Transmission Noise?

[IamGlytchy]

I don't know if this has been posted before... but I'm having a rather specific issue that seems odd.


'94 Nissan D21 5spd with 98k miles


Just a few days ago I brought it into the local shop for new belts, oil pain gasket, and rear main seal. Had a small leak that I chose to have fixed before it became a big issue.


Problem is, since this service, the truck makes a metal-on-metal scraping noise only in 4th gear and only off throttle. No noise in any other gear, with clutch in, with throttle, or in neutral.


Seems odd that the issue is limited to 4th and off throttle, so I'm confused as to what it might be. Would like some opinions before I call the shop up and possibly throw a lot of money into transmission work.


Thanks in advance!

[SVTCTR]

without taking it apart i couldnt really tell you whats wrong. i havent taken one of these apart yet but have rebuilt a transmission for a Honda Civic and Ford Explorer 5spds. there are thrust bearing inside these. sometimes in in a couple spots. if you have any mechanical skills there really isnt much to these. just take off one part at a time and place them in order and find the part that bad or looks eaten up some.



or find another 5 speed from the junk yard and swap it out so that in the mean time you can try your hand at rebuilding. a junk yard trans is always a gamble but usually it works out. depending on your junk yard prices. not sure what part of Florida you are in but Picknpull in Tallahassee sells them for $104.99 plus $29.99 core but no D21s with a 5 spd right now.


transmission swap out doesnt take to long with a buddy. just pull the drive shaft, slave cylinder, shifter and unbolt the trans and walaa its out. a days worth of work and saved you a crap ton of money



sorta unrelated: i rebuilt the 94 Explorer 4.0L V6 trans using parts from a Ranger 2.9L I4 5 spd. everything matched up......except the gears were not a beefy.

[nunya]

Perhaps they dropped the tranny to change out the rear main seal? Perhaps they lost some tranny fluid, leaving you low? Just a guess, but first thing I would check. I prefer to pull my shifter boot and shifter to slightly overfill the tranny. Hey someone remind me what is the proper fluid for his tranny?

[cadillacdude1975]

Only genuine GL4.

[kellybig]

So the issue was not there prior to the shop performing their repair? It may be coincidental but if this is true I would take this up with the shop before spending my hard earned money. Not saying it’s shop fault but if they are reputable they should at minimum explore the issue.

[nissanhbuser3227]

Did you ever find out the issue? mine is a metal sliding noise after fluid change today also.


Buzzing and hissing

If the gear shifter or the shift linkage are making a hissing of buzzing noise while the car is moving, particularly while the vehicle is accelerating or decelerating, a loose bolt or worn rubber isolators in the shift linkage is the most common cause.
Other causes of these high-frequency noises include bent shift forks, shift rods, or interlocks, or even excessive movement in the synchronizer sleeves.
In all of these cases, the cause of the noise it is the shift forks contacting the grooves in the sleeves. This causes a hissing noise that travels through the shift linkage to the shift lever.

[89'HBV6]

IN calling IamGlytchy, are you still with us?

[YEPEE]

I believe there is a dust shield on the tail housing.. might be coming into contact with the driveline.. just a thought anyway

[nissanhbuser3227]

Me too are you there?