Exam 28: Allison 1000 and 2000 Series Transmissions

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?

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

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?

The Allison transmission is completely ________ controlled.

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 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?

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

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

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

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?

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

The resistance value of the torque converter clutch solenoid is:

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 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?