Question about 1987 Dodge Ram 50

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Overdrive problems Transmission wont go over 60mph in overdrive. All other gears shift fine but once I get up to 60 and tachin about 2400 rpm it just cuts out and wont go any faster. Does anyone know whats going on or had this problem?

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  • donbigfoot Jun 27, 2009

    I have gone over 60 before so its not a govenor. I have been driving the truck for about a month with no problems.

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It might have been a former rental car that means it could have govenor on it.but by it being an 87 it might just need to have tune up

Posted on Jun 27, 2009

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2007 M35 automatic transmission shift gears fine, but after last gear is shift the overdrive remains on. The RPMs seem a bit high when driving above 60. Any thoughts?


Sounds like the lock up in the torque converter is not locking up so your RPM's should be running about 500 rpm's higher. If I am correct either it went bad or not getting signal. I do not repair so I would say to take it to a transmission shop that you trust.

Jan 06, 2016 | Cars & Trucks

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Car drives good but high rpm at 60 mph rpm is like 3000


Does your car have an overdrive or economy mode? 3000 is about right if you're going uphill at 60, your car is under heavy load or your not in overdrive. It could also be that your car hasn't shifted up to the next gear. On many automatics you can stomp on the gas pedal twice quickly, all the way to the floor, and that will make it up shift. Try that to see if that lowers the rpm's and gets it to shift up. If your car still wont up shift check the transmission fluid level with the car warmed up and running.

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For Automatic transmission problem,click the link below:----Overdrive light in the dash blinks? http://repairhelpcenter.blogspot.com/2012/01/overdrive-light-in-dash-blinks.html
--------- Automatic transmission troubleshooting:----

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

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http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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This will help.

Thanks.

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1 Answer

1994 shift only when overdrive is off.


first thing to check is transmission oil level and quality. If that is fine than your looking at either a valve body problem (valve body is what controls the selection of gears) or possibly a problem with the bands on the planetary gear set, they can be tightened in certain models. However i dont think it is the bands.
Does the overdrive only engage 4th gear? or does it feel like the gear ratios are different between overdrive and normal before the problem happened? some overdrive buttons engage final gear and some do as much as change gear ratios like in a cvt (contantly variable transmission) and some just change the timing in the gear changes to provide more rpm/power.
My best guess is that the valve controlling the overdrive in the valve body has failed and therefor you dont get a response from the transmission (i.e no gear shifting when overdrive is selected)

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1 Answer

I have a 1997 Kia Sportage (#KNAJA5278VA787759). The automatic transmission used to not shift into overdrive at 60 km/hr, but only after the engine was warm--after about 5 km of driving. The problem...


I had a simular problem.
Ended up changing the themastat and the gears changed into overdrive when the temp. got to normal running.
Be carefull that you get right thermastat though. You want one that reaches the normal working Temp as soon as possable.
Hope this helps.

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1 Answer

RPM's running alittle high at 60mph


ram1105: when you shift out of overdrive the transmission actually is in a 1-1 ratio with the input shaft of the transmission. Meaning for every revolution of the input shaft, the driveshaft turns the same number. When you shift to overdrive, the ratio changes allowing the engine speed and input shaft speed to slow down while the number of RPM's increases on the driveshaft shaft. The change is not too significant. Usually about a 500 RPM change is normal. You may have a problem with slippage within the transmission overdrive unit.
It may be advantageous to have the transmission pan dropped and it's contents inspected for debris. Older Nissan Automatics were not known for failures. The 3N71B was bullet proof and the 4N series which was just an overdrive added to it, were very reliable.
My son, best friend and I road race Nissan 300Z's. There are a variety of gear ratios for the R200 differential. The 3:70 is the tallest factory setup on a production Z, which would give you the lowest RPM at a higher speed. Outside of that, the tallest tires you can run on the car will also lower the RPM's.Don't forget there is always a trade-off. When you make a gear and change to taller gears, the car is going to feel more sluggish off the line. It will take longer to attain 0-60 unless you increase HP & Torque. I can help you there if you want to know how to do it.

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