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Old January 3rd, 2018, 01:50 AM
bigblockv6 bigblockv6 is offline
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Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
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Default Re: 478 Trans options / bellhousing options

You would be better off using the 5 speed from the 478 engine. Going to a transmission from a lighter duty truck would involve the light duty bellhousing and a flywheel from a 379 V6 since the 478 flywheel has 8 mounting bolts to the crankshaft and external balancing on the flywheel as well. only the 379 would have the correct smaller diameter flywheel that's compatible with the 478, otherwise a custom flywheel would be necessary but would also need to be balanced with the whole rotating assembly and that's why ended up having done to install my 478 in my 68 K2500 pickup. As far as a lighter duty automatic, Bendtsens transmission adapters may be able to fabricate a custom flexplate with ring gear but not sure if they could put the correct offset weight, I know they have made setups for the 702 V12 that has a 10 bolt flywheel but there is no external balancing on the V12. Go to www.transmissionadapters.com. Included in this post is a pic of my custom built 478 flywheel.
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