Allison Transmission AT 1545P Service Manual

Copyright © 1996 General Motors Corp. 3–13
PREVENTIVE MAINTENANCE
PREVENTIVE MAINTENANCE
* For 2nd range start, check for manual shift function only.
** For no 4th range, this shift should not occur.
+ 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 3–8. AT 500 Shift Points — Models After S/N 3210302450
(Without Lockup)
Engine Governed
Speed — rpm
2400 2600 2800 3000 3200 3400 3600 3800 4000
AT 545 Parts Catalog Valve Body
Group
J, R U G, M P F, H, K, L E, N, S V D B A C, Q T
AT 542 Parts Catalog Valve Body
Group
B, Q F, J E N C K D M G H A, P L
Range
Throttle
Position Shift
Transmission Output Speed (rpm) at Start of Shift
1–2* 580-640 580-640 595-655 595-655 595-655 625-680 710-770 595-655 770-830 650-710 770-830 900-960 970-1030 980-1045
Full 2–3 865-1000 970-1090 955-1090 955-1180 1045-1180 1000-1135 1130-1265 955-1090 1220-1355 1045-1180 1310-1445 1400-1535 1490-1625 1600-1700
Drive 3–4** 1455-1595 1455-1595 1595-1735 1595-1735 1735-1875 1665-1810 1880-2020 1595-1735 2020-2160 1740-1880 2165-2305 2305-2445 2450-2590 2555-2710
4–3**
+
510-740 510-740 550-780 670-970 670-990 600-810 600-970 550-780 700-1100 500-795 850-1370 150-600 300-700 200-765
Closed 3–2
+
400-610 435-620 460-650 610-750 510-680 485-645 500-730 460-650 580-820 395-660 610-880 405-720 455-765 445-700
2–1* 40-370 40-370 40-370 220-500 40-370 50-375 140-460 40-370 230-500 40-295 230-500 50-450 50-450 75-480
DR3 4–3** 1820-2120 1820-2120 1980-2280 1980-2280 2100-2370 2100-2370 2240-2690 2150-2475 2290-2770 2290-2770 2400-2890 2600-3050 2760-3240 2760-3240
DR2 Full 3–2 1060-1350 1060-1350 1200-1470 1200-1470 1270-1530 1270-1530 1330-1700 1325-1580 1380-1740 1380-1740 1470-1850 1570-1990 1700-2130 1700-2130
DR1 2–1* 660-900 660-900 735-970 735-970 770-1010 770-1010 910-1080 805-1095 930-1100 930-1100 960-1200 900-1340 1000-1450 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)
50-53
(345-365)
50-53
(345-365)
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)
39-43
(270-296)
44-48
(303-331)
44-48
(303-331)
46-50
(317-345)
46-50
(317-345)
42-46
(290-317)
44-48
(303-331)
44-48
(303-331)
44-48
(303-331)
46-50
(317-345)
36-40
(248-276)
39-43
(269-296)
39-43
(269-296)

Allison Transmission AT 1545P Specifications

General

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