Question about 1988 Ford Thunderbird
Transmission is rebuilt and does not get 4th gear. Have changed solenoid and valve body. Have gone thru transmission already twice can't find cause. Checked external connector for power ok. At times would take off in 2nd gear then it gets 4th gear . Any time it takes of in 1st gear it does not get 4th gear
Its the ecu on the passenger side i went thru 3 trannys in 4 months and they finally looked for the problem because the tranny was under warenty and they had to keep fixing it for free
Posted on Jul 24, 2009
call a dealer and they will tell you you are suppose to change your transmission fluid every 2 years or 30,000miles but if you was carrying this much load you may have over heated the transmission so I would shop around and get a good deal at a transmission place where they can replace the filter and the fluid and adjust the bands on the transmission if needed
Posted on Jan 13, 2009
check the gear linkage first for smooth operation, then check/or change your gearbox fluid with the following (before going and ordering a gearbox rebuild - it's much cheaper). Make sure you have it filled to the correct level (see below).
The reverse switch is located on the gearbox, and the switch I have heard, do fail (or you have a short in it's wiring).
Manual transaxle and transfer case:
Hypoid Gear Oil, SAE 75W-90 or 75W-85W conforming to API classification GL-4
Hypoid Gear Oil API classification GL-5 or higher
Above -23ºC (-10ºF)
SAE 90, 85W-90, 80W-90
From -34ºC (-30ºF) to -23ºC (-10ºF)
SAE 80W, 80W-90
Below -34ºC (-30ºF)
Lubricant capacities (from the service manuals)
Manual transaxle [to bottom of filler hole]:
FWD: 2.3 L (2.4 qts)
AWD: 2.4 L (2.5 qts)
Posted on Aug 15, 2009
have you checked all fuses under the hood? have you checked the fuel pump relay? you may be able to swap the fuel pump relay with amother relay in the fuse box.are you getting power into and out of the reset switch? from there it goes to the fuel pump. if power is getting to the fuel pump and it has a good ground, the the pump is bad.
Posted on Sep 27, 2009
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Posted on Jan 02, 2017
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1-2 Shift Solenoid Valve
3-4 Shift Valve Bore Plug
Burned, slipping, missing
4th Servo Cover
4th Servo Pin
4th Servo Piston
4th Servo Seals
Rolled, cut or damaged
Slipping or No Fourth Gear
Slipping or No Fourth Gear Checks
DEFINITION: A large engine RPM increase is noted in fourth gear, Drive range, with little or no vehicle forward speed increase. First, second, and third gear operation are normal. Shifts into fourth gear are soft or do not occur. Fourth gear ratio is 0.705:1.
Automatic Transmission Fluid Level
Low fluid level
Transmission Main Line Pressure
Low transmission main line pressure
Oil Filter Assembly
• The oil filter assembly (100) is missing, plugged, or damaged.
• The oil filter seal assembly (101) is missing or is damaged.
Control Valve Body Assembly
• The 3-4 shift valve (362) or the 4-3 manual downshift valve (360) is stuck or binding.
• Debris is found in the passages of the control valve body (301) or of the control valve body spacer plate and gasket assembly (396)
Case Cover Assembly
Distortion or damage occurs at the manual valve (404) or at the case cover (401), causing PRN oil leak.
Driven Sprocket Support Assembly
A plugged third clutch oil passage in the driven sprocket support assembly (609)
Fourth Clutch Assembly
• The clutch plates (500-502) are worn, damaged, or misassembled.
• A missing or not seated fourth clutch spring retaining ring (601)
• A damaged spring assembly (602) or piston (603)
• Worn or damaged fourth clutch piston seals (604, 605)
Third Clutch Sprag Assembly
• The sprag (720) was misassembled or backwards on the inner race (661).
• A damaged third clutch sprag assembly (653, 661, 719-721)
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