What are the symptoms of a bad or loose pilot bearing? - Chevelle Tech
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post #1 of 11 (permalink) Old Jun 14th, 06, 10:02 PM Thread Starter
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Ron
 
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What are the symptoms of a bad or loose pilot bearing?

I have a clunck when I let off the gas at low speeds. If I tap the gas lightly it cluncks again. I'm pretty sure its coming from the trans, could a loose or bad pilot bearing cause this? It's with my Tremec 5 speed.
Thanks
Ron

70 Chevelle SS396 (496) Straub roller, M21
69 Malibu convertible
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Last edited by ToocoolZ28; Jun 14th, 06 at 11:36 PM.
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post #2 of 11 (permalink) Old Jun 14th, 06, 11:00 PM
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Jim
 
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Re: What are the symptoms of a bad or loose pilot bearing?

Ron
Check the U joints and suspension parts first. A bad pilot bearing won't clunk but will cause other problems like vibrations and hard shifting.
Jim
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post #3 of 11 (permalink) Old Jun 14th, 06, 11:35 PM Thread Starter
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Ron
 
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Re: What are the symptoms of a bad or loose pilot bearing?

Quote:
Originally Posted by GMJim
Ron
Check the U joints and suspension parts first. A bad pilot bearing won't clunk but will cause other problems like vibrations and hard shifting.
Jim
New U-joints, all new suspension, ALL new clutch and every piece of linkage, driveshaft is not hitting the floor. I'm stumped.

70 Chevelle SS396 (496) Straub roller, M21
69 Malibu convertible
95 Z28 Convertible T56 6 speed
TC #54 Gold

69 - Top down
69 Top up
new wheels
70 side
On Gearz
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post #4 of 11 (permalink) Old Jun 15th, 06, 7:58 AM
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Re: What are the symptoms of a bad or loose pilot bearing?

a friend has a 66 chevelle w/TKO600.
same clunk situation.
we found the spider gears had excessive wear.(open rear).
replaced the gears and all is good now.

david
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post #5 of 11 (permalink) Old Jun 15th, 06, 9:24 AM
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Re: What are the symptoms of a bad or loose pilot bearing?

Quote:
Originally Posted by ToocoolZ28
I have a clunck when I let off the gas at low speeds. If I tap the gas lightly it cluncks again. I'm pretty sure its coming from the trans, could a loose or bad pilot bearing cause this? It's with my Tremec 5 speed.
Thanks
Ron
How much backlash is there in the rear????

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post #6 of 11 (permalink) Old Jun 15th, 06, 1:58 PM
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Re: What are the symptoms of a bad or loose pilot bearing?

Get Under The Car With It In Park And Try To Move The Drive Shaft. It Sounds Like U-joints Or Rear End Gears.
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post #7 of 11 (permalink) Old Jun 15th, 06, 2:10 PM
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Re: What are the symptoms of a bad or loose pilot bearing?

The symptom of a bad pilot bushing is clutch chatter. Once the clutch is engaged, the pilot bushing cannot be responsible for clunking sounds. The u-joints or worn rear end gears are the most likely candidates.
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post #8 of 11 (permalink) Old Jun 15th, 06, 3:54 PM
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Re: What are the symptoms of a bad or loose pilot bearing?

Quote:
Originally Posted by Tkimble01
Get Under The Car With It In Park And Try To Move The Drive Shaft. It Sounds Like U-joints Or Rear End Gears.
we're new to the TKO transmissions.
where is "PARK" on the shift pattern.
we've been looking ever since this was posted.


david
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post #9 of 11 (permalink) Old Jun 15th, 06, 7:02 PM Thread Starter
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Ron
 
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Re: What are the symptoms of a bad or loose pilot bearing?

Nope, its definetly in the transmission, no doubt about it.
Thanks anyway.
Ron

70 Chevelle SS396 (496) Straub roller, M21
69 Malibu convertible
95 Z28 Convertible T56 6 speed
TC #54 Gold

69 - Top down
69 Top up
new wheels
70 side
On Gearz
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post #10 of 11 (permalink) Old Jun 16th, 06, 12:53 AM
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Re: What are the symptoms of a bad or loose pilot bearing?

Quote:
Originally Posted by 6t7gto
we're new to the TKO transmissions.
where is "PARK" on the shift pattern.
we've been looking ever since this was posted.


david



hahahahahahahahaha! Good catch!

I believe its kept under lock and key in the glove box. Something about "TOP SECRET"
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post #11 of 11 (permalink) Old Jan 21st, 09, 3:13 PM
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Re: What are the symptoms of a bad or loose pilot bearing?

Sorry, I dont mean to bring up such an old topic, but I have the same situation. Tremmic T5 . I have been having a clunk from the mid to rear of the car (behind seat) whenever I put the clutch in to shift. It becomes less noticable with each increasing gear. I had a stock rear in, and it was quite noticable, then I swapped in an entirely different axle with a shorter gear and it was not as noticable but still presant. The clunk has persisted through shock+bushing replacement, new springs, a new yoke, new u-joints, new tranny mount, and now the rear. Any suggestions?


This is not the my truck in my signature. An 89 mustang is the car in question if that makes a difference.

-Andy

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"The great proof of madness is the disproportion of one's designs to one's means." - Napoleon Bonaparte

Last edited by Holey Moley 64; Jan 21st, 09 at 3:28 PM.
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