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Old 02-13-2014, 02:08 PM   #1
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2nd gear acting up in my NV3550

Hey fellas. Got an '03 TJ, 4.0/5spd. Its my daily driver. Ive had it for about 4 years now, and ever since I bought it, its been going into 2nd gear a bit hard. Recently (especially with the cold weather) it started grinding when downshifting into 2nd. I figured the syncro was toast. But incase it might be the slave cylinder, I tried pumping the clutch a few times between gears, and it seemed to help most of the time, but not consistently. The other day when pulling into work, I noticed my 2nd gear was a bit noisy. Just out of curiosity, I tried starting from a stop in 2nd gear. As soon as I engaged the clutch, it popped right out of gear, making me think the gear is chewed up. But Ive tried that again since, and it stayed in gear just fine.

Im not sure where to start looking. Is the gear worn? Is the slave cylinder bad? Is it the syncro? Or is it just a bad bushing in the shifter? If anyone knows of any common problems that I should look at first, please let me know. Im at a loss, and I have to drive this thing every day, so I cant tear it all apart just yet. Thanks

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Old 02-13-2014, 02:11 PM   #2
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By the way, my Jeep only has 86k miles on it, and Ive been careful about fluid changes and how I drive it, which makes me wonder even more.

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Old 02-13-2014, 07:16 PM   #3
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The grinding 2nd gear on the NV3550 is a common issue. Similar to the older transmission in reverse gear. 85,xxx is a bit early, but mine started at 115,000 too.
I believe it is the synchro that is gone. Can't imagine it is the slave cylinder or the other gears would be bad too.
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Old 02-13-2014, 07:28 PM   #4
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The grinding 2nd gear on the NV3550 is a common issue. Similar to the older transmission in reverse gear. 85,xxx is a bit early, but mine started at 115,000 too.
I believe it is the synchro that is gone. Can't imagine it is the slave cylinder or the other gears would be bad too.
They are not similar at all. The older transmissions grind occasionally in reverse because they aren't synchronized.
The NV3550 is synchronized in 2nd gear. It's possible that his 2nd gear synchronizer may just be going bad.
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Old 02-13-2014, 09:18 PM   #5
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Yes.... and that 2nd gear is always the gear that it happens to on the 3550. You can't tell me that the older transmissions grinded into reverse from the factory either.
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Old 02-13-2014, 11:22 PM   #6
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Yes.... and that 2nd gear is always the gear that it happens to on the 3550. You can't tell me that the older transmissions grinded into reverse from the factory either.
So you're telling me if I google 1st, 3rd, 4th, 5th, and reverse gear grinding in the NV3550 then nothing will show up?
I can and I will tell you that it was possible for reverse gear to grind from the factory. The AX-15 and AX-5 transmissions came from the factory with no synchronizers in reverse gear.
I'm unsure why you're saying yes. The two problems have no relation to each other and I've all ready explained why.
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Old 02-14-2014, 12:12 AM   #7
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common gears grinding for their respectful transmission.. seems like that is relation in itself.
Sure you could Google it. But you could also Google a monkey driving a jeep and I'm sure it would show up.. doesn't mean it's common. 2nd gear grinding is a well known common issue for the nv3550 specifically. More so than the other gears. Just as the reverse grind its common for the ax 15 specifically.
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Old 02-14-2014, 12:25 AM   #8
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common gears grinding for their respectful transmission.. seems like that is relation in itself. Sure you could Google it. But you could also Google a monkey driving a jeep and I'm sure it would show up.. doesn't mean it's common. 2nd gear grinding is a well known common issue for the nv3550 specifically. More so than the other gears. Just as the reverse grind its common for the ax 15 specifically.
If that's the way you justify correlations then I can just as easily say that as ice cream sales go up then death by drowning goes up. I'm sure it's ice cream that causes the drowning and not because it's summer time when ice cream sales go up... Continue to think whatever you want. You were just as stubborn last time I corrected you.
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Old 02-14-2014, 01:59 AM   #9
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lol because saying two transmission issues are similar in a certain regard is saying they cause each other? You may have learned your basic logic types but not how to place them.
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Old 02-14-2014, 02:00 AM   #10
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But I am not here to argue over technicalities in writing. I was only here to offer my opinion on his issue of which I also share
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Old 02-15-2014, 04:33 AM   #11
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Old 02-15-2014, 07:09 AM   #12
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Damn did this thread get hijacked...Hey dirty got a beer?....how about sharing a few kernals of that popcorn..
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Old 02-16-2014, 12:03 AM   #13
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Old 02-16-2014, 12:07 AM   #14
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Old 02-16-2014, 12:16 AM   #15
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Mine grinded some new. Bought a 2000 in 99. Within a few months it was smooth. 2nd btw. I do think it's indicative of the tranny. It still works fine 14 years later and that's all that matters.
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Old 02-16-2014, 03:54 AM   #16
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Agreed ax15 no syncro 1 or reverse

