Deck 28: Allison 1000 and 2000 Series Transmissions

Question 1

What does the transmission use to attain the different gear ratios?

A) Dog clutches
B) One-way rollers
C) Multiple disc clutches
D) Brake bands

Answer 1

C

Question 2

Choose the correct statement with respect to solenoids.

A) The valve body contains three trim solenoids.
B) The shift solenoids are normally open when they are deenergized.
C) The shift solenoids are pulse width modulated.
D) The shift solenoids do not directly act on the transmission clutches. Rather they move valves in the valve body.

Answer 2

D

Question 3

The resistance value of the torque converter clutch solenoid is:

A) 8-15 ohms.
B) 5.5-8.0 ohms.
C) 10-20 ohms.
D) 20-30 ohms.

Answer 3

A

Question 4

All of the following statements with respect to the speed sensors are true except:

A) They are variable reluctor sensors that produce an AC sine wave that can be interpreted by the transmission control module.
B) Most gas engines use the engine speed sensor.
C) The turbine speed sensor senses speed from the PTO gear mounted on the C1/C2 clutch housing.
D) The NSBU switch will prevent the truck from starting in any gear except park or neutral.

Question 5

The internal filter needs to be changed:

A) whenever the external filter is changed.
B) during every service.
C) during every alternate transmission service.
D) during the first transmission service.

Question 6

Tech A states that Allison transmissions use two trim solenoids to control pressure. Tech B states that the transmission uses two pressure control solenoids. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 7

You test the line pressure on an Allison transmission and find that the pressure is only 90 psi (621 kPa) in all gears. Tech A states that solenoid A could be in fail safe. Tech B states that solenoid B may not be energized. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 8

Tech A states that the shift solenoids in an Allison transmission are pulse width modulated to control the shift feel. Tech B states that the trim solenoids are proportional current solenoids. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 9

Tech A states that the two trim solenoids on an Allison transmission are both normally closed. Tech B states that one trim solenoid is normally open, while the other is normally closed. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 10

A vehicle with an Allison transmission comes in to the shop with a code for a crankshaft speed sensor. Tech A states that the torque converter may be damaged. Tech B states that the code may indicate the transmission is slipping. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 11

Two technicians are discussing transmission service on an Allison transmission. Tech A states that the internal filter should be changed every fluid service. Tech B states that the external filter is only changed during the first service. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 12

A vehicle with an Allison transmission comes in to the shop with poor acceleration and no reverse. You test drive the vehicle and determine that there is no 1st or reverse gear. Tech A states that the problem could be a bad C3 clutch. Tech B states that the problem could be a bad C5 clutch.
Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 13

You are testing the solenoids on an Allison transmission and find the resistance of the trim solenoids to be 12.3 ohms. Tech A states that the solenoids need to be replaced. Tech B states that the resistance should be higher than 12.3 ohms. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 14

An Allison transmission comes in to the shop with ratio error codes for all gears. Tech A states that the transmission output shaft speed sensor could be faulty. Tech B states that the output shaft speed sensor can be checked with a DC voltmeter. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 15

A vehicle with an Allison transmission comes in with slipping 4th, 5th and 6th gears. Tech A states that the problem could be a burned C1 clutch. Tech B states that the problem could be a bad shift solenoid. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 16

In order to remove the manual linkage from the transmission, the roll pin will need to be removed using a:

A) screwdriver.
B) pair of vise grips.
C) wrench.
D) sharp pick.

Question 17

For how long should all frictions be soaked in the specified automatic transmission fluid before being installed into the transmission?

A) At least 15 minutes
B) At least 30 minutes
C) At least 1 hour
D) At least 1 day

Question 18

All of the following can be used in cleaning a valve except:

A) a bore brush.
B) a drill.
C) a solvent tank.
D) a scrubber.

Question 19

When installing the bell housing onto the pump, the bolts should be torqued to:

A) 37 ft-lb (50 N·m).
B) 20 ft-lb (27 N·m).
C) 32 ft-lb (43 N·m).
D) 41 ft-lb (56 N·m).

