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Old 10-17-2013, 05:50 PM   #1
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2nd Gear shift grinding

Howdy folks, first post on this forum. Have an issue though with my Jeep; for the last 4-5 months (it's gonna sound horrible), when I shift into 2nd gear in my Jeep it has a tendency to grind. When I replaced transmission fluid it eased up but it came back again. So wonder what parts/labor I need to do to try to remedy this. Thanks guys.

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Old 10-17-2013, 06:03 PM   #2
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You've got a nv3550 because you've got a 2000. What gear oil did you put in it?

You could go in and replace your 2nd gear syncro.

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Old 10-17-2013, 06:16 PM   #3
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You've got a nv3550 because you've got a 2000. What gear oil did you put in it?

You could go in and replace your 2nd gear syncro.
I wanna say I got Pennzoil Synchromesh when I did it. And do you have a recommended place where I can buy transmission parts such as the 2nd gear synchro?
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Old 10-17-2013, 06:19 PM   #4
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And one more thing, how do I get the little description section below my posts so it's easier to pick out my Jeep info in my posts? Like I said, very new here.
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Old 10-17-2013, 06:45 PM   #5
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Don't shift it like a sports car. shift slowly. It's more like a truck than a car.
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Old 10-17-2013, 07:49 PM   #6
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Oddly enough I was experiencing the same thing in my 2000 Sport. Until last weekend. Along with the shifiting I had a throw out bearing noise. Well I went to Autozone and picked up a clutch pack and replaced my clutch and throw out bearing. When I looked inside the bell housing I noticed that the wire clip that holds the bearing support fork on the ball support was missing. Well it was Sunday and no factory parts to be found, so I used some stainless wire I had to tie the fork end to the ball. The other end rests on the Slave piston. Well after putting everything back together and test driving, I was pleasantly surprised to find no more grinding into second. I don't know what corrected the grinding but I am very happy that my trans is shifting much better......
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Old 10-18-2013, 07:47 AM   #7
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Mine used to grind and it progressively got worse until it wouldn't even go into 2nd. I had the clutch and syncro done and it fixed it. It still doesn't shift smooth as butter and it is "crunchier" to shift when it is cold, but I guess that's just the nature of the beast.
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Old 10-18-2013, 12:13 PM   #8
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Originally Posted by 1Felix1 View Post
Oddly enough I was experiencing the same thing in my 2000 Sport. Until last weekend. Along with the shifiting I had a throw out bearing noise. Well I went to Autozone and picked up a clutch pack and replaced my clutch and throw out bearing. When I looked inside the bell housing I noticed that the wire clip that holds the bearing support fork on the ball support was missing. Well it was Sunday and no factory parts to be found, so I used some stainless wire I had to tie the fork end to the ball. The other end rests on the Slave piston. Well after putting everything back together and test driving, I was pleasantly surprised to find no more grinding into second. I don't know what corrected the grinding but I am very happy that my trans is shifting much better......
Well I'll take that into consideration, granted I'm very inexperienced in doing transmission work. But thanks for the help. And recently had the clutch replaced; it helped a little initially but it started grinding again, mainly when I'm >15mph downshifting into 2nd. And how much you think syncro work would cost and should I give a crack at it doing it myself?
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Old 10-18-2013, 09:25 PM   #9
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change tranny fluid???

My 3550 has always shifted great with just a slight amount of back pressure needed to go into gear--very very little needed.When I changed it the first time I also used Penn Synchrome that does have the Chrysler code # on the bottle.Within a month or so I started noticing a slight grind upon shifting that got progressively a little worse but still shifted within a happy medium.After reading in the forum about tranny fluids I changed it and used Redline Synchro fluid.I flushed it out with kerosene first.I started shifting perfectly the very first time I left the driveway.Check behind me but I think the three best to use are (1)Redline Synchro (2) Amsoil Synchromesh (3) Royal Purple Synchromax.The Chrysler product and the Penn product don't work well with the synchronisers.
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Old 10-21-2013, 06:11 PM   #10
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Thanks for the help guys. Gonna try Royal Purple this time and see how it works out. If not, I'll figure out how to crack open the transmission and see what part of 2nd gear or the synchro needs work.
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Old 05-16-2015, 07:52 AM   #11
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I bought an 05 tj with 145,000 miles, and shortly after I bought it, it started doing a slight grind before shifting into gear. It also started catching before shifting into 3rd. It stopped doing it all together after everything warmed up. I took it back to the dealership and at first they couldn't "duplicate the problem". Seems to be the normal response. I told them I feared the 2nd and 3rd gear syncroniser was going bad. They finally decided to open the tranny up and they found both syncros were shot. if you press in the shifter all the way and shift, it shouldn't grind at all. Sometimes the tranny Is picky and likes to be difficult shifting into second gear especially when cold, but no grinding should happen at all
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Old 05-16-2015, 12:09 PM   #12
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Sorry to hijack the thread but I thought you needed a special jig to work on the 3550 because of the way the case is built. So wouldn't you need that to change the syncro's? I ask because I have a mild clunk going into 3rd.

