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Mower slips in fourth gear

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My 2005 Pontiac Bonneville GXP will not shift into 4th gear I was to it was a fourth gear band but is that the only problem that will cause itI'notto shift into 4th gear


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)

Dec 06, 2015 | Pontiac Cars & Trucks

1 Answer

'92 Metro ****/slips in second and high. Sometimes needs to be manually shifted


Pull the trans & rebuild it

IT SLIPS-why ask-- when it slips

That is internal wear & problems

NO FIX for slipping

Oct 08, 2014 | Cars & Trucks

1 Answer

My 2000 jeep grand cherokee is slipping into fourth gear i recently had the pcm fixed and cylanoid replaced on it and ideas on what it can be every thing else seems fine on it.


did the replace the PCM which is the brain or did he replace the transmission control module in front of the transmission. if the mechanic just PCM then you need the transmission control module

Dec 16, 2012 | 2000 Jeep Grand Cherokee

1 Answer

2003 C3500 Manual Transmission


sounds like the syncro for fourth gear is warn out you need to take it apart to repair it

Jul 17, 2012 | Cars & Trucks

1 Answer

We have a March 2002 model, so far it has had 3 new clutches. We now have the problem that when the car is in fourth gear, it slips out frequently. No gearbox noises or problems when in other gears. The...


I will assume you bought the vehicle used

The transmission has been somewhat abused &
will have to come out to fix the fourth gear problem

There is no reason to have 3 clutches put in a vehicle that
is 9 years old
Again,abuse,poor driving habit & most certainly poor quality
parts & workmanship on all the clutch service

I will go so far as to say ,none of the clutch work was ever done
correctly any time,no matter how you drive.

Jul 12, 2011 | 2002 Hyundai Santa Fe

1 Answer

My transmission slips in fourth gear what is the problem?


The fourth gear, or over drive gear is burning out transmisson is in need of overhaul or replacement.

Mar 26, 2010 | 1992 Mercury Grand Marquis

1 Answer

1997 Chevy P-32 step van (panel van, delivery van) with 4L80-E transmission: Truck drives and shifts properly in gears one through three, but slips as soon as it shifts into fourth. It will not pull at all...


the fourth clutch is burnt probably due to a bad 4th clutch piston seal... if you can get a good trans that cheap then you should just put one in it unless you are familiar with internal trans repairs...

Oct 13, 2009 | 1997 Chevrolet K1500

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