Transmission Grinds When Slowing Down??

cubaguy · 07-29-2010, 08:08 PM

Problem Im having is when I accelerate in any gear the car makes no grinding or scraping noise.... but if i keep it in gear and let off gas to slow down it makes a grinding/scraping noise

Happens loudest in 1st.....2nd is quieter.... and third isnt noticable unless you listen for it

Whats dumb is if your in fourth or fifth it doesnt do it at all.... it only doenst while slowing down in gear.... not while accelerating

Dropped clutch several times and it has wonderful hold and everything.... shifts wonderfully.... every gear is smooth.... reverse works great and everything so im completely lost here....

wondering if i should go and buy a new trans? clutch?

Mikester · 07-29-2010, 10:41 PM

When is the last time you changed your tranny oil? My rule of thumb is to change the tranny & diff oil every other oil change. Also, you may consider a heavier grade oil, or maybe consider the OEM recommended grade if you are not sure what kind is currently in there. BTW- Synthetic synthetic synthetic...

The reason you will hear the sound when decelrating in the bottom two gears is that 1st & 2nd gear are lower than 3rd & above, and under much more of a load, which is why when engine braking, the car will slow down dramatically faster when shifting down from 3rd or above to 2nd or below.

Basically, the tranny's function is to work FOR the engine... Under decel, it's working against it... Which in some ways is harder on it. Depending on whether the grind is a grind or a whine, you MAY be losing 1st & 2nd gears, but I'll bet it's something simple.

I highly doubt your tranny is about to let go if everything feels smooth when shifting etc.

Reverse is pretty stout- does it do it when decelerating there too?

cubaguy · 07-29-2010, 10:54 PM

No doesnt do it in reverse.... but yeah changed the oil yesterday in the tranny.... 75w-90 gear oil... took 3 hours to gravity feed that crap in.... when i drained it was pure black.... still did it as soon as i drove off... drove it this morning and still going.... so going to change out rear end i think tomorrow morning

**aled** · 07-30-2010, 12:48 AM

+1 to Mikester.

Do you have an aftermarket shifter?

cubaguy · 07-30-2010, 10:39 AM

No aftermarket shifter that i know of

cubaguy · 07-31-2010, 08:42 AM

Swapping rear end fluid in few.... I know the noise is coming from the trans but who knows

Mikester · 07-31-2010, 09:00 AM

Not sure whether you have a 13 or a 14... In perspective, your car is old, and so is your transmission... Trannys will get a little whiny over time, it's just the nature of the beast, and why there are transmission shops in most towns & cities.

I get a grind in my diff when rolling backwards in my 240 for some reason... Not the diff that is staying with the car... But said to illustrate the point that things wear out over time and the best you can do is take the best care you can of them... ESPECIALLY if you like to drive hard.

cubaguy · 07-31-2010, 09:05 AM

Oh yeah its a s14 sorry about that.... well i drove it last night a tad... cruised with door open and head down bottom to listen for noise.... had a friend sit in passenger and listen for noise and he also said tranny.... but its not a wine.... yeah uncle is down fro illinois and he mechanic for international diesels so have him check it to get his 2 cents lol

**Gregman** · 07-31-2010, 11:15 AM

i have a s14 trans i will sell you.
lmk

cubaguy · 08-01-2010, 03:12 PM

PM'd

cubaguy · 08-02-2010, 10:14 PM

Changed the fluid in the rear end today.... black as shit.... checked the fluid in the trans and its still good.... while i was working on the car i jacked up the rear end and put the car into gear and jumped under to check for the noise.... the sound is coming from the front of the transmission where it mounts up to motor....

Whats the odds of the clutch just going out.... like i said it only makes the noise in 1st,2nd,and 3rd

Mikester · 08-03-2010, 01:50 PM

Could be your pilot bushing, HORRIBLE noises happen when they go bad... If you are going to take out the tranny, it would be damn near criminal to not change the clutch, tob & pilot bushing, as well as resurface the flywheel & get a NISMO pivot ball...

cubaguy · 08-03-2010, 02:03 PM

Yeah i know.... if i drop the tranny im doing a full tune up on everything. no reason to drop it just for 1 bearing... dumb

Mikester · 08-03-2010, 08:47 PM

Word... ALso, if you're going to do the TOB, might as well redo the sleeve as well... And the slave cylinder too lol... Either way, good luck dude!

cubaguy · 08-04-2010, 02:17 PM

yeah... i think im just going to drive till i get money needed to fix and then pull and do all at once...

