Copyright © 1996 General Motors Corp. 1–7
GENERAL INFORMATION
Table 1–1. Specifications and Data
(cont’d)
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Right side (viewed from rear)
Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Same as engine
Rating (continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 lb ft (270 N·m)
(intermittent). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 lb ft (270 N·m)
Torque Converter:
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single-stage, 3-element, multiphase
Number of stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Number of elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Stall torque ratio:
AT 540 AT 542 AT 543 AT 545 AT 1542 AT 1545
TC275;1.96:1 x x x x x
TC290;1.72:1 x x x x x
TC350;3.09:1 x
TC370;2.51:1 x
TC375;2.13:1 x
TC380;1.86:1 x
Lockup Clutch No No No No Yes
(3rd and 4th)
Yes
(3rd and 4th)
Typical Shift Sequence (wide open throttle):
AT 500 Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto 1–4 (1C-2C-3C-4C)
AT 1500 Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto 1–4 (1C-2C-3C-3L-4L)
Shift modulation:
(Gasoline). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vacuum
(Diesel). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical/Electronic
Neutral start and reverse signal switches . . . . . . . . . . . . . . . . . . . . . . . . .
Supplied by OEM
Speedometer drive:
Type and size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
⁄
16
-20 UNEF thread for SAE
regular duty — thread type
Drive gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 teeth
Driven gear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supplied by customer
Gearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Constant mesh, spur type, planetary
TRANSMISSION RATIOS (Mechanical**)
Range Clutch(es) Engaged Ratio
Park (AT 542N, 545N, 1545N) First 0
Neutral First 0
First Forward and first 3.45:1
Second Forward and second 2.25:1
Third Forward and third 1.41:1
Fourth Forward and fourth 1.00:1
Reverse Fourth and first 5.02:1
** Overall torque multiplication ratio of transmission (output stalled) is the product of the converter torque multiplication ratio (see torque converter) and
the mechanical (gear) ratio.
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