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Unread 12-11-2007, 10:42 AM   #1
lilngineer
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99 Manual Transmission Help

Hi,

I have a 99 TJ with the 2.5L and 5-speed manual trans. I have noticed that it is randomly difficult to shift into first and reverse gears. All the others are OK.

Also, I have noticed that when it is in reverse, I get a lot of gear whine (fairly loud).

Are these conditions normal or should I suspect some problems?


Thanks,

Jason

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Unread 12-11-2007, 10:50 AM   #2
ryobi
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I have precisely the same symptoms in my 98 TJ. I, too, await opinions.
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Unread 12-11-2007, 11:11 AM   #3
TheBoogieman
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Sounds like the gear synchro's (synchronizers)are getting bad to me.Mine has done that for 2 years and hasn't got any worse.You can try some Royal Purple Synchromax or Redline MT-90.It helped mine somewhat.
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Unread 12-11-2007, 11:30 AM   #4
ryobi
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Which fluid is appropriate for a 98 TJ with 5 speed/4.0 engine?
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Unread 12-11-2007, 12:29 PM   #5
TheBoogieman
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Quote:
Originally Posted by ryobi
Which fluid is appropriate for a 98 TJ with 5 speed/4.0 engine?
75/90W gear lube.I switched to the synthetic Redline MT-90.
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Unread 12-11-2007, 03:02 PM   #6
daveg13
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Quote:
Originally Posted by ryobi
Which fluid is appropriate for a 98 TJ with 5 speed/4.0 engine?
A GL4 gear lube. One of the few available is Redline MT-90 or MTL.
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Unread 12-11-2007, 03:04 PM   #7
creaky70
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My '99 TJ has done the same thing from day one. Never got better or worse.
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Unread 12-11-2007, 03:05 PM   #8
Jackle
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the reverse whine is normal for all manual transmission vehicles....this is because all forward gears are helical cut gears and reverse is a straight cut gear...don't worry about the whine...its fine
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Unread 12-11-2007, 03:49 PM   #9
marc1kim
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Quote:
Originally Posted by daveg13
A GL4 gear lube. One of the few available is Redline MT-90 or MTL.
Ax-5/ax-15 Use the above GL-4.

Pennzoil Synchromesh, or Royal Purple Synchromax is for the newer Jeeps with NV transmissions. Stay away from GL-5 or equivalent gear oils, they aren't freindly with internal brass parts.

One thing to note, Chrysler has superceded their AX-5/AX-15 fluid with Chrysler 10W30 motor oil. Which is pretty much the same viscosity as the GL-3 oil that was originally recommended by Jeep.

and. The Trans Lube chart on the Royal Purple website recommend 10W40 for all 98 and newer manual Jeep transmissions (except for the NV series)
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