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Overdrive slips ive lost just the OD, all other gears are fine?

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Check fluid level od is first to go when fluid gets low

Posted on Nov 15, 2008

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This could be a serious transmission problem rearing it's ugly head. I'm assuming your transmission is not getting bad signals from the electronic controls. That should generate a trouble code and give you a check engine light in most modern cars.
The transmission is essentially a hydraulic device. A built in pump uses the transmission fluid to slide clutch packs into and out of engagement to shift gears. Shifting problems indicate there is not enough fluid pressure to make the shift. This can be caused by low fluid levels, clogged fluid filters or problems in the control valves. Fluid level you can check. The exact procedure is in your owners manual but for most cars should be done with the engine and transmission well warmed up and running with the transmission in park.
overdrive slips - 4bf4ddb.jpg (typical front drive tranny cutaway)

The real problem here is that eventually the overdrive clutch packs will be damaged if you keep driving with them slipping. The clutch packs are deep inside the transmission and require some special tools and a certain amount of skill to replace not to mention the removal of the transmission. So again assuming you don't have a high-tech, electronically controlled transmission, I would take it to a good repair shop or three and get estimates on having it serviced.

Posted on Nov 15, 2008

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Engine light code says gear 4 out of ratio. I was told it was the OD going out. Do I have to replace the entire transmission, or can I just have the OD fixed?

Overdrive is actually inside the torque converter. Look at the transmission control module. Have it tested for proper operation first. There is a solenoid inside the transmission on the valve body that the module operated. Since you didn't get a fail on the solenoid, the OD clutches may be worn enough to slip. No need to replace the entire transmission, just the torque converter.

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I lost reverse and overdrive is slipping and humming at low speeds on my 4.3L two wheel drive '97 sonoma! Does this mean a whole new rebuilt/swap transmission or can it be something less such as a

Yes it can be transmission issue,as per the problem.In this condition i suggest to you to go through the procedure mentioned in following help links.Click the link below and go through troubleshooting procedure to confirm the problem :-----Engine stumbles and shuts off in forward gear? problem?
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1 Answer

It feels like its slipping when its in OD and not so much in the other gears. The fluid level is good.

It may be slipping in any gear its time for a rebuild, the clutches are wearing out.

If its just in overdrive, then you can get it fixed now and may be a little cheaper

Nov 13, 2009 | 1988 Buick LeSabre

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sorry to say this trans has to be removed and rebuilt seems like od clutches burnt out-do you tow heavy trailer with truck as you have to tow with od off(push button on shifter)

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the OD shift solenoid is malfunctioning or has failed. changing this will bring back the OD. the solenoid is located in the bottom of the transmission pan.

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you may have damaged the overdrive gear, a local transmission shop would be your best bet. for good troubleshoting and estimate.

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