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Old 08-28-2010, 11:12 AM   #1
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Transmission Question

I have a 4.0l engine with a 5spd standard transmission that grinds when I shift from first to second while driving. Once it's in second it drives fine and when I'm stopped and put it from first into second there's no grinding. I need some help here I got the jeep 3 days ago so I don't know much about them. I do have the factory service manual and I've rebuilt several dirtbike engines so I have a fair bit of mechanical knowledge.

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Old 08-28-2010, 11:18 AM   #2
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That sounds like nothing worse than a bad second-tear synchronizer. Try slowing down on your shift to 2nd gear to help it shift. The synchronizer itself is inexpensive but the labor to remove the transmission and replace the synchronizer is not cheap.

You don't say what year TJ you have but changing out the gear lube inside the transmission to something like Redline MT-90 might help a bit.

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Old 08-28-2010, 11:21 AM   #3
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I have a 2000 sport model. I think I'll start by changing the fluid and see how it goes from there.

Edit: Is there any way to fix the synchronizer without removing the transmission?

Edit #2: How can I tell which transmission I have?
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Old 08-28-2010, 04:51 PM   #4
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Old 08-28-2010, 05:05 PM   #5
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#1 The transmission has to be taken apart to replace the synchronizer so it has to be removed from the Jeep.
#2 You have the NV-3550 transmission.
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Old 08-28-2010, 05:13 PM   #6
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Thanks for the help. How hard is it to replace the synchronizer once the transmission is removed and is it bad to keep driving it?
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Old 08-28-2010, 05:17 PM   #7
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Having a bad synchronizer just means it will grind going into the gear that has the bad synchronizer. Just slow down on your shift into 2nd gear and it should be fine. If you don't know how to work on transmissions, replacing a synchronizer isn't something I would even consider.
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Old 08-28-2010, 05:33 PM   #8
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If you double clutch you should reduce/eliminate the grind when your syncros are worn. Worn syncros are usually caused be someone shifitng too fast and forcing the syncros to wear.
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Old 08-28-2010, 07:17 PM   #9
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How do I "double clutch"? I used to shift fairly fast but now I shift slow between every gear after this happening.

How hard would it be to swap an AX15 transmission into my jeep?
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Old 08-28-2010, 07:56 PM   #10
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Double clutch:Pedal in and out to take it out of gear,into nuetral..repeat step one to get into 2nd gear...

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