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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old April 18th, 2023, 03:47 AM
Mulana Mulana is offline
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Default Transmission Pilot Bearing Availability?

Hello: I am in need of a transmission pilot bearing for my 432 V6 and 5-speed. Since I could not easily find a 478 flywheel, I had a 401 flywheel balanced to work on my 432. I went to my local parts house to find a needle bearing or bushing, but I am not having any luck with the dimensions I gave them. Anyone have a source for this or will I have to get it made? The dimensions I have are; 0.985 ID, 1.355 ID, and 0.755 in length.

Thanks in advance, Jim Mx.
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  #2  
Old April 19th, 2023, 09:23 PM
Prowbar Prowbar is offline
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Default Re: Transmission Pilot Bearing Availability?

Hello Jim,

Are you sure the OD is 1.355" and not 1.378"? To my knowledge, all bearings used in these trucks are of a metric size.

1.378" is 35mm
.985" is 25mm
.755" is about 19mm

I can find bronze bushings with a 35mm OD and 25mm ID. These can be easily machined to the right length.

For my 478 flywheel, it had a rather larger pilot bearing for a large truck trans. Since I went with the SM420 I made a pilot bearing conversion sleeve to accept a standard 6202 bearing, used on the 305 flywheel. That sleeve was pressed into the flywheel.

You're using the big truck trans in your pickup project?

Last edited by Prowbar; April 20th, 2023 at 05:21 AM.
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Old April 20th, 2023, 03:43 AM
Mulana Mulana is offline
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Default Re: Transmission Pilot Bearing Availability?

Thanks for the quick reply. I am somewhat new and did not know the bearings are metric. I could have mismeasured the bore of the flywheel. Time to head for the parts house and see what they can come up with. Yes, I am using a big 5sp for my '62 1 ton pickup.
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Old April 20th, 2023, 05:20 AM
Prowbar Prowbar is offline
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Default Re: Transmission Pilot Bearing Availability?

I said 1.375" but meant to say 1.378".
1.378" x 25.40 = 35,0012mm
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