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YACT: Shift to second gear is rough

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psteng19

Diamond Member
This only happens in second gear.
Say I pull the shifter down to second from first... as I release the clutch, I'll feel and hear this awful noise (not really a grind), and I'll feel this vibration come through the clutch pedal (feels as if I'm driving over rough pavement).

If I bring the RPM's up a bit by applying a little throttle as I do this, it smooths things out a bit, but the shift is still very rough.

This also happens on a downshift, where if I shift from 3rd to 2nd, and just slowly ease out on the clutch, I'll get that rough vibration.

I do the same in any other gear and the shift is nice and smooth.
The clutch itself isn't really slipping yet, but I plan to replace it soon, within the next 5-10k miles).

1996 Nissan Sentra 5 speed 140k miles - original clutch.
 
Nissan_rough_shift

post count +1

Serious post though - it's just short of 10 years old, has 140k miles, and it's on the original clutch. It's probably due for a new one.
 
Nissan Shift_rough
LOL, I like that.

Anyway, I thought about it being the clutch as well, which is getting replaced soon, but why would it only affect second gear?
Since it was specific to one gear, I thought it was maybe the cog itself, or synchros?
Would tranny fluid fix a gear specific issue?
 
Synchros. Since there's typically a couple of synchros in a tranny, when you have trouble shifting into one or two gears (sometimes synchros are shared), that usually denotes a synchro problem rather than the clutch.
 
Doesn't sound like a clutch problem to me.

More like busted teeth in second gear. 🙁

Some trannys (MOST trannys) have magnetic drain plugs in them. Pull it and see if there is metal on the plug!
 
Originally posted by: psteng19
Nissan Shift_rough
LOL, I like that.

Anyway, I thought about it being the clutch as well, which is getting replaced soon, but why would it only affect second gear?
Since it was specific to one gear, I thought it was maybe the cog itself, or synchros?
Would tranny fluid fix a gear specific issue?
Click to expand...

Well, for myself anyway my new-used tranny had a 3rd gear grind. Tried 3 kinds of oil before I got to one that basically made the grind disappear.
 
Originally posted by: NutBucket
Originally posted by: psteng19
If it does come down to the gear itself or synchros, how much am I look at for repair?
Click to expand...

Cheaper to find a used tranny and replace it IMHO.
Click to expand...

If you have the time and space and patience (and enough :beer: ) to rebuild your own, then by all means do it! It's quite the learning experience. Auto trannys are or can be a lot harder to rebuild. But' you'd still wanna source a used one for now while you rebuild your current, unless you could do it in one day....
 
Originally posted by: TechnoKid
Originally posted by: NutBucket
Originally posted by: psteng19
If it does come down to the gear itself or synchros, how much am I look at for repair?
Click to expand...

Cheaper to find a used tranny and replace it IMHO.
Click to expand...

If you have the time and space and patience (and enough :beer😉 to rebuild your own, then by all means do it! It's quite the learning experience. Auto trannys are or can be a lot harder to rebuild. But' you'd still wanna source a used one for now while you rebuild your current, unless you could do it in one day....
Click to expand...

The only thing I don't really have to do tranny work is a press. I need to get one....if only I had somewhere to put it.
 
Originally posted by: TechnoKid
Originally posted by: NutBucket
Originally posted by: psteng19
If it does come down to the gear itself or synchros, how much am I look at for repair?
Click to expand...

Cheaper to find a used tranny and replace it IMHO.
Click to expand...

If you have the time and space and patience (and enough :beer: ) to rebuild your own, then by all means do it! It's quite the learning experience. Auto trannys are or can be a lot harder to rebuild. But' you'd still wanna source a used one for now while you rebuild your current, unless you could do it in one day....
Click to expand...

I don't have the knowledge, nor the time to learn it at this point.
Finding a used one in good condition is also going to be a pain... have to search through junkyards and online...
 
Do you know how to rev match? Or double clutch? You don't really need synchros, they just help you shift smoother. Double clutch on the 1-2 shift and see if you still hear the noises.
 
Originally posted by: CadetLee
Originally posted by: CombatChuk
It could be the throw-out bearing, or the synchronizers are worn out.
Click to expand...

If it was the TOB, wouldn't it act up on every gear?
Click to expand...

In most trannys syncro's are shared, first and third, and second and fourth. If it's only doing it in one gear, it is more than likely not a syncro. Same with a throw out bearing. If it was BAD, it would be bad in ALL gears.

Syncro's are made out of bronze as a rule so if you drain your fluid and it's coppery colored at the bottom after it's had a chance to settle, THAT'S syncro material. If it's silvery colored and a magnet can pick it up, thats GEARS. 🙁
 
throw out bearing?

I had issues with 2nd gear grind in the 240SX until I switched to Amsoil synth tranny oil. It fixed it right up.
 
Just leave it alone. My tranny does the same thing and has since I've owned the car. Put 15k miles of forced induction on it. 😛
 
My guess...if you're having the problem only when shifting between 2 gears, there is a chance that it is the clutch. The clutch could be slipping at the last moment before the gears engage. This would be worse between 1st and 2nd than any other gear because they 1 get the most use and 2 they occur at higher RPMs. I would go ahead and replace the clutch and see if this magically dissappears. If it doesn't, only then would I think it might have something to do with the gears.
 
Originally posted by: Scarpozzi
My guess...if you're having the problem only when shifting between 2 gears, there is a chance that it is the clutch. The clutch could be slipping at the last moment before the gears engage. This would be worse between 1st and 2nd than any other gear because they 1 get the most use and 2 they occur at higher RPMs. I would go ahead and replace the clutch and see if this magically dissappears. If it doesn't, only then would I think it might have something to do with the gears.
Click to expand...

Check the fluid FIRST before you do ANYTHING!!!

Also check your clutch fluid if you have a hydraulic clutch.
 
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