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Mod | | | Forums66 Topics128,078 Posts1,056,049 Members48,433 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Mar 2018 Posts: 139 'Bolter | | 'Bolter Joined: Mar 2018 Posts: 139 | Sort of a random question- what size nut will go on the gear shift lever on a sm420? I’m having trouble matching the pitch size and diameter to run a tap to clean the threads.
Last edited by Snowman51; 01/11/2024 9:23 PM. Reason: more detail
| | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | Could be 5/16-24 or maybe 3/8-24... it's been a while since I've checked one out. Mike B  | | | | | Joined: Sep 2009 Posts: 5,863 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,863 | 3/8-24 is the thread count for the shifter knob so that would be correct for the locking nut as well. 
Last edited by Gdads51; 01/12/2024 3:14 PM.
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Mar 2018 Posts: 139 'Bolter | | 'Bolter Joined: Mar 2018 Posts: 139 | Thanks. I’ll give that a try. | | | | | Joined: Mar 2018 Posts: 139 'Bolter | | 'Bolter Joined: Mar 2018 Posts: 139 | Worked like a charm! Thanks. | | | | | Joined: Jan 2022 Posts: 2,450 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,450 | I think you should return the knob and demand your money back
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Mar 2018 Posts: 139 'Bolter | | 'Bolter Joined: Mar 2018 Posts: 139 | Thanks Bill, but I’ll be perfectly happy with this one It looks great. Now if it would get a little warmer, I could work on replacing my clutch fork spring. Non-heated barns suck in the winter! | | | | | Joined: Feb 2004 Posts: 29,792 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,792 | Here's one that puts more of the thread into the shift knob where it belongs- - - -half the thickness of a regular nut: www.ebay.com/itm/231128874002?Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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