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Old 05-16-2015, 06:16 PM   #13
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I too have this problem shifting into 2nd. I have a 1998 pretty high mileage vehicle. It seems to be worst when the trans is cold for sure or first starting. It wants to have a very slight grind going onto 2. All the other gears are fine. Once it warms up and I baby the shifts it rarely happens but does feel like its having a little trouble engaging or like there I not enough throw on the shifter to fully engage. I was wondering if it was a shifter adjustment. Not sure how changing trans fluids could make a significant difference but am going to give it a try. Ironically I was just going to post on the same issue when saw this thread.
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Old 05-16-2015, 06:39 PM   #14
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98 4.0 5 speed is an ax-15

2000-2004 4.0 5 SPd is a NV3550

05 06 4.0 6 speed is a German POS

Different tranny do best with different fluids
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Old 06-12-2015, 08:20 AM   #15
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i put royal purple in mine, and noticed shifting got a lot better, but if I shift in low RPMs into 2nd, it doesn't like it at all. If I shift normal, it's not a problem. This is the second tranny I've had in my jeep. Original tranny went in for grinding issues and they found syncros were bad. had 146000 and the dealership claim they couldn't get parts for weeks so they found a used one in with only 50,000 miles, and this one doesn't like shifting low either. Only does it when it's warming up. Also, pensoil synchromesh I've heard has ingredients in it that eat brass, and that's what your synchronizers are made of!!!!! I was told to stay away from it
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Old 06-12-2015, 08:41 AM   #16
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Quote:
Originally Posted by maddog8805 View Post
i put royal purple in mine, and noticed shifting got a lot better, but if I shift in low RPMs into 2nd, it doesn't like it at all. If I shift normal, it's not a problem. This is the second tranny I've had in my jeep. Original tranny went in for grinding issues and they found syncros were bad. had 146000 and the dealership claim they couldn't get parts for weeks so they found a used one in with only 50,000 miles, and this one doesn't like shifting low either. Only does it when it's warming up. Also, pensoil synchromesh I've heard has ingredients in it that eat brass, and that's what your synchronizers are made of!!!!! I was told to stay away from it
This is not a big problem in warm weather or when the trans is warm but sucks in cold weather when I'm just getting going. Have not tried changing the fluid yet but surprised that it could make that much difference
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Old 06-12-2015, 02:40 PM   #17
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My NSG370 use to grind going into second all the time when I first bought it. Changed over to royal purple and slowed down my shifting, problem solved!
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Old 06-12-2015, 07:29 PM   #18
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Quote:
Originally Posted by maddog8805 View Post
i put royal purple in mine, and noticed shifting got a lot better, but if I shift in low RPMs into 2nd, it doesn't like it at all. If I shift normal, it's not a problem. This is the second tranny I've had in my jeep. Original tranny went in for grinding issues and they found syncros were bad. had 146000 and the dealership claim they couldn't get parts for weeks so they found a used one in with only 50,000 miles, and this one doesn't like shifting low either. Only does it when it's warming up. Also, pensoil synchromesh I've heard has ingredients in it that eat brass, and that's what your synchronizers are made of!!!!! I was told to stay away from it
The NSG370 is also notorious for having a bad shift fork and bends very easily in 2005. You basically have to replace the whole shifting assembly which sucks but pretty much fixes the problem "permanently". Changing the gear oil should help for a while but if you were experiencing grinding issues, expect them to come back.

Side Note: An older Jeeper who swapped an NSG370 into his early 2000s TJ I meet consistently with each month for Jeeps and Coffee told me something very interesting about the transmission and what you should put in it. He has already had to rebuild his NSG370 for the sake that he submerged it (his engine too) and when he got it rebuilt by his longtime friend mechanic he saw something very interesting in his new warranty info. If I recall correctly he mentioned that he had a quart of motor oil in his transmission. WTF right. He said he didn't believe it but his mechanic said if he ever brings his transmission in for work and he finds that the quart of motor oil is none existent, his warranty is voided. He said he doesn't what else is consisted as far as oil goes in his transmission but plans to check his warranty info that has it written out and get back to me. I know it sounds crazy and I'm still doubtful of it but this guy is like the "Jerry of the Houston area" and is well respected in the Houston Jeep community. I'll let you know next month what kind of cocktail he is truly running in his NSG370.
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Old 06-12-2015, 07:42 PM   #19
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My AX-15 shifts stiffly into 2nd until it warms up, never grinds though, never any issues with 3rd, 4th, 5th or reverse. It never likes to down shift into 2nd when I turn onto a street from the highway, I just use 3rd instead. I use Valvoline 75w-90 gear oil, shifts smooth once it's warm. These are definitely not car transmissions, they take some finesse.

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