What would cause

Automatic Transmission Slipping

www.aa1car.com/library/transmission_slipping.htm

Transmission slipping may be caused by several things: ... there must be enough fluid to generate the internal pressure required to engage the various gears.

Top 10 Signs of Transmission Trouble - HowStuffWorks

auto.howstuffworks.com/under-the.../5-signs-transmission-trouble.htm

It may happen when trying to get into first gear from a stop, or at any point up and down the assorted gears. Common causes include low transmission fluid, ...

10 Most Common Transmission Problems

www.transmissionrepaircostguide.com/10-common-transmission-proble...

A clunking sounds when you shift gears almost always lies within a .... If the transmission is spontaneously slipping in an out of gear (or simply popping into ...

Transmission Slipping - Transmission Repair Guy

Transmission Slipping: What Causes It and How to Fix It ...

www.autos.com > Car Maintenance

Oct 7, 2013 - To understand the causes of transmission slipping and how it can be fixed, you ... An auto transmission is the gear that transmits power from the ...

Which transmission does yours have 4T65-E or 4T80-E ?

4T80-E
No Fourth Gear

Checks

Causes

1-2 Shift Solenoid Valve
?€¢
Inoperative
?€¢
Debris
?€¢
Pinched wires

3-4 Shift Valve Bore Plug

Misassembled

4th Band

Burned, slipping, missing

4th Servo Cover

Cracked

4th Servo Pin

Broken, seized

4th Servo Piston

Damaged

4th Servo Seals

Rolled, cut or damaged
4T65-E
Slipping or No Fourth Gear
Slipping or No Fourth Gear Checks
Cause

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)

If your fluid level is right you may have a bad transmission. you need to talk to a mechanic.

Sounds like the friction surface of the clutch disc is slipping. You would have to install a new clutch (clutch disc, pressure plate, and clutch release bearing), and have the flywheel surface cut and polished back to perfect smooth by a shop.
Manual transmission gears don't slip like automatics. And lack of fluid in the transaxle or the hydraulic clutch system won't cause this either.

.One of the most common causes of a slipping transmission is a low automatic transmission fluid level, also a dirty and/or clogged automatic transmission filter can impede the normal flow of automatic transmission fluid throughout an automatic transmission and cause the transmission to slip. Adequate, unobstructed transmission fluid flow is necessary for the optimal operation and function of an automatic transmission, including the function of the transmission bands and gears, two transmission components that routinely cause transmission slippage.Another cause would be faulty torque converter action and maladjusted transmission band.

SAE 80W gear lube

Absolutely; Automatic transmissions will slip for a number of factors but the the #1 cause is low fluid level closely followed by very old and brown fluid. Recomended fluid is MerconDexronII. Best of luck.
Greg

The problem is most likely internal. Sounds like it could be the synchronizer or maybe the gear itself. Hard to say until you take it apart and look at it. I guess a price range of around $1000-$1500 to rebuild, repair costs depend on what parts needed, cost of parts, labor/time involved.

I have a 2002 Mazda Protege automatic, I has been slipping more so when it is warm up. No engine light detectedand it starts up fine. Just when I am riding it tends to jump in and out of gear. Last check, we were told that the trand oil level were fine. Can you tell me what may be the problem.