226:
depressed every time the gear shift lever was moved. When the lever was put in Low, the car started in “underdrive” low; when the vehicle reached a minimum speed of 6 mph (9.7 km/h), the driver lifted his foot off the accelerator, the underdrive unit would kick out and the car would be in Low. Similarly, with the lever in High position, the car would start in underdrive high, and at any speed above 13 mph (21 km/h), the driver would lift his foot and the car would “shift” into direct drive.
711:
701:
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most drivers started an M6 car in High and accomplished the shift to direct drive somewhere between 13 and 25 MPH by releasing the accelerator pedal and waiting for the “clunk” that signaled the disengagement of the underdrive. An M6 car would automatically shift from High down to underdrive high when car speed dropped below approximately 11 MPH.
246:
In order for the unit to work without gear clashing, it contained a freewheeling device (in
Underdrive, Low and High), and the Owner's manual cautioned drivers not to use “1st or 3rd” gear when descending hills because there was no engine compression braking in those free-wheeling ranges. Generally,
225:
Attached to the transmission was an “underdrive” with a reduction gear of 1.75/1. The shift lever was column-mounted and had three positions: Low (in the “2nd” position of a conventional 3-speed manual unit), High (in the “3rd” position), and
Reverse (same as the 3-speed). The clutch had to be
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The driver would use the clutch pedal any time when selecting low, high, or reverse gear. Once underway, the accelerator could be eased and the car would engage the overdrive. With the
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coupling, the car could be brought to a halt in gear without releasing the clutch and would creep like an automatic.
440:
735:
387:
287:
465:
540:
140:
86:
377:
676:
565:
505:
470:
201:. Chrysler and DeSoto sold the unit from 1946 to 1953, while Dodge did not introduce it until 1948.
455:
307:
425:
397:
415:
405:
202:
152:
94:
510:
445:
137:
42:
8:
535:
515:
300:
174:
144:
90:
681:
586:
80:
700:
475:
410:
362:
344:
550:
357:
98:
570:
500:
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unit was attached and useful in either gear for a total of four forward speeds.
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485:
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367:
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352:
623:
560:
530:
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17:
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148:
686:
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323:
213:
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257:
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258:"The M6 "four-speed electro-hydraulic semi-automatic" transmission"
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170:
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This configuration had the effect of providing 4 gear ratios:
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334:
151:. Although it had just two forward gears, an electric
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semi-automatic in 1953, but all were replaced by the
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16:For the similarly named comic book and toy, see
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143:produced from 1946 to 1953. It was a special
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13:
431:Continuously variable transmission
14:
752:
741:Automatic transmission tradenames
710:
709:
699:
322:
288:List of Chrysler transmissions
1:
466:Automated manual transmission
250:
217:hydraulic automatic in 1954.
220:
177:called the transmission the
7:
541:Semi-automatic transmission
276:
141:semi-automatic transmission
87:semi-automatic transmission
10:
757:
378:Internal combustion engine
15:
695:
677:Hybrid vehicle drivetrain
664:
579:
566:Transmission control unit
506:Limited-slip differential
471:Electrorheological clutch
396:
343:
330:
120:
110:
105:
79:
74:
66:
48:
38:
33:
28:
456:Dual-clutch transmission
239:Underdrive High, 1.75/1,
426:Constant-velocity joint
233:Underdrive Low, 3.57/1,
736:Chrysler transmissions
406:Automatic transmission
169:name was only used on
511:Locking differential
446:Direct-shift gearbox
138:Chrysler Corporation
43:Chrysler Corporation
536:Preselector gearbox
516:Manual transmission
145:manual transmission
682:Electric generator
587:Wheel hub assembly
723:
722:
476:Epicyclic gearing
345:Automotive engine
205:introduced their
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129:
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580:Wheels and tires
551:Torque converter
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310:
303:
294:
293:
272:
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99:torque converter
75:Body and chassis
49:Also called
26:
25:
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755:
751:
750:
749:
747:
746:
745:
726:
725:
724:
719:
691:
660:
575:
571:Universal joint
501:Hotchkiss drive
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339:
326:
321:
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266:
264:
256:
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134:M6 Presto-Matic
70:1946–1953
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59:
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55:
53:
24:
21:
12:
11:
5:
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672:Electric motor
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486:Friction drive
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481:Fluid coupling
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372:Plug-in hybrid
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149:fluid coupling
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546:Shift-by-wire
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383:Petrol engine
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353:Diesel engine
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179:Tip-Toe Shift
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173:-brand cars.
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54:Tip-Toe Shift
51:
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37:
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23:Motor vehicle
19:
624:Racing slick
561:Transfer box
531:Park-by-wire
526:Parking pawl
441:Differential
416:Direct-drive
398:Transmission
388:Steam engine
333:Part of the
332:
267:February 22,
265:. Retrieved
261:
245:
228:
224:
212:
206:
198:
194:
190:
186:
178:
167:Presto-Matic
166:
164:
157:
133:
131:
115:M4 Vacamatic
52:Presto-Matic
39:Manufacturer
18:Presto Magix
602:Alloy wheel
461:Drive wheel
451:Drive shaft
411:Chain drive
236:Low 2.04/1,
199:Gyro-Torque
195:Fluidtorque
191:Fluid-Matic
160:Fluid Drive
111:Predecessor
60:Fluidtorque
58:Fluid-Matic
730:Categories
687:Alternator
335:Automobile
324:Powertrain
262:Allpar.Com
251:References
242:High, 1/1.
214:PowerFlite
187:Gyro-Matic
125:PowerFlite
106:Chronology
67:Production
62:Gyrotorque
56:Gyro-Matic
556:Transaxle
521:Manumatic
491:Gearshift
363:Fuel cell
283:Vacamatic
221:Operation
153:overdrive
121:Successor
95:overdrive
715:Category
654:Tubeless
639:Run-flat
619:Off-road
436:Coupling
358:Electric
277:See also
208:Hy-Drive
203:Plymouth
181:, while
171:Chrysler
85:2-speed
34:Overview
147:with a
705:Portal
665:Hybrid
629:Radial
607:Hubcap
421:Clutch
368:Hybrid
337:series
175:DeSoto
136:was a
91:manual
649:Spare
592:Wheel
496:Giubo
197:, or
185:used
183:Dodge
93:with
81:Class
644:Snow
634:Rain
614:Tire
269:2006
165:The
132:The
97:and
597:Rim
732::
260:.
193:,
189:,
29:M6
374:)
370:(
316:e
309:t
302:v
271:.
101:)
89:(
20:.
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