Question about 1999 Chevrolet Tahoe

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How do i tell if my clutch packs are slipping or if my overdrive solenoid isn't working properly?

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Hook up scanner and go on road test. Only the start of the process. Leave it to the pros

Posted on Sep 29, 2009

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2000 Hyundai elantra shifts into overdrive but just slips.


Do you have a check engine light on? Any fault codes?

Jun 08, 2016 | 2000 Hyundai Elantra

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Transmission slipping before shifting into overdrive'


Clutch pack, s burnt out will have to be replaced.

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Shudder in reverse and seems to be slipping forward gears good


It is an auto I take it and the problem will be a reverse band/clutch pack solenoid servo. It it is a manual then the clutch works the same way in forward and reverse so if it was slipping in reverse ,it would also be slipping in forward gears as well. Run the fault codes to check for TCM and servo/solenoid faults.

Aug 18, 2014 | Cars & Trucks

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My 05 expedition slips when in overdrive but when I turn the overdrive off it stops slipping but won't go over 55mph


I would change the fluid about 4 times,not flush.

Next replace every solenoid in the pan area

Then the filter

If it has a solenoid pack, you get all that in one piece

Do not drive it one foot, until you resolve that issue,
that comes from someone who previously owned
a trans repair business

Fluid gets changed every 30,000 miles ,not
more than 3 years on ALL Vehicles and Power
Steering at same time

Mar 05, 2011 | 2005 Ford Expedition

1 Answer

My 88 ford thunderbird transmission slips on overdrive at all engine speeds. Its especially annoying on the highway lol i have the 5.0. its the auto overdrive transmission. the dealership i bought it...


No,1 quart won't cause slipping

A bad lock-up Solenoid or Worn Converter Clutch, Might

OD is another issue

ANY SLIPPING-and you will be completely
rebuilding it ,in a couple months

Feb 16, 2011 | 1988 Ford Thunderbird

1 Answer

No over drive


If you have a manual transmission model, check the wiring to the overdrive solenoid (M46,M47 transmission with type M overdrive) and check all fuses. This solenoid simply opens a check valve that allows the overdrive to function (DO NOT reverse the vehicle with the overdrive engaged or damage will result to the unit itself).
Automatic transmission models also have an overdrive override solenoid, bottom left side. If it is stuck in the override mode, check for shorted wiring to the solenoid. Also check the switch which can bind closed. If you can put a voltmeter on the wiring to the solenoid itself, check for voltage; if you have voltage and the switch is known good, the wiring is faulty. No voltage means the solenoid plunger is stuck down. Remove the solenoid and repair or replace it. In most cases replacement of a well-used item is better than repair.
All models: Always verify the condition of the wiring and connectors before condemning the unit. In most cases a voltmeter will rule out what the solenoid isn't doing. If you have voltage at the terminals on manual transmission models but no overdrive function, the solenoid has either seized or the coil has burned out. On automatic transmission models voltage at the terminals means the opposite: the solenoid will override overdrive and keep it in the third gear. No voltage for manual means no overdrive; no voltage on the terminals for automatic models means overdrive engages normally; if this is the case, replace the solenoid.
If, after all this checks out, on automatic models, this means that the transmission valve body has plugged up with deposits. For manual models, it means roughly the same (the overdrive is essentially a one-gear automatic transmission) and it also indicates that something is amiss with the hydraulic circuits, in both cases. Low line pressure can also cause this to happen in both types which means either the fluid is bad, the valve body is dirty, the screen is clogged or the main oil pump in the transmission (automatic models) is leaking. Always perform a thorough check before condemning either transmission type - they are conventional in design and very sturdy.
On AW-7x transmissions, no brake bands are used, therefore only clutch packs are employed. On the M46 and M47 manual models, the overdrive is a bolt on unit (type J or type M, depending on year). On the ZF series of automatic transmissions, the overdrive is integral to the transmission, being a true fourth gear. All models use a solenoid to control the upper gear range.
Note also that if you have the manual transmission, it may prove risky to rebuild it if you can beat the synchro by a quick change. Rebuilds offer up different wear surfaces to the case and can make a noisy transmission noisier.
Automatic models utilize clutch packs front to back. Band brakes were eliminated entirely, and when these start to fail the most noticeable problem is sloppy, hard shifting even after a fluid and screen job. The clutch wear surfaces decrease in friction holding and become thin. This implies loose clutches and this implies poor shift quality.
Always change the fluid completely (including the oil cooler, note it is thermostatically controlled) and clean the magnets of all debris. Introduce new oil into the system and test again.

Oct 22, 2010 | 1990 Volvo 740

3 Answers

The car will not shift into overdrive? All other gears work perfect? The problem just started tonight on my way home from my sisters. I got on the expressway accelerated up to 70mph and it just stayed in...


There should be an electric solenoid on the side of the transmission that controls overdrive, if it is not the cause then the friction plates inside the transmission will need to be replaced.

Apr 05, 2010 | 2000 Pontiac Grand Prix

2 Answers

1992 Mitsubishi Eclipse transmission slips in overdrive


well the low cost way to go first would be to try and change the trans fluids. If the problems still remains the it may be an internal problem

Feb 25, 2009 | 1992 Mitsubishi Eclipse

2 Answers

Towing with automatic in overdrive


Yes if you are going over hills on a daily If you have upgrades ie chiped you are putting more power to the wheels but first it goes through the trans you might want to put an aftermarket trans cooler to be safe. If you are in the city keep it out of O/D but on the highway it shouldn't hurt it. I put 20000 in the bed of mine and it pulls fine

Jul 18, 2008 | 2002 Ford F350 Super Duty DRW Reg. Cab

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