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Old 01-21-2010, 12:14 PM   #1
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TJ 5 spd. trans. issue

My 97 TJ With 90,000 + mi. when cold hard to shift to 2nd gear? After driving & warm temp. glitch gets better. I installed Hurst shifter & changed gear oil to synth. lighter wt. W/ very little change.
Any suggestions.

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Old 01-21-2010, 01:38 PM   #2
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same here...except I went with Pennzoil syncromesh and it got worse.

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Old 01-21-2010, 02:07 PM   #3
IITYWTMWYBMAB

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Try another fluid change with Jeep fluid. How did the fluid you took out look? Still pink? Any metal shavings etc.?
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Old 01-21-2010, 02:29 PM   #4
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i have the same problem. when i got the jeep used it had no problems.2 winters and not a problem until i changed all the fluids. I put in the recommended gear oil and wieght in and now when its cold it doesnt wana go into 2nd very easily. i havent figured out the solution yet but i have noticed if i let the jeep warm up for a little before driving,it is ok,and if i drive it right after i start it i will just skip second gear until it warms up enough,then it works fine.has anyone changed it with mopar gear oil and had the same problem?
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Old 01-21-2010, 02:37 PM   #5
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I've been told on more than 3 occasions that Mopars oil is made by Pennzoil. I wasn't willing to spend the $ on the same oil twice...someone else wanna be the guinea pig?

I'm about 90% convinced mine just needs a new 2nd syncro.


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Old 01-21-2010, 02:50 PM   #6
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Hard shifting like that is not uncommon for the AX-15 and is often the sign that a synchro is going out.

However, it is fussy about the gear lube you install into it. You can't fill it with just any tranny gear lube and most of the time you can't use GL-5 which is the most commonly found gear lube. Its actual specification is a GL-3 75W-90 gear lube but the newer GL-4 spec 75W-90 like Redline's MT-90 is ideal. GL-4 is an upgrade to GL-3 and it works fine in that transmission.

The confusing thing is where GL-5 (really meant for axles) forms of 75W-90 are concerned. Generally speaking, GL-5 gear lubes should not be used and 99% of the gear lubes you find on the store shelves are GL-5. Most GL-5 gear lubes are harsh on the synchronizers used in the AX-15 (and AX-5 for you 2.5L four-banger owners).

However, there are SOME GL-5 lubes that are ok and those include the synthetic 75W-90 gear lubes like from Royal Purple and Amsoil. They have a different formulation of GL-5 that is not harsh on the synchronizers.

My personal choice for the AX-15 and AX-5 is Redline's MT-90. It is a fully synthetic GL-4 75W-90 and those transmissions really like it. It's not a miracle gear lube and it won't fix damaged transmissions but it can often fix tough shifting issues caused by old or incorrect gear lube.

One last comment... only ATF for automatic transmissions is pink, the correct gear lube used in the AX-15 is decidedly not pink.
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Old 01-21-2010, 07:45 PM   #7
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My '99 has a pretty bad shift in first, second and starting to be in third. I'm thinking the synchros themselves may be beyond saving. Dare I even ask how hard it is to replace them? I understand it's about $6 a synchro (not sure if any of the gears in it are double-synchro systems) but I'm taking a guess the labor is about 50% of the TJ's value...

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