Jeep Wrangler Forum

Jeep Wrangler Forum (
-   TJ Tech Forum (
-   -   Bearing Noise (

cabenso 03-05-2014 03:09 PM

Bearing Noise
Ok, so a little background:
I just put in a 5.3L Chevy motor, replaced my frame, both axles (front D30 rear Ford 8.8), put in a AX15 and rebuilt my old NP231 to go to AX15. Novak products are sprinkled everywhere in between. The parts list goes on forever.

The good:
It sounds and drives like a monster truck.

The bad:
I am honestly learning as I go here. I bought the transmission rebuilt from ebay (shame on me). The guy didn't put the bearing retainer on and I didn't notice after the Novak Adapter was on the transmission (again, shame on me). So last week I lost 4th gear when the input shaft pulled out. Immediately drove jeep home, pulled the tranny, and had a guy replace input shaft and anything else that looked chewed.
He had all the parts I needed in his shop. I wouldn't be surprised if they were used. Now that tranny is back in, Im getting a horrendous grinding noise coming from the tranny. It gets louder with speed and doesn't matter if the clutch is in or out. I can shift into all the gears, except reverse can be tricky sometimes. I'm assuming that rules out the throw-out bearing.
Could I have a bad pilot bushing or input bearing?

I know I can hear this noise from the transmission area. But for some reason, I feel like it also gets worse when I make sharp turns. Could it be a bad wheel bearing that just sounds like its from the tranny? Could it be both a wheel bearing and tranny?

Sorry for the essay. Since I replaced nearly everything, I don't know what to compare it to.


cabenso 03-05-2014 04:28 PM

I'm sure this could start a whole new argument. But for what its worth, I put 75W-90 GL-4 Synthetic into the trans. It didn't make this noise before the input shaft/bearing was replaced. Although I could have done a bad job re'installing it and maybe it's the pilot bushing. Any thoughts, please let me know. I spent months building this and just want to enjoy it at this point.

cabenso 03-05-2014 08:32 PM

Bump, Help!

itscakes 03-05-2014 10:18 PM

Manual or auto?

itscakes 03-05-2014 10:22 PM

Sry should've re read . Was flywheel ever inspected or taken out? If so could the bolts not be properly torqued? Or flywheel not sitting right? Possibly bad clutch plate? Doesn't sound like a throw out bearing since you get it all the time.

cabenso 03-05-2014 10:48 PM

The flywheel, pressure plate, clutch, pilot bushing, throw out bearing, and tranny adapter were all 1 package from Novak Conversions. I trust that they are the right parts. I'm sure I set the flywheel to the correct torque. Since clutch is brand new (10 miles on it) I dont think thats it. It's not throw out bearing for the reason you stated. Thats why I'm led to believe its the pilot bushing or input bearing.

Say Im going down a hill, in neutral, with the clutch disengaged (pedal in). Would the input shaft spin? Because the sound is there even in that scenario.

Could I have done something wrong while putting the trans back into the Jeep to cause this noise?

C.L. 03-05-2014 10:52 PM

Put your transfer case in neutral and rev it through the gears. If no noise, you know the issue is with carrier/axle bearings.

cabenso 03-05-2014 10:54 PM

You're the man C.L. I'll do that tomorrow.

cabenso 03-08-2014 05:00 PM

Alright, well its not the carrier or axle bearings. So its either something with the transmission or transfer case. It also sometimes sounds like gears are slightly rubbing together in the transmission when driving in gear or coasting.

Any thoughts?

cabenso 03-09-2014 11:34 AM

would more information help?

I just spent 6 months doing drive-train build. At this point I just wanna figure out this problem and start driving it!

cabenso 03-09-2014 06:52 PM

Chime in please if you have any advice. But after looking around, I noticed that my throwout bearing is pressed against the pressure plate all the time. I feel like that shouldn't be the case. But I'm not sure how to get it (throwout bearing) to disengage. I just ordered a cheap borescope yesterday and I'll try to drive with it taped to the clutch fork so I can see whats going on.

cabenso 03-23-2014 11:30 AM

Bump, please help

cabenso 03-26-2014 07:19 PM

Bump, please I'm begging. Has anyone ever had experience with throwout bearing or pilot bushing noise?

cabenso 04-11-2014 02:43 PM

The noise is still there. I was under the Jeep today while it was at idle and I could see the pressure-plate/clutch wobbling. There was also a ticking noise coming from it as well. could the input shaft of the tranny not be perfectly level with the engine?

Please I am begging for some help here. Now that I've done the engine swap I want to enjoy driving the Jeep.

cabenso 04-12-2014 06:52 PM


Do I need to give more information or clarify anything?

jeepwayoflife 04-13-2014 10:59 AM

Have you talked to the guy that repaired the tranny? It sounded fine before you brought it to him and now its making a loud grinding noise...

All times are GMT -5. The time now is 07:52 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.