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Unread 03-19-2012, 05:48 PM   #1
williambmac
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5 speed or 6 speed transmission

Anyone out there have an opion on the negatives of the tj/lj 6 speed trans.
have you had problems/failures and at what mileage.
Being that I have heard mixed opinions on this trans, mine makes noise and is very notchy @ 54k, I was considering swapping my basically brand new ax15 into my 05 rubi lj.

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Unread 03-19-2012, 06:21 PM   #2
ops5
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Have you tried changing out the fluid? Mine was a little notchy at 34K, I changed the fluid and it shifts fine now. I used Pennzoil Synchromesh. On the other hand, it gets cold where you are, so a synthetic might work better.
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Unread 03-19-2012, 06:59 PM   #3
williambmac
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I have tried Amsoils synchromesh and the Pennzoil. Neither has helped the notchy shifting, but my main concern is the trans whines pretty bad @ 60 mph.
the fluid was pretty clean when I dropped it.
I have read on several boards that the 6 speeds are pretty weak and prone to failure.
Thats why I was considering dropping in my almost new terminator
ax15.
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Unread 03-20-2012, 04:38 AM   #4
Dean7276
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The plastic pads on my shift fork assembly wore down and i had metal on metal grinding inside my trans at 60k miles. I'm not very happy dumping $1100 on a manual trans with so few miles. It's also made by Mercedes and all parts are imported from Germany = more money.
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Unread 03-20-2012, 05:45 AM   #5
unlimited4x4
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Dean 7276, the $1100 dollars, was that for the shift fork assembly and installation only? I'm asking cause I believe I have the same problem at 80,000 miles. I also need a new throw-out bearing and possibly pilot bearing. That's expensive and makes me a bit nervous.
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Unread 03-20-2012, 05:56 AM   #6
Dean7276
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Quote:
Originally Posted by unlimited4x4
Dean 7276, the $1100 dollars, was that for the shift fork assembly and installation only? I'm asking cause I believe I have the same problem at 80,000 miles. I also need a new throw-out bearing and possibly pilot bearing. That's expensive and makes me a bit nervous.
Yes, it was out the door. They also put in a new clutch/throw out bearing while it was down. I bought the clutch from Pep Boys for $125 and had the trans shop put it in. The shift fork assembly was around $500 for the part.
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Unread 03-21-2012, 12:21 AM   #7
ssjeff
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Novak says the 6 speed is a pretty good trans that will hold up to the stock gen 3 gm motors. They have good revues on the transmissions. My 06 rubi 6 speed has 64k on it and no problems yet.
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Unread 03-21-2012, 12:57 AM   #8
bojang
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Quote:
Originally Posted by ssjeff View Post
Novak says the 6 speed is a pretty good trans that will hold up to the stock gen 3 gm motors. They have good revues on the transmissions. My 06 rubi 6 speed has 64k on it and no problems yet.
The transmission itself might hold up fine. Doesn't do any good if you cant shift it because two little pieces of plastic wear out.
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Unread 03-21-2012, 05:51 AM   #9
Dean7276
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Quote:
Originally Posted by bojang

The transmission itself might hold up fine. Doesn't do any good if you cant shift it because two little pieces of plastic wear out.
It's amazing how a few pieces of plastic 1/2" square and 1/4" thick can disable a transmission.
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Unread 03-21-2012, 07:38 AM   #10
Fingers302
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I have the 6 speed and at 39,000 miles it has not given me any trouble. However, I see no advantage over the 5 speed. I almost always skip 5th gear. The ratio is too close IMO.
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Unread 03-21-2012, 08:37 AM   #11
gnod
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Quote:
Originally Posted by Dean7276 View Post
It's amazing how a few pieces of plastic 1/2" square and 1/4" thick can disable a transmission.
can you please clarify that you're referring to? i have no idea what that is.. haha

i have the 6 speed also at 38k miles 2005 LJ... this is my firs manual car.
I don't notice any crankings, or metal on metal sounds in mine.
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Unread 03-21-2012, 09:05 AM   #12
RaggedOleMan
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I have the 6spd with 180k on it.
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Unread 03-21-2012, 09:10 AM   #13
ssquier92
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They are all about the same. I would not do the swap.. they say the 6 speed is better for DD.. its a little weaker then the ax15.. not by much at all though.. The strongest tranny our TJ's came with is the nv3550.. But you want to talk about notchy shifting? Its a truck tranny and certainly behaves like one.. and I had to replace it at 125k. From my experience the 6 speed seems like the best driving tranny while the other two are just barely stronger, but certainly cheaper to replace
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Unread 03-21-2012, 06:46 PM   #14
TJJP77
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I own both and prefer the 5-speed. I used to own a truck with an NP-435, so the 3550 feels fine to me. I also prefer the gear ratios of the 3550 - they seem to compliment the power curve of the 4.0L a little better. While I'm somewhat jealous of the lower 1st gear of the 6-speed, if you run a stock 6-speed rig, first gear is almost too low for street starts and 2nd is just a touch too high. With a lift and bigger tires, this issue with the 6-speed goes away.

My 5-speed has never given me any trouble. My 6-speed on the other hand tends to jam in high gear after driving on the highway for extended periods - not sure what the problem is exactly...could be the clutch hydraulics, could be the clutch itself or it could be in the transmission. I changed the fluid last fall and haven't driven it on a long trip yet, so I'm about to find out if the new fluid helped or not. Overall the 6-speed is notchier in my opinion and can be harder to get into gear on occasion. Never had that experience with my trusty old 5-speed.
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Unread 03-22-2012, 02:00 AM   #15
bojang
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Quote:
Originally Posted by gnod View Post
can you please clarify that you're referring to? i have no idea what that is.. haha

i have the 6 speed also at 38k miles 2005 LJ... this is my firs manual car.
I don't notice any crankings, or metal on metal sounds in mine.
Inside the transmission, there are "shift forks", these forks move the gears inside the transmission, for and aft, or too and fro, perhaps hither and dither, or even this way and that.... On the ends of these forks, are two little pieces of plastic, meant to be used as bushings, they wear, so they are thinner than they are supposed to be, or even broken, which they are not supposed to be at all. The shift forks then do not move the gears as far too nor as far fro as they should to ensure proper engagement, resulting in you having embarrassing episodes of gear grinding at the most inopportune times.
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