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Mor than likely damaged one of the planetary gear sets. Grinding in a trnasmission or rear end is a sign of loss of contact between meshing gears. Automatic transmissions engage two sets of gears internal to the trans to create a forward drive gear, changing between the gear sets creates different ratios anwhich in turn aloows for higher speeds. If the trans only grinds when in fifth range there is mopre than likely internal damage to the gears which 5th needs to operate. I would start by pulling the dip stick for the ****** and check for black or shiney material on the stick. I would then take a sample of oil from the trans by draining some from the drain plug if it has one, or possible drop the pan and check for foriegn matter in the fluid. Peices of metal shaving point to gear damage, and black material pont towards clutch wear/ damage. A worn or damaged clutch will cuase that specific gear not to engage and cause a grinding noise. Either way the concern is internal
It can be several things. If there is grinding noise it can be the clutch needs adjustment or replacement. Some vehicles have a hydraulic assist which can leak and fail. On those models the assist gives a mechanical advantage (boost) and makes the parts move easier.
If there is little or no noise your transmission can be low on gear lube. The shift mechanism is on the top of the trans and if the lube is low, the top of the trans will be dry. The manual transmissions are not like Automatics as they have no dipstick tubes. The manual transmissions rarely need additional lube. They do have a plug in the housing for adding lube.
well Im sure theres a ton of miles on it-do u perform reg maint like checkin fluid level-u may need the throttle cable ajusted that hooks to trans-band n clutch could be out of measure too--trans hydra-valve system could be worn--see all these things effect the way the fluid makes the gears move--a pressure test can confirm an aging trans
Hi, I hope this will help you , there is a part call the governor ,is on top of your transmision ,and looks like a distribuitor,,this have a plastic gear at the end of the shaft that wear out and dont let the transmition to shift ,,it have a ten mm bolt that holds it in place ,,,is a comon problem of nissan..... good luck.....