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Old 09-22-2009, 10:39 AM   #1
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having problems with tranny install.

I recently had the tranny on my 99 sahara 4.0 go south on me. The 5 speed is stuck in fourth gear and then it got stuck in neutral. I pulled the tranny out and im in the process of rebuilding it now. The problem I am having is that I cant find the right pilot bearing. I have been to the jeep dealership and the pilot bearing they give me is way too big for the input shaft. I have been to all the local auto part stores and they are all too big. I even tried ones from a 98 jeep and a 2000 jeep with no luck. Does anyone know why my input shaft is so small?

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Old 09-24-2009, 01:13 PM   #2
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does anyone know what the diameter of the input shaft is on a 99 ax15? I was thinking maybe someone swapped the tranny with one from maybe a cherokee or older wrangler.

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Old 09-24-2009, 01:31 PM   #3
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The input shaft is pretty small where the bearing fits, it has to be that you're getting the wrong bearing. Did you pull just the old bearing or the old bearing and the bushing that holds it in the flywheel? The hole in the flywheel is pretty big which is filled by the bushing, and the bearing is then seated into that. The OD of the bearing is pretty close to 1" or maybe 1.25" IIRC, it's not all that big but it's been a couple years since I saw mine.

Here's a pic of mine that may help if you print it out to show to the parts people...
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Old 10-06-2009, 10:08 PM   #4
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Ok I have fuigured out what the deal is.. I have an ax15 from an older yj. The tranny is rebuilt and ready to go in, the problem is that the input shaft is too small for the tj pilot bushing, and if I try to use a older yj pilot bearing the o.d. does not mach the hole in my flywheel. Jerry is correct, I need the o.d of 1" like the factory tj bearing and the i.d needs to be the same as an older yj. Does anyone know where I can find this bearing? my jeep has been down for a month and I really want to get it back on the road. Thanks
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Old 10-06-2009, 11:24 PM   #5
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stupid question but was there a part number on the one you pulled out?sounds like you have a hunt on your hands. i would take some measurements and call up a clutch company like luk and see what they have.
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Old 10-07-2009, 12:27 AM   #6
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I pulled the trans out months ago when I first bought the jeep because of a noise that i thought was the throw out bearing. The noise was actually a really mangled pilot bearing. I went through the whole mess of trying to find the right bearing and eventually had a machinist make me a solid bushing out of brass. That brass bushing I had made is what I am trying to replace because it is also messed up after a few thousand miles because my input shaft was chewed up. Now that my trans is rebuilt I got a new input shaft and want to find a needle bearing instead of having a solid brass bushing made again. I actually still have the mangled pilot bearing that was in the jeep when I bought it but cant make any numbers out.
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Old 10-07-2009, 12:29 AM   #7
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I have been searching napa online because they tell you the i.d and o.d of their pilot bushings but have not been having much luck.

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