Question 20

When installing the main shaft, if the shoulder of the main shaft sticks up more than 0.100 inches from the planet carrier shaft:

A) rotate the main shaft to attempt to get it to seat back down.
B) try to install without the main shaft support tool.
C) remove the bolts and reinstall them to the correct torque specifications.
D) recheck clutch pack clearance.

Question 21

The disassembly of an Allison 1000/2000 transmission is being discussed. Technician A says that the internal filter should be removed after the valve body is removed. Technician B says that a special tool is required to remove the electrical harness from the transmission case. Who is correct?

A) Technician A
B) Technician B
C) Both Technicians A and B
D) Neither Technicians A nor B

Question 22

What is the special tool required to remove the C4 snap ring from an Allison 1000/2000 transmission?

A) GM Special tool
B) Snap ring tool
C) Spring compressor
D) Pick type tool

Question 23

How many return springs are located behind the C4 clutch apply plate of an Allison 1000/2000 transmission?

A) 2
B) 3
C) 4
D) 5

Question 24

Allison transmission reassembly is being discussed. Technician A says that the new clutch discs should be soaked for at least 15 minutes. Technician B says that new clutch discs should be soaked for at least 60 minutes. Who is correct?

A) Technician A
B) Technician B
C) Both Technicians A and B
D) Neither Technician A nor B

Question 25

An Allison C3 clutch pack clearance is being measured. What is the acceptable clearance for a C3 clutch pack?

A) 0.030 mm - 0.040 mm
B) 0.76" - 1.01"
C) 0.030" - 0.040"
D) 0.300" - 0.400"

Question 26

What special tool(s) is required to remove the C1 piston assembly from the assembly of an Allison 1000/2000 transmission?

A) Clutch spring compressor
B) Seal remover and installer
C) Two pick type tools in the oil feed holes
D) External snap ring pliers

Question 27

When rebuilding the C1 and C2 clutch housing on an Allison 1000/2000 transmission, how many clutch pistons are included in the assembly?

A) 1
B) 2
C) 3
D) 4

Question 28

An Allison 1000/2000 transmission C1 clutch pack assembly clearance is being measured. Technician A says that the clearance should be between 0.105" and 0.125". Technician B says that if the clearance is not within specifications, the backing plate should be changed. Who is correct?

A) Technician A
B) Technician B
C) Both Technicians A and B
D) Neither Technicians A nor B

Question 29

How many sealing rings need to be replaced on the back of an Allison transmission pump?

A) 2
B) 3
C) 4
D) 6

Question 30

An Allison 1000/2000 series transmission pump is being rebuilt. Technician A says that all three stator support shafts should be replaced. Technician B says that the front pump bushing can be reused if it appears OK. Who is correct?

A) Technician A
B) Technician B
C) Both Technicians A and B
D) Neither Technician A nor B

Question 31

The Allison 1000, 2000, and 2400 series transmissions can be identified by the stamped metal tag on the body of the transmission.

Question 32

Which of the following statements is NOT true regarding the Allison transmissions?

A) The transmission uses no brake bands, one-way rollers, or sprags.
B) The transmission utilizes five clutches for all forward speeds as well as reverse.
C) The transmission requires different rebuild kits.
D) The 1000, 2000, and 2400 versions of the transmission are all relatively similar.

Question 33

Which of the following Allison transmission models does NOT come equipped with a parking pawl?

A) Allison 1000
B) Allison 2000
C) Allison 2400
D) None of the above

Question 34

Technician A says that the Allison 1000 transmission contains four shift solenoids. Technician B says that the Allison 1000 contains two trim solenoids. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 35

The trim solenoids were renamed pressure control solenoids after a few years.

Question 36

The Allison transmission utilizes three speed sensors.

Question 37

Technician A says that the diesel engine equipped Allison 1000 transmission uses an engine speed sensor. Technician B says the engine speed sensor is not used on gasoline powered engines. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 38

The Alison 1000 series transmissions has two filters. Technician A says that the outside filter should be replaced at each service. Technician B says that the internal transmission filter only needs to be replaced at the first service. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 39

All Allison 1000 series transmission gear ratios require the application of two clutches.