07-29-2010, 08:08 PM	#1
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	Transmission Grinds When Slowing Down?? Problem Im having is when I accelerate in any gear the car makes no grinding or scraping noise.... but if i keep it in gear and let off gas to slow down it makes a grinding/scraping noise Happens loudest in 1st.....2nd is quieter.... and third isnt noticable unless you listen for it Whats dumb is if your in fourth or fifth it doesnt do it at all.... it only doenst while slowing down in gear.... not while accelerating Dropped clutch several times and it has wonderful hold and everything.... shifts wonderfully.... every gear is smooth.... reverse works great and everything so im completely lost here.... wondering if i should go and buy a new trans? clutch? __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

07-29-2010, 10:41 PM	#2
Mikester Knowledge Seeker Bucket, coils, lsd Join Date: May 2009 Location: South City, St. Louis Posts: 421	When is the last time you changed your tranny oil? My rule of thumb is to change the tranny & diff oil every other oil change. Also, you may consider a heavier grade oil, or maybe consider the OEM recommended grade if you are not sure what kind is currently in there. BTW- Synthetic synthetic synthetic... The reason you will hear the sound when decelrating in the bottom two gears is that 1st & 2nd gear are lower than 3rd & above, and under much more of a load, which is why when engine braking, the car will slow down dramatically faster when shifting down from 3rd or above to 2nd or below. Basically, the tranny's function is to work FOR the engine... Under decel, it's working against it... Which in some ways is harder on it. Depending on whether the grind is a grind or a whine, you MAY be losing 1st & 2nd gears, but I'll bet it's something simple. I highly doubt your tranny is about to let go if everything feels smooth when shifting etc. Reverse is pretty stout- does it do it when decelerating there too? __________________ IN THE UNIVERSE, THERE ARE TWO CONSTANTS: Hydrogen and Stupidity

07-29-2010, 10:54 PM	#3
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	No doesnt do it in reverse.... but yeah changed the oil yesterday in the tranny.... 75w-90 gear oil... took 3 hours to gravity feed that crap in.... when i drained it was pure black.... still did it as soon as i drove off... drove it this morning and still going.... so going to change out rear end i think tomorrow morning __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

07-30-2010, 12:48 AM	#4
aled Driver I am so over drifting Join Date: Dec 2008 Location: Chesterhood, MO Posts: 1,539	+1 to Mikester. Do you have an aftermarket shifter? __________________ Control Freaks Enkei\|PBM\|Exedy\|Recaro\|Greddy\|Sparco\|Sard\|Tein

07-30-2010, 10:39 AM	#5
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	No aftermarket shifter that i know of __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

07-31-2010, 08:42 AM	#6
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	Swapping rear end fluid in few.... I know the noise is coming from the trans but who knows __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

07-31-2010, 09:00 AM	#7
Mikester Knowledge Seeker Bucket, coils, lsd Join Date: May 2009 Location: South City, St. Louis Posts: 421	Not sure whether you have a 13 or a 14... In perspective, your car is old, and so is your transmission... Trannys will get a little whiny over time, it's just the nature of the beast, and why there are transmission shops in most towns & cities. I get a grind in my diff when rolling backwards in my 240 for some reason... Not the diff that is staying with the car... But said to illustrate the point that things wear out over time and the best you can do is take the best care you can of them... ESPECIALLY if you like to drive hard. __________________ IN THE UNIVERSE, THERE ARE TWO CONSTANTS: Hydrogen and Stupidity

07-31-2010, 09:05 AM	#8
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	Oh yeah its a s14 sorry about that.... well i drove it last night a tad... cruised with door open and head down bottom to listen for noise.... had a friend sit in passenger and listen for noise and he also said tranny.... but its not a wine.... yeah uncle is down fro illinois and he mechanic for international diesels so have him check it to get his 2 cents lol __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

08-01-2010, 03:12 PM	#10
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	PM'd __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

08-02-2010, 10:14 PM	#11
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	Changed the fluid in the rear end today.... black as shit.... checked the fluid in the trans and its still good.... while i was working on the car i jacked up the rear end and put the car into gear and jumped under to check for the noise.... the sound is coming from the front of the transmission where it mounts up to motor.... Whats the odds of the clutch just going out.... like i said it only makes the noise in 1st,2nd,and 3rd __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

08-03-2010, 01:50 PM	#12
Mikester Knowledge Seeker Bucket, coils, lsd Join Date: May 2009 Location: South City, St. Louis Posts: 421	Could be your pilot bushing, HORRIBLE noises happen when they go bad... If you are going to take out the tranny, it would be damn near criminal to not change the clutch, tob & pilot bushing, as well as resurface the flywheel & get a NISMO pivot ball... __________________ IN THE UNIVERSE, THERE ARE TWO CONSTANTS: Hydrogen and Stupidity

08-03-2010, 02:03 PM	#13
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	Yeah i know.... if i drop the tranny im doing a full tune up on everything. no reason to drop it just for 1 bearing... dumb __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

08-03-2010, 08:47 PM	#14
Mikester Knowledge Seeker Bucket, coils, lsd Join Date: May 2009 Location: South City, St. Louis Posts: 421	Word... ALso, if you're going to do the TOB, might as well redo the sleeve as well... And the slave cylinder too lol... Either way, good luck dude! __________________ IN THE UNIVERSE, THERE ARE TWO CONSTANTS: Hydrogen and Stupidity

08-04-2010, 02:17 PM	#15
cubaguy Corky 92 240sx Clutches hate me Join Date: Aug 2009 Location: Cuba, Missouri Posts: 178	yeah... i think im just going to drive till i get money needed to fix and then pull and do all at once... __________________ If I'm driving it, it's breaking. -92 240sx 5-speed Red 96k original miles -95 240sx 5-speed Pearl White Project

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