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Discussion Starter · #1 ·
I've got a 2005 TJ I picked up a few weeks ago. Only 60k miles on it. It seems to have a little crunch shifting from 1st to 2nd sometimes. Crunch, not a grind. Does this seem normal or maybe I've got bigger problems?
 

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depends on what you mean by crunch?

I think there are quite a few of us out here that have issues going from 1st to 2nd when cold. Seems there could be several factors, lift, trans oil, linkage etc.

I would probably put some sort of synthetic trans oil in there and see how she does after that.

I personally had this issue with a 2000 TJ and decided to pull and completely rebuild the trans replacing syncros as well and filled with redline synthetic fluid. Still doesn't like shifting from 1st to 2nd. I think its just a Jeep thing.
 

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Discussion Starter · #3 · (Edited)
Sticky Syncros

I just have a little crunch maybe every third time I shift. I let the revs fall and just ease it into 2nd. 2 out of 3 times it's smooth. I just had the trans drained and refilled with new oil thats supposed to free up sticky syncros. I've put about 120 miles on since then. Can't say that it feels much different. At this point, I hope it is just a jeep thing.
 

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There was just a thread about this the other day, too. Mine does the same thing cold, no matter what the fluid.

After you shift from first and into neutral on your way to second, bring the stick right a bit, then back left, then down into second and it'll go nice and smoooooth.
 

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My ax15 shifted good but the nv3550 has the problem you describe and it's brand new.
 

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mine always grinds whenever u throw it in reverse with the clutch pressed all the way to the floor. I shift it into 5th or somethin and it usually goes smoother... don't know why I posted this haha
 

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I just bought my '05 with 33k on her from Carmax about a month back, I brought her back yesterday because it would pop out of first when cold, they drained an refilled with synthetic now she is a bit resistant to go into gear right at startup (been 15-20 degrees here) but shifts fine when warmed up and no longer pops out of first.
 

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^ '05 they started using the NSG370 6 speed, and they do have a problem with popping out of gear. Check the JK section, the transmission is used in them and there's quite a bit of discussion about it. There may be a recall, check with a dealer.
 

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I have been driving for over 40 years and have driven everything up to big rigs. After many years in a wrangler you need to shift slowly to prevent grinding. These are not sport cars that like fast shifting. They are more like trucks, beefer than sports cars, and need tender loving care. Have almost 100K on my TJ and whenever I shift a little too quickly it grinds a little. It's just the way they are built. Think double clutch when shifting but you do not need to double clutch.
 

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I have 2, one at 67,000 miles and one at 93000 we just picked up, both are crunchy going into third.

I changed the fluid in the 67k mile one to synchromax last week and it hasn't really improved. They both didn't have this problem before, not sure why it start to show up now.
 

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I have a 01 Sport and recently I can feel the gears meshing when I shift from 1st to 2nd not all ways but once in a while. No grinding but I can feel it in the shifter.
 

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My '05 had that same crunch until I tried M1 10w30 synthetic engine oil in both transmission and TC based in a recommendation from Rockland Standard Gear. Their techs are top-drawer and an authority that I greatly respect for excellent advice on these matters.

Problem solved.

Prior to that I tried a half-dozen expensive aftermarket MT lubricants that never really got rid of the problem. Love the way it shifts now; in fact, it's so smooth and quiet that it is borderline-fun again, even when it's below zero in the morning around here.
 
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