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Old August 14th, 2024, 07:43 PM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
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Default Re: SM420 transmission rebuild with upgrades

Went ahead and assembled the transmission with new bearings and synchro rings. I got the rebuild kit from eBay and bought some new synchro's from Transmission Parts Distributors.
On the last transmission I did, the new synchro's definitely improved the shifting, making it quick and smooth to shift.

Last task it to pressure test for oil leaks (I hate oil leaks) and then give it a couple of coats of a clear rust preservative based on linseed oil to preserve the cast iron and all the markings.
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snazzypig (August 16th, 2024)