3–12 Copyright © 1996 General Motors Corp.
AT 500, 1500 SERIES AUTOMATIC TRANSMISSIONS
1 Prior to S/N 3210279820.
2 S/N 3210279820 thru 3210302450.
* 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 3–7. AT 500 Shift Points — Models With S/N 3210302450 and Before
(Without Lockup)
Engine Governed Speed — rpm 2400 2400 2600 2800 3000 3200 3400 3600 3800/4000
AT 545 Parts Catalog Valve Body Group J
1
J
2
G F E D B A C
Range
Throttle
Position
Shift
Transmission Output Speed (rpm) at Start of Shift
1–2* 580–640 580–640 595–655 595–655 710–770 770–830 770–830 900–960 900–960
Full 2–3 865–1000 865–1000 955–1090 1045–1180 1130–1265 1220–1355 1310–1445 1400–1535 1490–1625
Drive 3–4** 1455–1595 1455–1595 1595–1735 1735–1875 1880–2020 2020–2160 2165–2305 2305–2445 2450–2590
4–3**
+
305–555 370–660 350–610 490–685 410–680 530–750 675–970 150–600 300–700
Closed 3–2
+
400–560 475–655 465–630 520–665 550–760 590–810 620–875 405–720 455–765
2–1* 20–300 20–360 20–300 20–300 20–300 20–450 20–450 50–450 50–450
DR3 4–3** 1820–2120 1820–2120 1980–2280 2100–2370 2240–2690 2290–2770 2400–2890 2600–3050 2760–3240
DR2 Full 3–2 1060–1350 1060–1350 1200–1470 1270–1530 1330–1700 1380–1740 1470–1850 1570–1990 1700–2130
DR1 2–1* 660–900 660–900 735–970 770–1010 910–1080 930–1100 960–1200 900–1340 1000–1450
Modulator Pressure
psi (kPa)
50–53
(345–365)
42–45
(290–310)
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)
46–50
(317–345)
42–46
(290–317)
44–48
(303–331)
46–50
(317–345)
36–40
(248–276)
39–43
(269–296)
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