Question 40

Technician A says that during a shift, one of the two clutches from the previous gear will remain engaged. Technician B says that when shifting, one of the new gear clutches will engage. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 41

How many overdrive gear ratio(s) does the 5-speed version of an Allison transmission have?

A) One
B) Two
C) Three
D) Four

Question 42

The 6-speed version of an Allison transmission has ________

A) four overdrive ratios
B) three overdrive ratios
C) a single overdrive ratio
D) dual overdrive ratios

Question 43

Tech A states that the Allison transmission can be identified by a standard stamped metal tag on the body of the transmission. Tech B states that all Allison transmissions are five-speed transmissions. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 44

The 1000 series Allison transmission is rated for ________ gross vehicle weight.

A) 30,000 pounds
B) 19,850 pounds
C) 26,000 pounds
D) 11,793 pounds

Question 45

Which of the following Allison transmission is rated for 30,000 pounds gross vehicle weight?

A) 1000 series
B) 2000 series
C) 2400 series
D) 3000 series

Question 46

The 2400 series Allison transmission is rated for ________ gross vehicle weight.

A) 30,000 pounds
B) 19,850 pounds
C) 26,000 pounds
D) 11,793 pounds

Question 47

Tech A states that each version of an Allison transmission has a separate rebuild kit. Tech B states that only one rebuild kit is sold for all the versions of an Allison transmission. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 48

The Allison transmission is completely ________ controlled.

A) mechanically
B) pneumatically
C) hydraulically
D) electronically

Question 49

Tech A states that the solenoids of an Allison transmission use pulse width modulation. Tech B states that the solenoids do not use pulse width modulation. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 50

The torque converter clutch solenoid of an Allison transmission operates on a frequency of ________

A) 100 Hertz
B) 350 Hertz
C) 250 Hertz
D) 400 Hertz

Question 51

What is the resistance value of trim A solenoid?

A) 8.5-15 ohms
B) 20-30 ohms
C) 5.5-8.0 ohms
D) 40-50 ohms

Question 52

Identify the solenoid that has a resistance value of 20-30 ohms.

A) Torque converter clutch
B) Trim B
C) Shift Solenoid E
D) Trim A

Question 53

Tech A states that hydraulic fluid cannot move through the solenoids of an Allison transmission very quickly. Tech B states that the trim solenoids operate at a frequency of 1000 Hz and open and close 1000 times per second. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 54

The output pressure of trim solenoid A of an Allison transmission is at 0 psi. Tech A states that the solenoid could be in failsafe mode. Tech B states that solenoid may have full current. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 55

When installing the main shaft, if the shoulder of the main shaft sticks up more than 0.100 inches from the planet carrier shaft:

A) rotate the main shaft to attempt to get it to seat back down.
B) try to install without the main shaft support tool.
C) remove the bolts and reinstall them to the correct torque specifications.
D) recheck clutch pack clearance.

Question 56

In order to remove the manual linkage from the transmission, the roll pin will need to be removed using a:

A) screwdriver.
B) pair of vise grips.
C) wrench.
D) sharp pick.

Question 57

For how long should all frictions be soaked in the specified automatic transmission fluid before being installed into the transmission?

A) At least 15 minutes
B) At least 30 minutes
C) At least 1 hour
D) At least 1 day

Question 58

All of the following can be used in cleaning a valve except:

A) a bore brush.
B) a drill.
C) a solvent tank.
D) a scrubber.

Question 59

When installing the bell housing onto the pump, the bolts should be torqued to:

A) 37 ft-lb (50 N·m).
B) 20 ft-lb (27 N·m).
C) 32 ft-lb (43 N·m).
D) 41 ft-lb (56 N·m).