When syncros wear in my limited experience the 1 to 2 shift suffers more often than others

I was also a little surprised to experience an improvement with a used 300zx with about a thousand miles of gentle shifting

I did an auto to manual swap for a failing auto and the probably previously abusively shifted 5 SPd I got from the junkyard had an annoying 1 to 2 grind unless the shift was done at a very leisurely pace. Funny thing was after a few months of babying it, it actually got much better, not ever quite perfect but much improved

ImProved enough to do normal pace shifting without grind however expedited shifting would still produce a grind
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Old 02-16-2014, 09:07 AM   #17
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My NV3350 started feeling old, quirky and it buzzed-into second gear as well. I changed the fluid to RP. And it's been great ever since.
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Old 02-16-2014, 02:01 PM   #18
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That was the first thing I tried. Late last summer I drained it, cleaned the plug, and filled it up with RP. No difference
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Old 02-16-2014, 11:20 PM   #19
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Do you have a transfer case drop installed? Mine did the same thing & I tried the oil first with no success. Once I pulled my transfer case drop out, I had no more problems.
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Old 02-18-2014, 07:19 PM   #20
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Nope. No lift, no t-case drop. Its just a stock TJ with 31x10.5" tires
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Old 02-18-2014, 08:26 PM   #21
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Im not sure where to start looking. Is the gear worn? Thanks

second gear has a needle bearing in it. when it goes the shaft will get ate up. if you keep having to force it, it will go. best bet is to pull the trany, inspect the fingers on the pressure plate, then dig into thee trany if the clutch looks good.
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Old 02-19-2014, 12:09 AM   #22
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It wouldn't have anything to do with the clutch if it was only one gear. That wouldn't make sense. The clutch doesn't know what great the tranny is in
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Old 02-21-2014, 03:17 PM   #23
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It wouldn't have anything to do with the clutch if it was only one gear. That wouldn't make sense. The clutch doesn't know what great the tranny is in
In theory
But second gear seems to be the gear that is hardest to acquire. If the clutch is at that worn part when it isn't slipping enough, it's gonna act on that gear most.
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Old 02-21-2014, 09:49 PM   #24
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Quote:
Originally Posted by ratherbedirty View Post
Hey fellas. Got an '03 TJ, 4.0/5spd. Its my daily driver. Ive had it for about 4 years now, and ever since I bought it, its been going into 2nd gear a bit hard. Recently (especially with the cold weather) it started grinding when downshifting into 2nd. I figured the syncro was toast. But incase it might be the slave cylinder, I tried pumping the clutch a few times between gears, and it seemed to help most of the time, but not consistently. The other day when pulling into work, I noticed my 2nd gear was a bit noisy. Just out of curiosity, I tried starting from a stop in 2nd gear. As soon as I engaged the clutch, it popped right out of gear, making me think the gear is chewed up. But Ive tried that again since, and it stayed in gear just fine.

Im not sure where to start looking. Is the gear worn? Is the slave cylinder bad? Is it the syncro? Or is it just a bad bushing in the shifter? If anyone knows of any common problems that I should look at first, please let me know. Im at a loss, and I have to drive this thing every day, so I cant tear it all apart just yet. Thanks

Does it have a body lift, even a 1" lift?

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