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pilot bushing VS pilot bearing??

 
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MrMike98
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Joined: 18 May 2010
Posts: 231
Location: Bremerton


PostPosted: Sun Aug 17, 2014 2:46 pm    Post subject: pilot bushing VS pilot bearing?? Reply with quote

when or why would you use a bushing vs a bearing.
my clutch kit came with both-which do i use?
L98-700r4 to-T56 conversion
thanks
Mike
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Twilightoptics
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Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Sun Aug 17, 2014 2:49 pm    Post subject: Reply with quote

Bushing every time.

Bearings chew up input shafts and are less forgiving on install.

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MrMike98
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Joined: 18 May 2010
Posts: 231
Location: Bremerton


PostPosted: Sun Aug 17, 2014 2:53 pm    Post subject: Reply with quote

thanks for the quick reply-

so thats why its chewed up. Sad

how much of the 1" length of the nose needs to be "INtact" for me to use it.
new input shaft? Sad
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QwkTrip
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Sun Aug 17, 2014 9:00 pm    Post subject: Reply with quote

RPM Industries will only use bearings. One of the best tranny shops in the nation. They actually told me to remove my new bushing. Careful install of bearing and trans is key to long life.
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aaron_sK
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Joined: 23 Jan 2006
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Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Sun Aug 17, 2014 9:11 pm    Post subject: Reply with quote

What is their logic for this, Jon?

A low clearance bearing installed in place of a bushing will never outlast said bushing, and when it inevitably fails it will require a full teardown of the trans to replace the input shaft.

You use a bearing is when the crankshaft has been designed for a bearing to be installed, and therefore has a large enough bore that you can have a sheath around the input shaft.
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QwkTrip
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1989 Pontiac Firebird

PostPosted: Sun Aug 17, 2014 10:44 pm    Post subject: Reply with quote

The advice they gave me is LS1 engine. I didn't think about Gen II being different. Is it different?
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chevymad
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Joined: 11 Jan 2004
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1987 Pontiac Formula

PostPosted: Mon Aug 18, 2014 6:20 am    Post subject: Reply with quote

Alot of transmission shops will say the bearing is better. The bearing will not have the same slop in it that a bushing will get. At least until it fails. They say this is better for the internals of the trans and that it will shift better.

On the other hand I don't usually see the internals damaged as often as the input shaft trashed because the bearing failed.

I agree with Paul on this one and would use a bushing myself.
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Twilightoptics
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1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Aug 18, 2014 4:00 pm    Post subject: Reply with quote

LS1 T56 transmission has the same snout diameter as a T5 does.

You'll need to post a picture of the damage to the shaft. Likely best to replace it to be safe. That is a complete transmission tear down though.

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MrMike98
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Location: Bremerton


PostPosted: Tue Aug 19, 2014 8:42 am    Post subject: Reply with quote

i thought that you only had to remove the "upper" mid-plate, slide out the shaft, install new shaft, clean reseal mid-plate......everything else stays in the case?? what do you think of this shaft end.??
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aaron_sK
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Joined: 23 Jan 2006
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Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Tue Aug 19, 2014 5:14 pm    Post subject: Reply with quote

MrMike98 wrote:
i thought that you only had to remove the "upper" mid-plate, slide out the shaft, install new shaft, clean reseal mid-plate......everything else stays in the case???


But how do you feel about end play? Wink

I don't see any issue at all in the pic you posted. I'd run some emery cloth around it and go.
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