Question 60

A vehicle with an Allison transmission comes in to the shop with a code for a crankshaft speed sensor. Tech A states that the torque converter may be damaged. Tech B states that the code may indicate the transmission is slipping. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 61

Two technicians are discussing transmission service on an Allison transmission. Tech A states that the internal filter should be changed every fluid service. Tech B states that the external filter is only changed during the first service. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 62

A vehicle with an Allison transmission comes in to the shop with poor acceleration and no reverse. You test drive the vehicle and determine that there is no 1st or reverse gear. Tech A states that the problem could be a bad C3 clutch. Tech B states that the problem could be a bad C5 clutch.
Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 63

You are testing the solenoids on an Allison transmission and find the resistance of the trim solenoids to be 12.3 ohms. Tech A states that the solenoids need to be replaced. Tech B states that the resistance should be higher than 12.3 ohms. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 64

An Allison transmission comes in to the shop with ratio error codes for all gears. Tech A states that the transmission output shaft speed sensor could be faulty. Tech B states that the output shaft speed sensor can be checked with a DC voltmeter. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 65

A vehicle with an Allison transmission comes in with slipping 4th, 5th and 6th gears. Tech A states that the problem could be a burned C1 clutch. Tech B states that the problem could be a bad shift solenoid. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 66

What does the transmission use to attain the different gear ratios?

A) Dog clutches
B) One-way rollers
C) Multiple disc clutches
D) Brake bands

Question 67

Choose the correct statement with respect to solenoids.

A) The valve body contains three trim solenoids.
B) The shift solenoids are normally open when they are deenergized.
C) The shift solenoids are pulse width modulated.
D) The shift solenoids do not directly act on the transmission clutches. Rather they move valves in the valve body.

Question 68

The resistance value of the torque converter clutch solenoid is:

A) 8-15 ohms.
B) 5.5-8.0 ohms.
C) 10-20 ohms.
D) 20-30 ohms.

Question 69

All of the following statements with respect to the speed sensors are true except:

A) They are variable reluctor sensors that produce an AC sine wave that can be interpreted by the transmission control module.
B) Most gas engines use the engine speed sensor.
C) The turbine speed sensor senses speed from the PTO gear mounted on the C1/C2 clutch housing.
D) The NSBU switch will prevent the truck from starting in any gear except park or neutral.

Question 70

The internal filter needs to be changed:

A) whenever the external filter is changed.
B) during every service.
C) during every alternate transmission service.
D) during the first transmission service.

Question 71

Tech A states that Allison transmissions use two trim solenoids to control pressure. Tech B states that the transmission uses two pressure control solenoids. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 72

You test the line pressure on an Allison transmission and find that the pressure is only 90 psi (621 kPa) in all gears. Tech A states that solenoid A could be in fail safe. Tech B states that solenoid B may not be energized. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 73

Tech A states that the shift solenoids in an Allison transmission are pulse width modulated to control the shift feel. Tech B states that the trim solenoids are proportional current solenoids. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 74

Tech A states that the two trim solenoids on an Allison transmission are both normally closed. Tech B states that one trim solenoid is normally open, while the other is normally closed. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 75

Which of the following statements is NOT true regarding the Allison transmissions?

A) The transmission uses no brake bands, one-way rollers, or sprags.
B) The transmission utilizes five clutches for all forward speeds as well as reverse.
C) The transmission requires different rebuild kits.
D) The 1000, 2000, and 2400 versions of the transmission are all relatively similar.

Question 76

Which of the following Allison transmission models does NOT come equipped with a parking pawl?

A) Allison 1000
B) Allison 2000
C) Allison 2400
D) None of the above

Question 77

Technician A says that the Allison 1000 transmission contains four shift solenoids. Technician B says that the Allison 1000 contains two trim solenoids. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 78

Technician A says that the diesel engine equipped Allison 1000 transmission uses an engine speed sensor. Technician B says the engine speed sensor is not used on gasoline powered engines. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 79

The Alison 1000 series transmissions has two filters. Technician A says that the outside filter should be replaced at each service. Technician B says that the internal transmission filter only needs to be replaced at the first service. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 80

Technician A says that during a shift, one of the two clutches from the previous gear will remain engaged. Technician B says that when shifting, one of the new gear clutches will engage. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician