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Old August 14th, 2024, 07:40 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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Prowbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the rough
Default Re: SM420 transmission rebuild with upgrades

The bushings of the 2nd and 3rd gears on the main shaft were pretty wore out. Decided to make my own bushings from a piece of bronze I scored at the local scrapyard.

The 2nd gear bushing was made with the correct OD to press it in, but left oversize on the ID. Pressed it in and turned out the ID to spec and redrilled the oil holes. I then cut oiling grooves on the mill to help oil flow into the bushing.

The 3rd gear bushing was more of a hassle, since it is pressed on the mainshaft. I first made a blank with the correct ID. I then pressed it on the mainshaft and turned it to the correct OD.
The bushing was removed and the oiling grooves were cut. I cut in 8 grooves instead of 10, it was easier to index.

All the clearances on the shaft are now according to the manual.
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