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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!
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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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