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If the tachometer is increasing (or you can hear the engine reving faster), then the transmission may be slipping - assuming constant speed. You should check the auto transmission fluid level at once. Low fluid can cause this. Slipping usually will happen when the transmission is hot - so it is less likely to happen when - for the first few miles. Most auto transmissions require checking be done when hot, and idling in park on a level surface. The fluid should be pinkish-red and have an oily smell. Brown colored and burnt smelling fluid is not a good sign. You may be able to flush and fill the transmission to save it - - but no one will tell you it will definitely work or not. Good luck!
You should first fill the transmission fluid to the correct with genuine Nissan Matic J Transmission fluid and replacing the transmission input shaft speed sensor. Its costs approximately $113 at the dealer for the sensor.
Check your tranny fluid levels- if they are low your transmition will slip between gears, however if you notice any kind of free reving while its shifting (like being reved up when in park or neutral) then the hydrostatic clutches are slipping and the transmition needs repair.
Another thing you should investigate is your transmition kick down bar (it shifts the trany into a lower gear when accelerating hard to help pick up speed.
ur computer probably wont show anything ur tranny problem can be anything fron needing a filter changed to vacuum problem to torque converter check the fluid for level if low fill up- before filling look and smell fluid it should be reddish in color not brownish [fluid burnt]if it smells burnt- need trans service can be just a filter and flush ,bad sensor-actuator or rebuild
you could have blown the head gasket the only real way to test for this is whats called a "sniffer test" they **** some water out the rad and test it to see if there is any hydrocarbons in it if there is the head gasket has blown also if you over heated the motor you may need a new set of spark plugs, as for the leaky rad, get some "rad seal" or "rad weld" and tip that in the rad that normaly stops the leak for a year or so,
Without seeing first hand, it's difficult to nail down the problem for a solution... but based on your description I would make it a first and foremost priority to resolve the oil leak. As you know, oil reduces friction in an engine. It is vital for the life of it. No oil = friction, overheating, and worse, damage to the engine.
The clattering could be because you are losing oil enough that there isn't sufficient lubrication for the engine, especially when reving up the rpms.
Fix this... Hope this helps... Good luck!
So the truck is siting in I 95? Is the trans fluid level correct? What is the color of the fluid, does it smell burnt and have a burned appearance?
The fluid must be low as it is improbable that burned out alll of the clutches at once or the primary pump completly, Have the trans fluid and filter changed and see what happens.
Has the truck ever stopped running after high speed before? I do not think the two problems should be conncected. When it stopped, did it dies likethe key was shut off or did t just loose more and more power?