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there is not enough specif details available to be able to be close to exact But I will give an example that you can compare
in a manual transmission with a diff ratio of 3.909 and in 5th gear the rpms for 79 mph is 3200 rpms
the difference between gears is around 250 rpms so if you try to correlate the differences if it was in 4th gear the rpms would be around 3750 rpms so I suspect that the over drive section of the transmission is not engaging ( assuming that it is auto transmission)
so to answer your question , I am saying that it is too high in rpms for that speed and I suspect that the od is not being engaged as the rpms at 80mph I would be looking at around 3200-3500 rpms depending on the diff ratio
You don't provide much information to go on (type of vehicle, type of engine, 2wd or 4wd, etc.) RPM is always going to be based on the speed you're traveling with a standard transmission. My 4 cyl 5 speed Nissan pickup in 5th gear runs at 3000 RPM at about 75mph.
The transfer case is stuck in the low range. If manual shift try shifting from low to high several times to see if free up. If electronic, check all fuses and make sure you hear transfer case change range. Do this by shifting with key on engine off. If no change refer to qualified transmission mechanic.
Hi my name is mike ,if it only happens in 5th gear it is more than likely the syncro gear that is causing this the sycro gear is on all the gears and allows the gears to mesh together easily when you shift into gear ,usually it give people the problem when the car has alot of miles onit and its mostly when you try to shift into that gear it will be hard to go in or not go in all the way and then fall out of gear ,this one sounds like it may have rough spots on the syncro and it holds it on gear, it comes out of gear when you speed up and let off because when you speed up then let off it takes some of the pressure off the gear and then it will release ,hope this helps ,most likely you will have to put another transmission in .let me know if you have any Q's
have the oil checked if needs to replaced sounds if the level is low or that you may have to rebuild the tranmition or you can buy one at a scrap yard you may be lucky and get one from a accident car that may have less miles on
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