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Discussion Starter · #1 ·
Conflicting information among the T56 swap posts or people are using words interchangeably causing some confusion.

I have a T56 LT1 that I changed the input shaft to the LS1 shaft. MCleod 8-207 adapter plate is on the way. I have the Lakewood housing and mechanical linkage from the previous Muncie M-21 4 speed that has been in it for a few years that can be reused.

I have read that the LS1 input shaft is a bit shorter than the Muncie input shaft. Can someone clarify which of the following should be used in the swap? All three have been mentioned in t56 swap threads in the forums which is causing the confusion.

A. Extended Pilot Bushing
B. Extended Pilot Bearing
C. Extended Throwout Bearing

C - does not seem likely as the TOB already in use has been working for years and has little impact due to the change in overall length of the input shaft.

...and what part number should be used?

Any help is appreciated. Thanks.
 

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Conflicting information among the T56 swap posts or people are using words interchangeably causing some confusion.

I have a T56 LT1 that I changed the input shaft to the LS1 shaft. MCleod 8-207 adapter plate is on the way. I have the Lakewood housing and mechanical linkage from the previous Muncie M-21 4 speed that has been in it for a few years that can be reused.

I have read that the LS1 input shaft is a bit shorter than the Muncie input shaft. Can someone clarify which of the following should be used in the swap? All three have been mentioned in t56 swap threads in the forums which is causing the confusion.

A. Extended Pilot Bushing
B. Extended Pilot Bearing
C. Extended Throwout Bearing

C - does not seem likely as the TOB already in use has been working for years and has little impact due to the change in overall length of the input shaft.

...and what part number should be used?

Any help is appreciated. Thanks.
The LS1 T56 and the Muncie input shafts are actually about the same length. However, the 0.5" thick adapter plate makes the effective length of the LS1 T56 input shaft 0.5" shorter than the Muncie input shaft.

You want an extended pilot bushing (I'm not aware of an extended pilot bearing for the SBC/BBC).
 

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Premium Member
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Discussion Starter · #3 ·
Thanks for the quick reply.

I found the following when searching "GM Extended Pilot Bushing"

1. http://www.tickperformance.com/gm-extended-pilot-bushing-swap-applications/

2. http://www.mcleodracing.com/products/Pilot+Bushings.mcl
(I could not identify which one of these would be the correct size to order)

3. http://www.thegearbox.org/catalog/item/3838217/6239106.htm

I am not sure which on e is better quality metal or which one fits properly. Does anyone have the correct size and preferred vendor based on quality product?

Thanks,
 

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Gold Lifetime Member
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4,706 Posts
Thanks for the quick reply.

I found the following when searching "GM Extended Pilot Bushing"

1. http://www.tickperformance.com/gm-extended-pilot-bushing-swap-applications/

2. http://www.mcleodracing.com/products/Pilot+Bushings.mcl
(I could not identify which one of these would be the correct size to order)

3. http://www.thegearbox.org/catalog/item/3838217/6239106.htm

I am not sure which on e is better quality metal or which one fits properly. Does anyone have the correct size and preferred vendor based on quality product?

Thanks,
I've used the 1.094" pilot bushing from McLeod for over 25,000 miles with no issues. I would think either the 1.094" pilot bushing or bearing would be fine, depending on whether you're "old school" or "new school."

T56's are supposed to like the bearings better, but my experience was good with the bushing.
 

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Discussion Starter · #5 ·
Thanks Mkelcy. I have ordered one from Tick (GM Extended Bushing) and one from McLeod (Part# 8-1094-4) to see if there is any difference.

Also, when I looked up the McLeod part number at Summit, it comes up as a bearing with no mention of being "extended". It is not listed as a bushing which also helped create some of the initial confusion.

Has anyone ordered the part from Summit. Is it a bearing or a bushing? Is it extended like the other bushings mentioned?

Thanks.
 
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