Allison Transmission AT 1545P Service Manual

3–14 Copyright © 1996 General Motors Corp.
AT 500, 1500 SERIES AUTOMATIC TRANSMISSIONS
* For 2nd range start, check for manual shift function only.
+ 4–2 downshift is acceptable.
Full throttle position is 0 inch (0 mm) Hg vacuum.
Closed throttle position is 19–21 inch (483–533 mm) Hg vacuum.
NOTICE: To update units prior to S/N 3210302450 to later configuration, refer to SIL 14-TR-85.
Table 3–9. AT 1500 Shift Points
(With Lockup)
Engine Governed Speed — rpm 2400 2600 2800 3000 4000
AT 1500 Parts Catalog Valve Body Group
Y, AE W, X, AD,
AF
AB
AT 1542 AT 1545
AK
AG
Range
Throttle
Position
Shift Transmission Output Speed (rpm) at Start of Shift
1–2* 580–640 595–655 595–655 595–655 710–770 980–1045
Full 2–3 865–1000 955–1090 1045–1180 955–1090 1130–1265 1600–1700
Drive 3–4 1560–1705 1700–1845 1845–1985 1700–1845 1985–2130 2680–2840
4–3
+
525–755 625–830 710–1135 625–830 660–990 310–885
Closed 3–2
+
400–610 460–650 510–680 460–650 500–730 445–700
2–1* 40–370 40–370 40–370 40–370 140–460 75–460
DR3 4–3 1820–2120 1980–2280 2100–2370 2150–2475 2240–2690 2760–3240
DR2 Full 3–2 1060–1350 1200–1470 1270–1530 1325–1580 1330–1700 1700–2130
DR1 2–1* 660–900 735–970 770–1010 805–1095 910–1080 1000–1450
Modulator Pressure
psi (kPa)
50–53
(345–365)
50–53
(345–365)
50–53
(345–365)
50–53
(345–365)
50–53
(345–365)
50–53
(345–365)
Hold Regulator Pressure
psi (kPa)
39–43
(269–296)
44–48
(303–331)
46–50
(317–345)
42–46
(290–317)
42–46
(290–317)
39–43
(269–296)

Allison Transmission AT 1545P Specifications

General

Brand	Allison Transmission
Model	AT 1545P
Category	Microphone system
Language	English