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differentials at all times, as in the Previa All-Trac models. Neither the Previa nor the Celica have a lockable transfer case, but the viscous coupling can be temporarily disabled for testing purposes via a selector switch on the transfer case assembly. The vehicle should not be driven with the viscous coupling disabled as transfer case or transmission damage will occur. Some
Celicas were equipped with a
71:, front differential and center differential can be separated from the transfer case sub assembly. The transmission output shaft feeds power into the front/center differential assembly (the center differential is contained within the front differential). The center differential applied equal torque to both the front and rear wheels.
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Toyota's GT-Four / All-Trac system was originally released on the ST165 chassis Celica that was only available in Japan. The system used a locking transfer case that was the same as the electric/vacuum system that is found on U.S. All-Trac Camrys. For the 1988 model year when the U.S. All-trac system
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and when activated, the transfer case locks, resulting in the front and rear differential input shafts being driven at the same speed. The result of this is that if the vehicle is in a situation where traction is uneven or poor (i.e. muddy or snowy), the car can move with traction in either the front
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For the Celica, the original ST165 GT-Four of
October 1986 had "Center Diff. Lock" with switch located near the hand brake, and starting from the facelift model of October 1987 came with transfer case contains a viscous coupling unit that provides 50/50 power distribution to the front and rear
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badged models and the nameplate was used from 1988 to 2000. It was considered a revolutionary advance for four wheel drive automobiles into the mainstream consumer market and its electronic/vacuum controlled locking center
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torque-biasing rear differential which apportions torque to the left and right wheels depending on available traction, up to a mechanically determined maximum torque bias ratio or TBR.
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The All-Trac system had five main parts: the front differential, rear differential, center differential, the transmission, and the
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63:, front differential, center differential and transfer case are all one large assembly and are connected to the
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arrival, the Celica GT-Four / All-Trac had changed the transfer case to a viscous coupling unit.
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1988–1989 for ST165 chassis, 1990-1993 for ST185 chassis, all with 4 cylinder turbo 1998 cc
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1990 Toyota Celica New Car
Features Book by Toyota Motor Sales USA, printed in 1989.
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name in 1986, but was not released in the U.S. until 1988 under the All-Trac name.
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was rare in a passenger car. The system originated in Japan under the
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Proprietary full-time four-wheel drive system by Toyota
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128:, DX, LE, LE supercharged trim, 4 cylinder 2438 cc
313:- a torque vectoring four-wheel drive system from
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304:- a four-wheel torque vectoring system from
74:For all manual transmission models except
108:, DX and LE trim, 4 cylinder 1998 cc
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118:, std trim, SR5, 4 cylinder 1587 cc
351:Four-wheel-drive system tradenames
295:- a four-wheel drive system from
23:Toyota Celica All-Trac Turbo ST185
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286:- a four-wheel drive system from
277:- a four-wheel drive system from
271:branded four wheel drive system
261:branded four wheel drive system
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332:1993 Toyota Celica Brochure.
329:1990 Toyota Celica Brochure.
34:system used on a variety of
30:was a proprietary full-time
232:Predecessors and successors
65:transversely mounted engine
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154:, with 4 cylinder 1998 cc
78:, and the 1988 and newer
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192:Toyota Mark II (X100)
136:Toyota Celica GT-Four
51:Technical information
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146:Toyota Starlet (P80)
126:Toyota Previa (XR10)
116:Toyota Corolla (E90)
174:Toyota Chaser (X90)
168:Toyota Cresta (X90)
67:. The transmission
152:Toyota RAV4 (XA10)
106:Toyota Camry (V20)
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315:Mitsubishi Motors
84:Center Diff. Lock
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87:or rear wheels.
32:four-wheel drive
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210:Toyota Progrès
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186:Toyota Verossa
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162:Toyota Caldina
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99:Model series
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69:bell housing
61:transmission
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41:differential
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340:Categories
321:References
269:Volkswagen
214:2001-2021
208:2001-2007
202:2001-2007
196:2004-2019
190:1996-2007
184:2001-2004
178:1991-2020
172:1992-2001
166:1992-2001
160:1992–2007
150:1995–2000
144:1989-1995
134:1988–1993
124:1990–1999
114:1988–1992
104:1988–1991
244:See also
28:All-Trac
265:4motion
255:quattro
45:GT-Four
346:Toyota
302:SH-AWD
293:xDrive
288:Nissan
284:ATTESA
275:4Matic
250:E-four
140:3S-GTE
93:Torsen
80:Celica
76:Previa
59:. The
36:Toyota
311:S-AWC
306:Honda
156:3S-FE
120:4A-FE
110:3S-FE
259:Audi
297:BMW
130:2TZ
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