire width :
cm.
tire high :
cm.
new tire high :
cm.
overall tire diameter :
cm or in.
new overall tire diameter:
cm or in.
at same rpm at Km/h, the new tire diameter is egal to Km/h,
a difference of %.