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Powerglide Planetary Low
Gear Ratios
The Powerglide planetary is referred to
as a compound gear set with a ring gear. Figure 1 demonstrates the
various elements of this planetary.
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| FIGURE 1 |
When the transmission is in low gear, the
band is
holding the high gear drum stationary which also means that
sun gear S1
(flange gear) is stationary. Input is provided through sun gear S2 (center
gear). This input is transmitted to pinion gear P2/P3 then to pinion gear
P1 (auxiliary gear). Since S1 is being held, P1 is driven around S1 along
with the carrier and output shaft. The ratio at which the
input shaft
turns compared to the output shaft can be determined as follows:
Ratio = 1 + [(P2/P3)(S1/S2)] Gear tooth counts for the ratios
offered by TCI®
are as follows:
|
RATIO
|
S1
|
S2
|
P2
|
P3
|
Identification
Lines2
|
|
1.76
|
26
|
34
|
21
|
21
|
0
|
|
1.821
|
23
|
28
|
18
|
18
|
0
|
|
1.89
|
26
|
32
|
23
|
21
|
1
|
|
1.96
|
26
|
31
|
24
|
21
|
2
|
|
2.03
|
26
|
30
|
25
|
21
|
3
|
|
2.11
|
26
|
29
|
26
|
21
|
4
|
|
Footnote 1 - Stamped type carrier, uses 12
5/8" input shaft.
Footnote 2 - These lines are found on the TCI® long pinion gear teeth.
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