98 Manual Shifts smooth but grinds in gear - Jeep Wrangler Forum
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Old 04-29-2013, 12:57 PM   #1
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98 Manual Shifts smooth but grinds in gear

I've seen a ton of posts about manuals grinding when shifting between gears, but I get the grinding after its in gear. I flushed the transmission fluid, which apperently has never been done till now at 160K miles, but no real change.

4th is the only gear that runs smoothly. R,1-3 and 5 grind very loudly, but I am not losing any power and it is not slipping. I am assuming it's the transmission that is bad, but this is my first Jeep and I'm not a big mechanic (just know how to do brakes, rotors, fluids and other minor maintenance stuff). I've driven other manuals but never had a manual transmission go on me, so I don't know if this is it....

Its a 98 Wrangler 4cyl. Should I start looking for used/rebuilt transmissions?

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Old 04-29-2013, 01:05 PM   #2
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It sounds like the synchros (gear synchronizers) have just gone bad, time for a rebuild or rebuilt transmission. Your transmission is an Aisin AX-5 which is the model transmission used behind the 2.5L engine.

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Old 09-05-2013, 08:56 PM   #3
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If you don't have your answer yet, this sounds to me like countershaft bearings are shot. Could run for years like this or a few days. I had a v8 Dakota that I drove like this for months until I decided to replace the trans. The reason 4th gear is smooth and quiet is because it is direct drive and doesn't have the pressure on the countershaft.
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