Volvo

USATransdoctor.com
These recommendations do not cover all possibilities. They are some things to check before you have your transmission rebuilt. Always check transmission fluid level first. Always run a scanner on any computer controlled transmission. On modulated transmissions make sure they have enough vacuum.

70 Series	1998-00 2.3/2.4L AW50-42LE
90 Series	1998 3.0L A341E
240	1985-92 2.3L AW70	1992-93 2.3L AW70L
740	1985-89 2.3L ZF- 4HP22 Diesel	1985-90 2.3L Turbo AW71	1985-91 2.3L AW70
	1990-92 2.3L AW70L	1990-92 2.3L AW72L	1990-92 2.3l turbo AW71L
760	1985-90 2.3L Turbo AW71	1985-90 2.8L AW71
780	1987-90 2.3L Turbo AW71	1987-90 2.8L AW71
850	1993-97 2.3/2.4L AW50-40
940	1991-97 2.3L AW72L	1991-97 2.3Lturbo AW71L
960	1993-97 2.9L A341E
S80	1999 2.4L AW50-42LE	1999 2.9L 4T65E

4T65E
The transmission above is a 4 speed automatic that is computer controlled. If your check engine light comes on, or the transmission starts shifting erratic or not at all.

Make sure you or a shop runs a scanner on the vehicle. You want to see if a sensor has gone bad causing your problem. Always check your external sensors first.

ZF4HP22
The transmission above is a rear wheel drive 4 speed automatic and shift timing is controlled by a throttle pressure cable that connects from the transmission to the carburetor or throttle body.

Always check these items first before your purchase a transmission. Also make sure your clutch fan on the front of the motor is not starting to seize up. This causes the engine to sound unusually loud almost like the transmission is not shifting into 4th gear.

AW341E
The transmission above is a rear wheel drive 4 speed automatic transmission. This transmission is computer and throttle pressure controlled. Common symptoms are transmission shifting erratic, slipping or not shifting at all.

Always check your throttle pressure cable adjustment to see if it is causing the problem. On most of these models, they have a diagnostic box you can retrieve codes with. The location of this box should be in your owners manual. If you don't have a diagnostic box then run a scan nner.

AW70 / AW70L / AW71 / AW71L / AW72L
The transmissions above are rear wheel drive 4 speed automatics and shift timing is controlled by the computer and a throttle pressure cable that connects from the transmission to the carburetor or throttle body. Common symptoms are transmission shifting erratic, slipping or not shifting at all. Also the check engine light can come on.

Always check your throttle pressure cable adjustment to see if it is causing the problem. On most of these models, they have a diagnostic box you can retrieve codes with. The location of this box should be in your owners manual. If you don't have a diagnostic box then run a scanner. Always check these items first before your purchase a transmission.

Make sure your clutch fan on the front of the motor is not starting to seize up. This causes the engine to sound unusually loud almost like the transmission is not shifting into 4th gear.

AW50-42LE / AW50-40
The transmission above is a front wheel drive 4 speed automatic transmission. This style transmission is computer and throttle pressure controlled. Common symptoms are transmission shifting erratic, slipping or not shifting at all. Also the check engine light can come on.

External sensors like the throttle position sensor, vehicle speed sensor or output speed sensor quite often go bad, causing these symptoms. Always check your throttle pressure cable adjustment to see if it is causing the problem. On most of these models, they have a diagnostic box you can retrieve codes with. The location of this box should be in your owners manual. If you don't have a diagnostic box then run a scanner. Always check these items first before your purchase a transmission.

Check the shift solenoids that attach to the valve body, sometimes they can go bad.