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Click on image for the lowdown. 
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7 members (Oswald, FAST55, Ponchogl, 2-Ton, Oldcaliforniakid, Hotrod Lincoln, Donf),
74
guests, and
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robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,042 Posts1,055,519 Members48,424 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2013 Posts: 25 New Guy | | New Guy Joined: Jan 2013 Posts: 25 | Can anyone tell me the original GM Part number for the 4
th gear synchro cone from the standard HD 4speed transmission | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Chrislon, Cone, clutch gear syncronizer - 4 speed transmission p/n 591603
Clutch, third and fourth speed - 4 speed transmission p/n 591429
hope that helps. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | 1948-58 Cone, clutch gear
1954 parts book 591603
1972 parts book 3667292 (part number change)
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | Wouldn't the 1972 be for a 465. In that GM switch from the 420 to the 465 in 68.
Larry
I don't own a vehicle that isn't old enough to drink.
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The number I gave from the 1972 parts book is for the 1948-58 SM420.
See the USA in your vintage Chevrolet! My Blog | | |
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