Custom replacement gear shift knob for SM465 manual transmission (vintage square body GM truck)
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updated December 14, 2025

Description

PDF

Instead of mimicking the original shift knob, why not customize a replacement. This design is printable upright due to a cone base limiting overhang. Otherwise it's a 2" sphere. The bottom hole is hexagonal for inserting a 3/8-24 coupler nut. Hopefully that works with low infill. The common nut I found is 1-1/8" long for a 9/16" wrench. This 4-speed layout is unique to convey more information about the gears. Some may not find it intuitive. What do you think?

I haven't printed it yet (Dec 2025). I wanted to post the design online first. Then shop it around forums to get feedback from others. So this printable may get updated later. 

Model origin

The author marked this model as their own original creation.

License